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rk2adaptive.cu
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rk2adaptive.cu
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/**
* @author Christoph Schaefer [email protected] and Thomas I. Maindl
*
* @section LICENSE
* Copyright (c) 2019 Christoph Schaefer
*
* This file is part of miluphcuda.
*
* miluphcuda is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* miluphcuda is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with miluphcuda. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "rk2adaptive.h"
#include "miluph.h"
#include "timeintegration.h"
#include "parameter.h"
#include "memory_handling.h"
#include "rhs.h"
#include "pressure.h"
#include "boundary.h"
extern __device__ double endTimeD, currentTimeD;
extern __device__ double substep_currentTimeD;
extern __device__ double dt;
extern __device__ double dtmax;
extern __device__ int isRelaxed;
extern __device__ int blockCount;
extern __device__ int errorSmallEnough;
extern __device__ double dtNewErrorCheck;
extern __device__ double dtNewAlphaCheck;
extern __device__ double maxPosAbsError;
extern __constant__ double b21;
extern __constant__ double b31;
extern __constant__ double b32;
extern __constant__ double c1;
extern __constant__ double c2;
extern __constant__ double c3;
extern __device__ double maxVelAbsError;
extern __device__ double maxDensityAbsError;
extern __device__ double maxEnergyAbsError;
extern __device__ double maxPressureAbsChange;
extern __device__ double maxDamageTimeStep;
extern __device__ double maxalphaDiff;
extern __constant__ double safety;
__constant__ __device__ double rk_epsrel_d;
extern double L_ini;
__global__ void limitTimestep(double *forcesPerBlock , double *courantPerBlock)
{
__shared__ double sharedForces[NUM_THREADS_LIMITTIMESTEP];
__shared__ double sharedCourant[NUM_THREADS_LIMITTIMESTEP];
int i, j, k, m;
double forces = 1e100, courant = 1e100;
double temp;
double sml;
double ax;
#if DIM > 1
double ay;
#endif
#if DIM == 3
double az;
#endif
for (i = threadIdx.x + blockIdx.x * blockDim.x; i < numParticles; i+= blockDim.x * gridDim.x) {
ax = p.ax[i];
#if DIM > 1
ay = p.ay[i];
#endif
#if DIM == 3
az = p.az[i];
#endif
temp = ax*ax;
#if DIM > 1
temp += ay*ay;
#endif
#if DIM == 3
temp += az*az;
#endif
sml = p.h[i];
if (temp > 0) {
temp = sqrt(sml / sqrt(temp));
forces = min(forces, temp);
}
temp = sml / p.cs[i];
courant = min(courant, temp);
}
i = threadIdx.x;
sharedForces[i] = forces;
sharedCourant[i] = courant;
for (j = NUM_THREADS_LIMITTIMESTEP / 2; j > 0; j /= 2) {
__syncthreads();
if (i < j) {
k = i + j;
sharedForces[i] = forces = min(forces, sharedForces[k]);
sharedCourant[i] = courant = min(courant, sharedCourant[k]);
}
}
// write block result to global memory
if (i == 0) {
k = blockIdx.x;
forcesPerBlock[k] = forces;
courantPerBlock[k] = courant;
m = gridDim.x - 1;
if (m == atomicInc((unsigned int *)&blockCount, m)) {
// last block, so combine all block results
for (j = 0; j <= m; j++) {
forces = min(forces, forcesPerBlock[j]);
courant = min(courant, courantPerBlock[j]);
}
// set new timestep
dt = min(COURANT*courant, forces*0.2);
dt = min(dt, endTimeD - currentTimeD);
if (dt > dtmax) {
printf("<limittimestep> timestep %g is larger than maximum timestep %g, reducing to %g\n", dt, dtmax, dtmax);
dt = dtmax;
}
// reset block count
blockCount = 0;
}
}
}
/*
the runge-kutta 2nd order integrator with adaptive timestep
see cuda-paper for details
*/
void rk2Adaptive()
{
int rkstep;
int errorSmallEnough_host;
double dtNewErrorCheck_host = 0.0;
#if PALPHA_POROSITY
double dtNewAlphaCheck_host = -1.0;
double dt_alphanew = 0;
double dt_alphaold = 0;
#endif
double *maxPosAbsErrorPerBlock;
double *maxVelAbsErrorPerBlock;
#if FRAGMENTATION
double dt_damagenew = 0;
double dt_damageold = 0;
#endif
/* first of all copy the rk_epsrel to the device */
cudaVerify(cudaMemcpyToSymbol(rk_epsrel_d, ¶m.rk_epsrel, sizeof(double)));
// allocate memory for runge kutta second order
cudaVerify(cudaMalloc((void**)&maxPosAbsErrorPerBlock, sizeof(double)*numberOfMultiprocessors));
cudaVerify(cudaMalloc((void**)&maxVelAbsErrorPerBlock, sizeof(double)*numberOfMultiprocessors));
#if INTEGRATE_DENSITY
double *maxDensityAbsErrorPerBlock;
cudaVerify(cudaMalloc((void**)&maxDensityAbsErrorPerBlock , sizeof(double)*numberOfMultiprocessors));
#endif
#if INTEGRATE_ENERGY
double *maxEnergyAbsErrorPerBlock;
