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fixup: BC created before ghost particles are incorrect #132

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merged 1 commit into from
Sep 24, 2024
Merged

fixup: BC created before ghost particles are incorrect #132

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38 changes: 19 additions & 19 deletions examples/mechanics/crack_branching.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -78,12 +78,9 @@ void crackBranchingExample( const std::string filename )
exec_space{}, inputs );

// ====================================================
// Boundary conditions
// Boundary conditions planes
// ====================================================
double sigma0 = inputs["traction"];
double dy = particles->dx[1];
double b0 = sigma0 / dy;

CabanaPD::RegionBoundary<CabanaPD::RectangularPrism> plane1(
low_corner[0], high_corner[0], low_corner[1] - dy, low_corner[1] + dy,
low_corner[2], high_corner[2] );
Expand All @@ -92,21 +89,6 @@ void crackBranchingExample( const std::string filename )
low_corner[2], high_corner[2] );
std::vector<CabanaPD::RegionBoundary<CabanaPD::RectangularPrism>> planes = {
plane1, plane2 };
auto particles_f = particles->getForce();
auto particles_x = particles->getReferencePosition();
// Create a symmetric force BC in the y-direction.
auto bc_op = KOKKOS_LAMBDA( const int pid, const double )
{
// Get a modifiable copy of force.
auto p_f = particles_f.getParticleView( pid );
// Get a copy of the position.
auto p_x = particles_x.getParticle( pid );
auto ypos = Cabana::get( p_x, CabanaPD::Field::ReferencePosition(), 1 );
auto sign = std::abs( ypos ) / ypos;
Cabana::get( p_f, CabanaPD::Field::Force(), 1 ) += b0 * sign;
};
auto bc = createBoundaryCondition( bc_op, exec_space{}, *particles, planes,
true );

// ====================================================
// Custom particle initialization
Expand Down Expand Up @@ -134,6 +116,24 @@ void crackBranchingExample( const std::string filename )
auto cabana_pd = CabanaPD::createSolverFracture<memory_space>(
inputs, particles, force_model, prenotch );

// ====================================================
// Boundary conditions
// ====================================================
// Create BC last to ensure ghost particles are included.
double sigma0 = inputs["traction"];
double b0 = sigma0 / dy;
f = particles->sliceForce();
x = particles->sliceReferencePosition();
// Create a symmetric force BC in the y-direction.
auto bc_op = KOKKOS_LAMBDA( const int pid, const double )
{
auto ypos = x( pid, 1 );
auto sign = std::abs( ypos ) / ypos;
f( pid, 1 ) += b0 * sign;
};
auto bc = createBoundaryCondition( bc_op, exec_space{}, *particles, planes,
true );

// ====================================================
// Simulation run
// ====================================================
Expand Down
23 changes: 12 additions & 11 deletions examples/mechanics/kalthoff_winkler.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -91,17 +91,6 @@ void kalthoffWinklerExample( const std::string filename )
auto particles = CabanaPD::createParticles<memory_space, model_type>(
exec_space(), low_corner, high_corner, num_cells, halo_width );

// ====================================================
// Boundary conditions
// ====================================================
double dx = particles->dx[0];
double x_bc = -0.5 * height;
CabanaPD::RegionBoundary<CabanaPD::RectangularPrism> plane(
x_bc - dx, x_bc + dx, y_prenotch1 - 0.25 * dx, y_prenotch2 + 0.25 * dx,
-thickness, thickness );
auto bc = createBoundaryCondition( CabanaPD::ForceValueBCTag{}, 0.0,
exec_space{}, *particles, plane );

// ====================================================
// Custom particle initialization
// ====================================================
Expand All @@ -110,6 +99,7 @@ void kalthoffWinklerExample( const std::string filename )
auto v = particles->sliceVelocity();
auto f = particles->sliceForce();

double dx = particles->dx[0];
double v0 = inputs["impactor_velocity"];
auto init_functor = KOKKOS_LAMBDA( const int pid )
{
Expand All @@ -128,6 +118,17 @@ void kalthoffWinklerExample( const std::string filename )
auto cabana_pd = CabanaPD::createSolverFracture<memory_space>(
inputs, particles, force_model, prenotch );

// ====================================================
// Boundary conditions
// ====================================================
// Create BC last to ensure ghost particles are included.
double x_bc = -0.5 * height;
CabanaPD::RegionBoundary<CabanaPD::RectangularPrism> plane(
x_bc - dx, x_bc + dx, y_prenotch1 - 0.25 * dx, y_prenotch2 + 0.25 * dx,
-thickness, thickness );
auto bc = createBoundaryCondition( CabanaPD::ForceValueBCTag{}, 0.0,
exec_space{}, *particles, plane );

// ====================================================
// Simulation run
// ====================================================
Expand Down
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