cudaVerify(cudaMalloc((void**)&maxEnergyAbsErrorPerBlock, sizeof(double)*numberOfMultiprocessors));
#endif
#if FRAGMENTATION
double *maxDamageTimeStepPerBlock;
cudaVerify(cudaMalloc((void**)&maxDamageTimeStepPerBlock, sizeof(double)*numberOfMultiprocessors));
#endif
#if PALPHA_POROSITY
double *maxalphaDiffPerBlock;
cudaVerify(cudaMalloc((void**)&maxalphaDiffPerBlock, sizeof(double)*numberOfMultiprocessors));
double *maxPressureAbsChangePerBlock;
cudaVerify(cudaMalloc((void**)&maxPressureAbsChangePerBlock, sizeof(double)*numberOfMultiprocessors));
#endif
// alloc mem for multiple rhs and copy immutables
int allocate_immutables = 0;
for (rkstep = 0; rkstep < 3; rkstep++) {
allocate_particles_memory(&rk_device[rkstep], allocate_immutables);
copy_particles_immutables_device_to_device(&rk_device[rkstep], &p_device);
#if GRAVITATING_POINT_MASSES
allocate_pointmass_memory(&rk_pointmass_device[rkstep], allocate_immutables);
copy_pointmass_immutables_device_to_device(&rk_pointmass_device[rkstep], &pointmass_device);
#endif
}
// set the symbol pointers
cudaVerify(cudaMemcpyToSymbol(rk, &rk_device, sizeof(struct Particle) * 3));
#if GRAVITATING_POINT_MASSES
cudaVerify(cudaMemcpyToSymbol(rk_pointmass, &rk_pointmass_device, sizeof(struct Pointmass) * 3));
#endif
int lastTimestep = startTimestep + numberOfTimesteps;
int timestep;
int nsteps_cnt = 0;
double dt_host_old = timePerStep;
currentTime = startTime;
double endTime = startTime;
double substep_currentTime;
cudaVerify(cudaDeviceSynchronize());
cudaVerify(cudaMemcpyToSymbol(currentTimeD, ¤tTime, sizeof(double)));
for (timestep = startTimestep; timestep < lastTimestep; timestep++) {
fprintf(stderr, "calculating step %d\n", timestep);
fprintf(stdout, "\nstep %d / %d\n", timestep, lastTimestep);
endTime += timePerStep;
fprintf(stdout, "currenttime: %e \t endtime: %e\n", currentTime, endTime);
if (nsteps_cnt == 0) {
if (timePerStep > param.maxtimestep) {
cudaVerify(cudaMemcpyToSymbol(dt, ¶m.maxtimestep, sizeof(double)));
dt_host_old = param.maxtimestep;
} else {
cudaVerify(cudaMemcpyToSymbol(dt, &timePerStep, sizeof(double)));
}
if (param.verbose) fprintf(stdout, "Starting with timestep %.17e\n", dt_host_old);
} else {
cudaVerify(cudaMemcpyToSymbol(dt, &dt_host_old, sizeof(double)));
dt_host = dt_host_old;
if (param.verbose) fprintf(stdout, "Continuing with timestep %.17e\n", dt_host_old);
}
nsteps_cnt++;
cudaVerify(cudaMemcpyToSymbol(endTimeD, &endTime, sizeof(double)));
// checking for changes in angular momentum
if (param.angular_momentum_check > 0) {
double L_current = calculate_angular_momentum();
double L_change_relative;
if (L_ini > 0) {
L_change_relative = fabs((L_ini - L_current)/L_ini);
}
if (param.verbose) {
fprintf(stdout, "Checking angular momentum conservation.\n");
fprintf(stdout, "Initial angular momentum: %.17e\n", L_ini);
fprintf(stdout, "Current angular momentum: %.17e\n", L_current);
fprintf(stdout, "Relative change: %.17e\n", L_change_relative);
}
if (L_change_relative > param.angular_momentum_check) {
fprintf(stderr, "Conservation of angular momentum violated. Exiting.\n");
exit(111);
}
}
while (currentTime < endTime) {
// get the correct time
substep_currentTime = currentTime;
cudaVerify(cudaMemcpyToSymbol(substep_currentTimeD, &substep_currentTime, sizeof(double)));
cudaVerify(cudaDeviceSynchronize());
// copy particle data to first runge kutta step
copy_particles_variables_device_to_device(&rk_device[RKFIRST], &p_device);
cudaVerify(cudaDeviceSynchronize());
#if GRAVITATING_POINT_MASSES
copy_pointmass_variables_device_to_device(&rk_pointmass_device[RKFIRST], &pointmass_device);
cudaVerify(cudaDeviceSynchronize());
#endif
// calculate first right hand side with rk[RKFIRST]_device
cudaVerify(cudaMemcpyToSymbol(p, &rk_device[RKFIRST], sizeof(struct Particle)));
cudaVerify(cudaMemcpyToSymbol(pointmass, &rk_pointmass_device[RKFIRST], sizeof(struct Pointmass)));
rightHandSide();
cudaVerify(cudaDeviceSynchronize());
#if FRAGMENTATION
cudaVerify(cudaMemcpyFromSymbol(&dt_damageold, dt, sizeof(double)));
/* add function for best timestep with fragmentation here */
cudaVerifyKernel((damageMaxTimeStep<<<numberOfMultiprocessors, NUM_THREADS_ERRORCHECK>>>(
maxDamageTimeStepPerBlock
)));
cudaVerify(cudaMemcpyFromSymbol(&dt_damagenew, dt, sizeof(double)));
if (dt_damagenew < dt_damageold && param.verbose) {
fprintf(stdout, "current time: %e \t\t reducing timestep due to damage evolution from suggested time step %g to %g\n", currentTime, dt_damageold, dt_damagenew);
dt_host = dt_damagenew;
dt_host_old = dt_host;
}
#endif
// remember values of first step
copy_particles_variables_device_to_device(&rk_device[RKSTART], &rk_device[RKFIRST]);
copy_particles_derivatives_device_to_device(&rk_device[RKSTART], &rk_device[RKFIRST]);
#if GRAVITATING_POINT_MASSES
copy_pointmass_variables_device_to_device(&rk_pointmass_device[RKSTART], &rk_pointmass_device[RKFIRST]);
copy_pointmass_derivatives_device_to_device(&rk_pointmass_device[RKSTART], &rk_pointmass_device[RKFIRST]);
#endif
// remember accels due to gravity
if (param.selfgravity) {
copy_gravitational_accels_device_to_device(&rk_device[RKSTART], &rk_device[RKFIRST]);
}
#define SMALLEST_DT_ALLOWED 1e-30
// integrate with adaptive timestep
while (TRUE) {
cudaVerify(cudaDeviceSynchronize());
// set rk[RKFIRST] variables
cudaVerifyKernel((integrateFirstStep<<<numberOfMultiprocessors, NUM_THREADS_RK2_INTEGRATE_STEP>>>()));
cudaVerify(cudaDeviceSynchronize());
// get derivatives for second step
// this happens at t = t0 + h/2
cudaVerify(cudaMemcpyFromSymbol(&dt_host, dt, sizeof(double)));
if (dt_host < SMALLEST_DT_ALLOWED) {
fprintf(stderr, "Timestep is smaller than SMALLEST_DT_ALLOWED. Stopping here.\n");
exit(1);
}
substep_currentTime = currentTime + dt_host*0.5;
cudaVerify(cudaMemcpyToSymbol(substep_currentTimeD, &substep_currentTime, sizeof(double)));
cudaVerify(cudaMemcpyToSymbol(p, &rk_device[RKFIRST], sizeof(struct Particle)));
#if GRAVITATING_POINT_MASSES
cudaVerify(cudaMemcpyToSymbol(pointmass, &rk_pointmass_device[RKFIRST], sizeof(struct Pointmass)));
#endif
rightHandSide();
cudaVerify(cudaDeviceSynchronize());
// integrate second step
cudaVerifyKernel((integrateSecondStep<<<numberOfMultiprocessors, NUM_THREADS_RK2_INTEGRATE_STEP>>>()));
cudaVerify(cudaDeviceSynchronize());
if (param.selfgravity) {
copy_gravitational_accels_device_to_device(&rk_device[RKSECOND], &rk_device[RKFIRST]);
}
// get derivatives for the 3rd (and last) step
// this happens at t = t0 + h
cudaVerify(cudaMemcpyToSymbol(p, &rk_device[RKSECOND], sizeof(struct Particle)));
#if GRAVITATING_POINT_MASSES
cudaVerify(cudaMemcpyToSymbol(pointmass, &rk_pointmass_device[RKSECOND], sizeof(struct Pointmass)));
#endif
substep_currentTime = currentTime + dt_host;
cudaVerify(cudaMemcpyToSymbol(substep_currentTimeD, &substep_currentTime, sizeof(double)));
rightHandSide();
cudaVerify(cudaDeviceSynchronize());
// integrate third step
cudaVerify(cudaMemcpyToSymbol(p, &p_device, sizeof(struct Particle)));
#if GRAVITATING_POINT_MASSES
cudaVerify(cudaMemcpyToSymbol(pointmass, &pointmass_device, sizeof(struct Pointmass)));
#endif
cudaVerifyKernel((integrateThirdStep<<<numberOfMultiprocessors, NUM_THREADS_RK2_INTEGRATE_STEP>>>()));
cudaVerify(cudaDeviceSynchronize());
// calculate errors
// following Stephen Oxley 1999, Modelling the Capture Theory for the
// Origin of Planetary Systems
cudaVerifyKernel((checkError<<<numberOfMultiprocessors, NUM_THREADS_ERRORCHECK>>>(
maxPosAbsErrorPerBlock, maxVelAbsErrorPerBlock
#if INTEGRATE_DENSITY
, maxDensityAbsErrorPerBlock
#endif
#if INTEGRATE_ENERGY
, maxEnergyAbsErrorPerBlock
#endif
#if PALPHA_POROSITY
, maxPressureAbsChangePerBlock
#endif
)));
/* get info about the quality of the time step: if errorSmallEnough is TRUE, then
the integration is successful and the timestep size is raised. if errorSmallEnough
is FALSE, the timestep size is lowered and the step is repeated */
cudaVerify(cudaDeviceSynchronize());
cudaVerify(cudaMemcpyFromSymbol(&dtNewErrorCheck_host, dtNewErrorCheck, sizeof(double)));
cudaVerify(cudaMemcpyFromSymbol(&errorSmallEnough_host, errorSmallEnough, sizeof(int)));
#if PALPHA_POROSITY
/* special checks for the convergence of the p(alpha) crush curve stuff */
if (errorSmallEnough_host) {
dt_alphaold = dt_host;
//cudaVerify(cudaDeviceSynchronize());
//cudaVerify(cudaMemcpyFromSymbol(&dt_alphaold, dtNewErrorCheck, sizeof(double)));
/* checking if the distention change is within the set limit */
cudaVerifyKernel((alphaMaxTimeStep<<<numberOfMultiprocessors, NUM_THREADS_ERRORCHECK>>>(
maxalphaDiffPerBlock
)));
cudaVerify(cudaMemcpyFromSymbol(&dt_alphanew, dtNewAlphaCheck, sizeof(double)));
if (dt_alphanew < dt_alphaold && param.verbose && dt_alphanew > 0) {
fprintf(stdout, "current time step: %e is too large for distention. lowering it to %e\n", dt_alphaold, dt_alphanew);
}
}
dtNewAlphaCheck_host = -1.0;
cudaVerify(cudaDeviceSynchronize());
cudaVerify(cudaMemcpyFromSymbol(&dtNewAlphaCheck_host, dtNewAlphaCheck, sizeof(double)));
cudaVerify(cudaMemcpyFromSymbol(&errorSmallEnough_host, errorSmallEnough, sizeof(int)));
#endif
/* last time step was okay, forward time and continue with new time step size */
if (errorSmallEnough_host) {
currentTime += dt_host;
cudaVerifyKernel((BoundaryConditionsAfterIntegratorStep<<<numberOfMultiprocessors, NUM_THREADS_ERRORCHECK>>>(interactions)));
}
double errPos, errVel, errDensity = 0;
cudaVerify(cudaMemcpyFromSymbol(&errPos, maxPosAbsError, sizeof(double)));
cudaVerify(cudaMemcpyFromSymbol(&errVel, maxVelAbsError, sizeof(double)));
#if INTEGRATE_DENSITY
cudaVerify(cudaMemcpyFromSymbol(&errDensity, maxDensityAbsError, sizeof(double)));
#endif
cudaVerify(cudaDeviceSynchronize());
if (param.verbose) printf("total relative max error: %g (locations: %e, velocities: %e, density: %e) with timestep %e\n", max(max(errPos, errVel), errDensity) / param.rk_epsrel, errPos, errVel, errDensity, dt_host);
#if PALPHA_POROSITY
if (param.verbose)
printf("Current time: %g \t dt: %g \t dtNewErrorCheck: %g \t dtNewAlphaCheck: %g \n", currentTime, dt_host, dtNewErrorCheck_host, dtNewAlphaCheck_host);
#endif
/* set new time step for next step */
#if PALPHA_POROSITY
dt_host_old = dt_host;
if (dtNewAlphaCheck_host <= 0) {
dt_host = dtNewErrorCheck_host;
} else {
dt_host = min(dtNewErrorCheck_host, dtNewAlphaCheck_host);
}
#else
dt_host_old = dt_host;
dt_host = dtNewErrorCheck_host;
#endif
/* check if time step is too large */
/* and lower if necessary */
if (currentTime + dt_host > endTime) {
dt_host_old = dt_host;
dt_host = endTime - currentTime;
}
cudaVerify(cudaDeviceSynchronize());
/* tell the gpu the new time step size and the current time */
cudaVerify(cudaMemcpyToSymbol(currentTimeD, ¤tTime, sizeof(double)));
cudaVerify(cudaMemcpyToSymbol(dt, &dt_host, sizeof(double)));
if (errorSmallEnough_host) {
cudaVerify(cudaMemcpyFromSymbol(¤tTime, currentTimeD, sizeof(double)));
if (param.verbose) {
fprintf(stdout, "last error small enough: current time %.17e with timestep %.17e new timestep %.17e, time to next output is %.17e \n", currentTime, dt_host_old, dt_host, endTime-currentTime);
}
break; // break while(true) -> continue with next timestep
} else {
// integration not successful, dt has been lowered, try another round
if (param.verbose) {
fprintf(stdout, "error too large >>>>>>>>>>>> current time: %e timestep lowered to %e\n", currentTime, dt_host);
}
// copy back the initial values of particles
copy_particles_variables_device_to_device(&rk_device[RKFIRST], &rk_device[RKSTART]);
copy_particles_derivatives_device_to_device(&rk_device[RKFIRST], &rk_device[RKSTART]);
#if GRAVITATING_POINT_MASSES
copy_pointmass_variables_device_to_device(&rk_pointmass_device[RKFIRST], &rk_pointmass_device[RKSTART]);
copy_pointmass_derivatives_device_to_device(&rk_pointmass_device[RKFIRST], &rk_pointmass_device[RKSTART]);
#endif
cudaVerify(cudaDeviceSynchronize());
}
} // loop until error small enough
} // current time < end time loop
// write results
#if FRAGMENTATION
cudaVerify(cudaDeviceSynchronize());
cudaVerifyKernel((damageLimit<<<numberOfMultiprocessors*4, NUM_THREADS_PC_INTEGRATOR>>>()));
cudaVerify(cudaDeviceSynchronize());
#endif
copyToHostAndWriteToFile(timestep, lastTimestep);
} // timestep loop
// free memory
// free mem of rksteps
int free_immutables = 0;
for (rkstep = 0; rkstep < 3; rkstep++) {
free_particles_memory(&rk_device[rkstep], free_immutables);
#if GRAVITATING_POINT_MASSES
free_pointmass_memory(&rk_pointmass_device[rkstep], free_immutables);
#endif
}
cudaVerify(cudaFree(maxPosAbsErrorPerBlock));
cudaVerify(cudaFree(maxVelAbsErrorPerBlock));
#if FRAGMENTATION
cudaVerify(cudaFree(maxDamageTimeStepPerBlock));
#endif
#if INTEGRATE_ENERGY
cudaVerify(cudaFree(maxEnergyAbsErrorPerBlock));
#endif
#if INTEGRATE_DENSITY
cudaVerify(cudaFree(maxDensityAbsErrorPerBlock));
#endif
#if PALPHA_POROSITY
cudaVerify(cudaFree(maxalphaDiffPerBlock));
#endif
}
__global__ void integrateFirstStep(void)
{
int i;
#if GRAVITATING_POINT_MASSES
// loop for the point masses
for (i = threadIdx.x + blockIdx.x * blockDim.x; i < numPointmasses; i+= blockDim.x * gridDim.x) {
rk_pointmass[RKFIRST].x[i] = rk_pointmass[RKSTART].x[i] + dt * b21 * rk_pointmass[RKSTART].vx[i];
#if DIM > 1
rk_pointmass[RKFIRST].y[i] = rk_pointmass[RKSTART].y[i] + dt * b21 * rk_pointmass[RKSTART].vy[i];
#endif
#if DIM > 2
rk_pointmass[RKFIRST].z[i] = rk_pointmass[RKSTART].z[i] + dt * b21 * rk_pointmass[RKSTART].vz[i];
#endif
rk_pointmass[RKFIRST].vx[i] = rk_pointmass[RKSTART].vx[i] + dt * b21 * rk_pointmass[RKSTART].ax[i];
#if DIM > 1
rk_pointmass[RKFIRST].vy[i] = rk_pointmass[RKSTART].vy[i] + dt * b21 * rk_pointmass[RKSTART].ay[i];
#endif
#if DIM > 2
rk_pointmass[RKFIRST].vz[i] = rk_pointmass[RKSTART].vz[i] + dt * b21 * rk_pointmass[RKSTART].az[i];
#endif
}
#endif // GRAVITATING_POINT_MASSES
// loop for the particles
for (i = threadIdx.x + blockIdx.x * blockDim.x; i < numParticles; i+= blockDim.x * gridDim.x) {
//printf("START: vx: %g \t %g :dxdt \t\t\t vy: %g \t %g :dydt\n", velxStart[i], dxdtStart[i], velyStart[i], dydtStart[i]);
#if INTEGRATE_DENSITY
rk[RKFIRST].rho[i] = rk[RKSTART].rho[i] + dt * b21 * rk[RKSTART].drhodt[i];
#endif
#if INTEGRATE_SML
rk[RKFIRST].h[i] = rk[RKSTART].h[i] + dt * b21 * rk[RKSTART].dhdt[i];
#else
rk[RKFIRST].h[i] = rk[RKSTART].h[i];
#endif
#if INTEGRATE_ENERGY
rk[RKFIRST].e[i] = rk[RKSTART].e[i] + dt * b21 * rk[RKSTART].dedt[i];
#endif
#if FRAGMENTATION
rk[RKFIRST].d[i] = rk[RKSTART].d[i] + dt * b21 * rk[RKSTART].dddt[i];
rk[RKFIRST].numActiveFlaws[i] = rk[RKSTART].numActiveFlaws[i];
#if PALPHA_POROSITY
rk[RKFIRST].damage_porjutzi[i] = rk[RKSTART].damage_porjutzi[i] + dt * b21 * rk[RKSTART].ddamage_porjutzidt[i];
#endif
#endif
#if INVISCID_SPH
rk[RKFIRST].beta[i] = rk[RKSTART].beta[i] + dt * b21 * rk[RKSTART].dbetadt[i];
#endif
#if SOLID
int j, k;
for (j = 0; j < DIM; j++) {
for (k = 0; k < DIM; k++) {
rk[RKFIRST].S[stressIndex(i,j,k)] = rk[RKSTART].S[stressIndex(i,j,k)] + dt * b21 * rk[RKSTART].dSdt[stressIndex(i,j,k)];
}
}
#endif
#if JC_PLASTICITY
rk[RKFIRST].ep[i] = rk[RKSTART].ep[i] + dt * b21 * rk[RKSTART].edotp[i];
rk[RKFIRST].T[i] = rk[RKSTART].T[i] + dt * b21 * rk[RKSTART].dTdt[i];
#endif
#if PALPHA_POROSITY
rk[RKFIRST].alpha_jutzi[i] = rk[RKSTART].alpha_jutzi[i] + dt * b21 * rk[RKSTART].dalphadt[i];
// rk[RKFIRST].p is the pressure at the begin of the new timestep
// this pressure has to be compared to the pressure at the end of the timestep
rk[RKFIRST].pold[i] = rk[RKFIRST].p[i];
#endif
#if SIRONO_POROSITY
rk[RKFIRST].rho_0prime[i] = rk[RKSTART].rho_0prime[i];
rk[RKFIRST].rho_c_plus[i] = rk[RKSTART].rho_c_plus[i];
rk[RKFIRST].rho_c_minus[i] = rk[RKSTART].rho_c_minus[i];
rk[RKFIRST].compressive_strength[i] = rk[RKSTART].compressive_strength[i];
rk[RKFIRST].tensile_strength[i] = rk[RKSTART].tensile_strength[i];
rk[RKFIRST].shear_strength[i] = rk[RKSTART].shear_strength[i];
rk[RKFIRST].K[i] = rk[RKSTART].K[i];
rk[RKFIRST].flag_rho_0prime[i] = rk[RKSTART].flag_rho_0prime[i];
rk[RKFIRST].flag_plastic[i] = rk[RKSTART].flag_plastic[i];
#endif
#if EPSALPHA_POROSITY
rk[RKFIRST].alpha_epspor[i] = rk[RKSTART].alpha_epspor[i] + dt * b21 * rk[RKSTART].dalpha_epspordt[i];
rk[RKFIRST].epsilon_v[i] = rk[RKSTART].epsilon_v[i] + dt * b21 * rk[RKSTART].depsilon_vdt[i];
#endif
rk[RKFIRST].x[i] = rk[RKSTART].x[i] + dt * b21 * rk[RKSTART].dxdt[i];
#if DIM > 1
rk[RKFIRST].y[i] = rk[RKSTART].y[i] + dt * b21 * rk[RKSTART].dydt[i];
#endif
#if DIM > 2
rk[RKFIRST].z[i] = rk[RKSTART].z[i] + dt * b21 * rk[RKSTART].dzdt[i];
#endif
rk[RKFIRST].vx[i] = rk[RKSTART].vx[i] + dt * b21 * rk[RKSTART].ax[i];
#if DIM > 1
rk[RKFIRST].vy[i] = rk[RKSTART].vy[i] + dt * b21 * rk[RKSTART].ay[i];
#endif
#if DIM > 2
rk[RKFIRST].vz[i] = rk[RKSTART].vz[i] + dt * b21 * rk[RKSTART].az[i];
#endif
}
}
__global__ void integrateSecondStep(void)
{
int i;
#if GRAVITATING_POINT_MASSES
// loop for pointmasses
for (i = threadIdx.x + blockIdx.x * blockDim.x; i < numPointmasses; i+= blockDim.x * gridDim.x) {
rk_pointmass[RKSECOND].vx[i] = rk_pointmass[RKSTART].vx[i] + dt * (b31 * rk_pointmass[RKSTART].ax[i] + b32 * rk_pointmass[RKFIRST].ax[i]);
#if DIM > 1
rk_pointmass[RKSECOND].vy[i] = rk_pointmass[RKSTART].vy[i] + dt * (b31 * rk_pointmass[RKSTART].ay[i] + b32 * rk_pointmass[RKFIRST].ay[i]);
#endif
#if DIM == 3
rk_pointmass[RKSECOND].vz[i] = rk_pointmass[RKSTART].vz[i] + dt * (b31 * rk_pointmass[RKSTART].az[i] + b32 * rk_pointmass[RKFIRST].az[i]);
#endif
rk_pointmass[RKSECOND].x[i] = rk_pointmass[RKSTART].x[i] + dt * (b31 * rk_pointmass[RKSTART].vx[i] + b32 * rk_pointmass[RKFIRST].vx[i]);
#if DIM > 1
rk_pointmass[RKSECOND].y[i] = rk_pointmass[RKSTART].y[i] + dt * (b31 * rk_pointmass[RKSTART].vy[i] + b32 * rk_pointmass[RKFIRST].vy[i]);
#endif
#if DIM == 3
rk_pointmass[RKSECOND].z[i] = rk_pointmass[RKSTART].z[i] + dt * (b31 * rk_pointmass[RKSTART].vz[i] + b32 * rk_pointmass[RKFIRST].vz[i]);
#endif
}
#endif // GRAVITATING_POINT_MASSES
// loop for particles
for (i = threadIdx.x + blockIdx.x * blockDim.x; i < numParticles; i+= blockDim.x * gridDim.x) {
#if INTEGRATE_DENSITY
rk[RKSECOND].rho[i] = rk[RKSTART].rho[i] + dt * (b31 * rk[RKSTART].drhodt[i] + b32 * rk[RKFIRST].drhodt[i]);
#endif
#if INTEGRATE_SML
rk[RKSECOND].h[i] = rk[RKSTART].h[i] + dt * (b31 * rk[RKSTART].dhdt[i] + b32 * rk[RKFIRST].dhdt[i]);
#else
rk[RKSECOND].h[i] = rk[RKSTART].h[i];
#endif
#if INTEGRATE_ENERGY
rk[RKSECOND].e[i] = rk[RKSTART].e[i] + dt * (b31 * rk[RKSTART].dedt[i] + b32 * rk[RKFIRST].dedt[i]);
#endif
#if FRAGMENTATION
rk[RKSECOND].d[i] = rk[RKSTART].d[i] + dt * (b31 * rk[RKSTART].dddt[i] + b32 * rk[RKFIRST].dddt[i]);
rk[RKSECOND].numActiveFlaws[i] = rk[RKFIRST].numActiveFlaws[i];
#if PALPHA_POROSITY
rk[RKSECOND].damage_porjutzi[i] = rk[RKSTART].damage_porjutzi[i] + dt * (b31 * rk[RKSTART].ddamage_porjutzidt[i] + b32 * rk[RKFIRST].ddamage_porjutzidt[i]);
#endif
#endif
#if JC_PLASTICITY
rk[RKSECOND].ep[i] = rk[RKSTART].ep[i] + dt * (b31 * rk[RKSTART].edotp[i] + b32 * rk[RKFIRST].edotp[i]);
rk[RKSECOND].T[i] = rk[RKSTART].T[i] + dt * (b31 * rk[RKSTART].dTdt[i] + b32 * rk[RKFIRST].dTdt[i]);
#endif
#if PALPHA_POROSITY
rk[RKSECOND].alpha_jutzi[i] = rk[RKSTART].alpha_jutzi[i] + dt * (b31 * rk[RKSTART].dalphadt[i] + b32 * rk[RKFIRST].dalphadt[i]);
rk[RKSECOND].pold[i] = rk[RKFIRST].pold[i];
#endif
#if SIRONO_POROSITY
rk[RKSECOND].rho_0prime[i] = rk[RKFIRST].rho_0prime[i];
rk[RKSECOND].rho_c_plus[i] = rk[RKFIRST].rho_c_plus[i];
rk[RKSECOND].rho_c_minus[i] = rk[RKFIRST].rho_c_minus[i];
rk[RKSECOND].compressive_strength[i] = rk[RKFIRST].compressive_strength[i];
rk[RKSECOND].tensile_strength[i] = rk[RKFIRST].tensile_strength[i];
rk[RKSECOND].shear_strength[i] = rk[RKFIRST].shear_strength[i];
rk[RKSECOND].K[i] = rk[RKFIRST].K[i];
rk[RKSECOND].flag_rho_0prime[i] = rk[RKFIRST].flag_rho_0prime[i];
rk[RKSECOND].flag_plastic[i] = rk[RKFIRST].flag_plastic[i];
#endif
#if EPSALPHA_POROSITY
rk[RKSECOND].alpha_epspor[i] = rk[RKSTART].alpha_epspor[i] + dt * (b31 * rk[RKSTART].dalpha_epspordt[i] + b32 * rk[RKFIRST].dalpha_epspordt[i]);
rk[RKSECOND].epsilon_v[i] = rk[RKSTART].epsilon_v[i] + dt * (b31 * rk[RKSTART].depsilon_vdt[i] + b32 * rk[RKFIRST].depsilon_vdt[i]);
#endif
#if INVISCID_SPH
rk[RKSECOND].beta[i] = rk[RKSTART].beta[i] + dt * (b31 * rk[RKSTART].dbetadt[i] + b32 * rk[RKFIRST].dbetadt[i]);
#endif
#if SOLID
int j;
for (j = 0; j < DIM*DIM; j++) {
rk[RKSECOND].S[i*DIM*DIM+j] = rk[RKSTART].S[i*DIM*DIM+j] + dt * (b31 * rk[RKSTART].dSdt[i*DIM*DIM+j] + b32 * rk[RKFIRST].dSdt[i*DIM*DIM+j]);
}
#endif
rk[RKSECOND].vx[i] = rk[RKSTART].vx[i] + dt * (b31 * rk[RKSTART].ax[i] + b32 * rk[RKFIRST].ax[i]);
#if DIM > 1
rk[RKSECOND].vy[i] = rk[RKSTART].vy[i] + dt * (b31 * rk[RKSTART].ay[i] + b32 * rk[RKFIRST].ay[i]);
#endif
#if DIM == 3
rk[RKSECOND].vz[i] = rk[RKSTART].vz[i] + dt * (b31 * rk[RKSTART].az[i] + b32 * rk[RKFIRST].az[i]);
#endif
rk[RKSECOND].x[i] = rk[RKSTART].x[i] + dt * (b31 * rk[RKSTART].dxdt[i] + b32 * rk[RKFIRST].dxdt[i]);
#if DIM > 1
rk[RKSECOND].y[i] = rk[RKSTART].y[i] + dt * (b31 * rk[RKSTART].dydt[i] + b32 * rk[RKFIRST].dydt[i]);
#endif
#if DIM == 3
rk[RKSECOND].z[i] = rk[RKSTART].z[i] + dt * (b31 * rk[RKSTART].dzdt[i] + b32 * rk[RKFIRST].dzdt[i]);
#endif
}
}
__global__ void integrateThirdStep(void)
{
int i;
int d;
#if GRAVITATING_POINT_MASSES
// loop pointmasses
for (i = threadIdx.x + blockIdx.x * blockDim.x; i < numPointmasses; i+= blockDim.x * gridDim.x) {
pointmass.vx[i] = rk_pointmass[RKSTART].vx[i] + dt/6.0 * (c1 * rk_pointmass[RKSTART].ax[i] + c2 * rk_pointmass[RKFIRST].ax[i] + c3 * rk_pointmass[RKSECOND].ax[i]);
pointmass.ax[i] = 1./6.0 *(c1 * rk_pointmass[RKSTART].ax[i] + c2 * rk_pointmass[RKFIRST].ax[i] + c3 * rk_pointmass[RKSECOND].ax[i]);
#if DIM > 1
pointmass.vy[i] = rk_pointmass[RKSTART].vy[i] + dt/6.0 * (c1 * rk_pointmass[RKSTART].ay[i] + c2 * rk_pointmass[RKFIRST].ay[i] + c3 * rk_pointmass[RKSECOND].ay[i]);
pointmass.ay[i] = 1./6.0 *(c1 * rk_pointmass[RKSTART].ay[i] + c2 * rk_pointmass[RKFIRST].ay[i] + c3 * rk_pointmass[RKSECOND].ay[i]);
#endif
#if DIM > 2
pointmass.vz[i] = rk_pointmass[RKSTART].vz[i] + dt/6.0 * (c1 * rk_pointmass[RKSTART].az[i] + c2 * rk_pointmass[RKFIRST].az[i] + c3 * rk_pointmass[RKSECOND].az[i]);
pointmass.az[i] = 1./6.0 *(c1 * rk_pointmass[RKSTART].az[i] + c2 * rk_pointmass[RKFIRST].az[i] + c3 * rk_pointmass[RKSECOND].az[i]);
#endif
pointmass.x[i] = rk_pointmass[RKSTART].x[i] + dt/6.0 * (c1 * rk_pointmass[RKSTART].vx[i] + c2 * rk_pointmass[RKFIRST].vx[i] + c3 * rk_pointmass[RKSECOND].vx[i]);
#if DIM > 1
pointmass.y[i] = rk_pointmass[RKSTART].y[i] + dt/6.0 * (c1 * rk_pointmass[RKSTART].vy[i] + c2 * rk_pointmass[RKFIRST].vy[i] + c3 * rk_pointmass[RKSECOND].vy[i]);
#endif
#if DIM > 2
pointmass.z[i] = rk_pointmass[RKSTART].z[i] + dt/6.0 * (c1 * rk_pointmass[RKSTART].vz[i] + c2 * rk_pointmass[RKFIRST].vz[i] + c3 * rk_pointmass[RKSECOND].vz[i]);
#endif
}
#endif // GRAVITATING_POINT_MASSES
// loop particles
for (i = threadIdx.x + blockIdx.x * blockDim.x; i < numParticles; i+= blockDim.x * gridDim.x) {
//printf("THIRD: vx: %g \t %g :dxdt \t\t\t vy: %g \t %g :dydt\n", velxSecond[i], dxdtSecond[i], velySecond[i], dydtSecond[i]);
#if INTEGRATE_DENSITY
p.rho[i] = rk[RKSTART].rho[i] + dt/6.0 *
( c1 * rk[RKSTART].drhodt[i]
+ c2 * rk[RKFIRST].drhodt[i]
+ c3 * rk[RKSECOND].drhodt[i]);
p.drhodt[i] = 1./6.*(c1 * rk[RKSTART].drhodt[i]
+ c2 * rk[RKFIRST].drhodt[i]
+ c3 * rk[RKSECOND].drhodt[i]);
#else
p.rho[i] = rk[RKSECOND].rho[i];
#endif
#if INTEGRATE_SML
p.h[i] = rk[RKSTART].h[i] + dt/6.0 *
( c1 * rk[RKSTART].dhdt[i]
+ c2 * rk[RKFIRST].dhdt[i]
+ c3 * rk[RKSECOND].dhdt[i]);
p.dhdt[i] = 1./6.*(c1 * rk[RKSTART].dhdt[i]
+ c2 * rk[RKFIRST].dhdt[i]
+ c3 * rk[RKSECOND].dhdt[i]);
#else
p.h[i] = rk[RKSECOND].h[i];
#endif
#if INTEGRATE_ENERGY
p.e[i] = rk[RKSTART].e[i] + dt/6.0 *
( c1 * rk[RKSTART].dedt[i]
+ c2 * rk[RKFIRST].dedt[i]
+ c3 * rk[RKSECOND].dedt[i]);
p.dedt[i] = 1./6.* (c1 * rk[RKSTART].dedt[i]
+ c2 * rk[RKFIRST].dedt[i]
+ c3 * rk[RKSECOND].dedt[i]);
#endif
#if PALPHA_POROSITY
double dp = rk[RKSECOND].p[i] - rk[RKSTART].p[i];
#endif
#if FRAGMENTATION
p.d[i] = rk[RKSTART].d[i] + dt/6.0 *
( c1 * rk[RKSTART].dddt[i]
+ c2 * rk[RKFIRST].dddt[i]
+ c3 * rk[RKSECOND].dddt[i]);
p.dddt[i] = 1./6. * (c1 * rk[RKSTART].dddt[i]
+ c2 * rk[RKFIRST].dddt[i]
+ c3 * rk[RKSECOND].dddt[i]);
#if PALPHA_POROSITY
if (dp > 0.0) {
p.damage_porjutzi[i] = rk[RKSTART].damage_porjutzi[i] + dt/6.0 *
( c1 * rk[RKSTART].ddamage_porjutzidt[i]
+ c2 * rk[RKFIRST].ddamage_porjutzidt[i]
+ c3 * rk[RKSECOND].ddamage_porjutzidt[i]);
p.ddamage_porjutzidt[i] = 1./6. * (c1 * rk[RKSTART].ddamage_porjutzidt[i]
+ c2 * rk[RKFIRST].ddamage_porjutzidt[i]
+ c3 * rk[RKSECOND].ddamage_porjutzidt[i]);
} else {
p.d[i] = p.d[i];
p.damage_porjutzi[i] = rk[RKSTART].damage_porjutzi[i];
}
#endif
#endif
#if JC_PLASTICITY
p.ep[i] = rk[RKSTART].ep[i] + dt/6.0 *
( c1 * rk[RKSTART].edotp[i]
+ c2 * rk[RKFIRST].edotp[i]
+ c3 * rk[RKSECOND].edotp[i]);
p.T[i] = rk[RKSTART].T[i] + dt/6.0 *
( c1 * rk[RKSTART].dTdt[i]
+ c2 * rk[RKFIRST].dTdt[i]
+ c3 * rk[RKSECOND].dTdt[i]);
p.edotp[i] = 1./6. * ( c1 * rk[RKSTART].edotp[i]
+ c2 * rk[RKFIRST].edotp[i]
+ c3 * rk[RKSECOND].edotp[i]);
p.dTdt[i] = 1./6. * ( c1 * rk[RKSTART].dTdt[i]
+ c2 * rk[RKFIRST].dTdt[i]
+ c3 * rk[RKSECOND].dTdt[i]);
#endif
#if PALPHA_POROSITY
if (dp > 0.0) {
p.alpha_jutzi[i] = rk[RKSTART].alpha_jutzi[i] + dt/6.0 *
( c1 * rk[RKSTART].dalphadt[i]
+ c2 * rk[RKFIRST].dalphadt[i]
+ c3 * rk[RKSECOND].dalphadt[i]);
p.dalphadt[i] = 1./6. * (c1 * rk[RKSTART].dalphadt[i]
+ c2 * rk[RKFIRST].dalphadt[i]
+ c3 * rk[RKSECOND].dalphadt[i]);
} else {
p.alpha_jutzi[i] = rk[RKSTART].alpha_jutzi[i];
}
#endif
#if EPSALPHA_POROSITY
p.alpha_epspor[i] = rk[RKSTART].alpha_epspor[i] + dt/6.0 *
( c1 * rk[RKSTART].dalpha_epspordt[i]
+ c2 * rk[RKFIRST].dalpha_epspordt[i]
+ c3 * rk[RKSECOND].dalpha_epspordt[i]);
p.dalpha_epspordt[i] = 1./6. *
( c1 * rk[RKSTART].dalpha_epspordt[i]
+ c2 * rk[RKFIRST].dalpha_epspordt[i]
+ c3 * rk[RKSECOND].dalpha_epspordt[i]);
p.epsilon_v[i] = rk[RKSTART].epsilon_v[i] + dt/6.0 *
( c1 * rk[RKSTART].depsilon_vdt[i]
+ c2 * rk[RKFIRST].depsilon_vdt[i]
+ c3 * rk[RKSECOND].depsilon_vdt[i]);
p.depsilon_vdt[i] = 1./6. *
( c1 * rk[RKSTART].depsilon_vdt[i]
+ c2 * rk[RKFIRST].depsilon_vdt[i]
+ c3 * rk[RKSECOND].depsilon_vdt[i]);
#endif
#if INVISCID_SPH
p.beta[i] = rk[RKSTART].beta[i] + dt/6.0 *
( c1 * rk[RKSTART].dbetadt[i]
+ c2 * rk[RKFIRST].dbetadt[i]
+ c3 * rk[RKSECOND].dbetadt[i]);
p.dbetadt[i] = 1./6. * (c1 * rk[RKSTART].dbetadt[i]
+ c2 * rk[RKFIRST].dbetadt[i]
+ c3 * rk[RKSECOND].dbetadt[i]);
#endif
#if SOLID
int j;
for (j = 0; j < DIM*DIM; j++) {
p.S[i*DIM*DIM+j] = rk[RKSTART].S[i*DIM*DIM+j] + dt/6.0 *
( c1 * rk[RKSTART].dSdt[i*DIM*DIM+j]
+ c2 * rk[RKFIRST].dSdt[i*DIM*DIM+j]
+ c3 * rk[RKSECOND].dSdt[i*DIM*DIM+j]);
p.dSdt[i*DIM*DIM+j] = 1./6. *
( c1 * rk[RKSTART].dSdt[i*DIM*DIM+j]
+ c2 * rk[RKFIRST].dSdt[i*DIM*DIM+j]
+ c3 * rk[RKSECOND].dSdt[i*DIM*DIM+j]);
}
#endif
p.vx[i] = rk[RKSTART].vx[i] + dt/6.0 * (c1 * rk[RKSTART].ax[i] + c2 * rk[RKFIRST].ax[i] + c3 * rk[RKSECOND].ax[i]);
p.ax[i] = 1./6.0 *(c1 * rk[RKSTART].ax[i] + c2 * rk[RKFIRST].ax[i] + c3 * rk[RKSECOND].ax[i]);
p.g_ax[i] = 1./6.0 *(c1 * rk[RKSTART].g_ax[i] + c2 * rk[RKFIRST].g_ax[i] + c3 * rk[RKSECOND].g_ax[i]);
#if DIM > 1
p.vy[i] = rk[RKSTART].vy[i] + dt/6.0 * (c1 * rk[RKSTART].ay[i] + c2 * rk[RKFIRST].ay[i] + c3 * rk[RKSECOND].ay[i]);
p.ay[i] = 1./6.0 *(c1 * rk[RKSTART].ay[i] + c2 * rk[RKFIRST].ay[i] + c3 * rk[RKSECOND].ay[i]);
p.g_ay[i] = 1./6.0 *(c1 * rk[RKSTART].g_ay[i] + c2 * rk[RKFIRST].g_ay[i] + c3 * rk[RKSECOND].g_ay[i]);
#endif
#if DIM > 2
p.vz[i] = rk[RKSTART].vz[i] + dt/6.0 * (c1 * rk[RKSTART].az[i] + c2 * rk[RKFIRST].az[i] + c3 * rk[RKSECOND].az[i]);
p.az[i] = 1./6.0 *(c1 * rk[RKSTART].az[i] + c2 * rk[RKFIRST].az[i] + c3 * rk[RKSECOND].az[i]);
p.g_az[i] = 1./6.0 *(c1 * rk[RKSTART].g_az[i] + c2 * rk[RKFIRST].g_az[i] + c3 * rk[RKSECOND].g_az[i]);
#endif
p.x[i] = rk[RKSTART].x[i] + dt/6.0 * (c1 * rk[RKSTART].dxdt[i] + c2 * rk[RKFIRST].dxdt[i] + c3 * rk[RKSECOND].dxdt[i]);
#if DIM > 1
p.y[i] = rk[RKSTART].y[i] + dt/6.0 * (c1 * rk[RKSTART].dydt[i] + c2 * rk[RKFIRST].dydt[i] + c3 * rk[RKSECOND].dydt[i]);
#endif
#if DIM > 2
p.z[i] = rk[RKSTART].z[i] + dt/6.0 * (c1 * rk[RKSTART].dzdt[i] + c2 * rk[RKFIRST].dzdt[i] + c3 * rk[RKSECOND].dzdt[i]);
#endif
/* remember some more values */
p.noi[i] = rk[RKSECOND].noi[i];
p.p[i] = rk[RKSECOND].p[i];
#if PALPHA_POROSITY
p.pold[i] = rk[RKSECOND].p[i];
#endif
#if SIRONO_POROSITY
p.rho_0prime[i] = rk[RKSECOND].rho_0prime[i];
p.rho_c_plus[i] = rk[RKSECOND].rho_c_plus[i];
p.rho_c_minus[i] = rk[RKSECOND].rho_c_minus[i];
p.compressive_strength[i] = rk[RKSECOND].compressive_strength[i];
p.tensile_strength[i] = rk[RKSECOND].tensile_strength[i];
p.shear_strength[i] = rk[RKSECOND].shear_strength[i];
p.K[i] = rk[RKSECOND].K[i];
p.flag_rho_0prime[i] = rk[RKSECOND].flag_rho_0prime[i];
p.flag_plastic[i] = rk[RKSECOND].flag_plastic[i];
#endif
p.cs[i] = rk[RKSECOND].cs[i];
#if FRAGMENTATION
p.numActiveFlaws[i] = rk[RKSECOND].numActiveFlaws[i];
#endif
#if SOLID
p.local_strain[i] = rk[RKSECOND].local_strain[i];
#endif
#if NAVIER_STOKES
for (d = 0; d < DIM*DIM; d++) {
p.Tshear[i*DIM*DIM+d] = rk[RKSECOND].Tshear[i*DIM*DIM+d];
}
#endif
#if 0
#warning experimental superstuff in rk2adaptive...
if (p_rhs.materialId[i] == EOS_TYPE_IGNORE) {
p.x[i] = 1e12+1e6*i;
p.y[i] = 1e12+1e6*i;
}
#endif
}
}
#if FRAGMENTATION
#define MAX_DAMAGE_CHANGE 1e-2
/* set maximum time step for damage evolution */
__global__ void damageMaxTimeStep(double *maxDamageTimeStepPerBlock)
{
__shared__ double sharedMaxDamageTimeStep[NUM_THREADS_ERRORCHECK];
double localMaxDamageTimeStep = 0;
double tmp = 0;
double dtsuggested = 0;
int i, j, k, m;
for (i = threadIdx.x + blockIdx.x * blockDim.x; i < numParticles; i+= blockDim.x * gridDim.x) {
if (rk[RKFIRST].dddt[i] > 0) {
tmp = 1./ ( (rk[RKFIRST].d[i] + MAX_DAMAGE_CHANGE) / rk[RKFIRST].dddt[i] );
localMaxDamageTimeStep = max(tmp, localMaxDamageTimeStep);
}
}
i = threadIdx.x;
sharedMaxDamageTimeStep[i] = localMaxDamageTimeStep;
for (j = NUM_THREADS_ERRORCHECK / 2; j > 0; j /= 2) {
__syncthreads();
if (i < j) {
k = i + j;
sharedMaxDamageTimeStep[i] = localMaxDamageTimeStep = max(localMaxDamageTimeStep, sharedMaxDamageTimeStep[k]);
}
}
// write block result to global memory
if (i == 0) {
k = blockIdx.x;
maxDamageTimeStepPerBlock[k] = localMaxDamageTimeStep;
m = gridDim.x - 1;
if (m == atomicInc((unsigned int *)&blockCount, m)) {
// last block, so combine all block results
for (j = 0; j <= m; j++) {
localMaxDamageTimeStep = max(localMaxDamageTimeStep, maxDamageTimeStepPerBlock[j]);
}
maxDamageTimeStep = localMaxDamageTimeStep;
// reset block count
blockCount = 0;
if (maxDamageTimeStep > 0) {
dtsuggested = 1./maxDamageTimeStep;
if (dtsuggested > dtmax) {
// printf("<damageMaxTimeStep> timestep %g is larger than maximum timestep %g, reducing to %g\n", dtsuggested, dtmax, dtmax);
dtsuggested = dtmax;
}
if (dtsuggested < dt) {
dt = dtsuggested;
if (currentTimeD+dt > endTimeD) {
dt = endTimeD - currentTimeD;
}
}
}