[WIP] Implementation of DDES and SAS formulations for SST #2150

rois1995 · 2023-10-22T16:16:37Z

Proposed Changes

Hi everyone,

I have been working on the implementation of the DDES formulations for the SST model, following the work in "Development of DDES and IDDES Formulations for the k-ω Shear Stress Transport Model" (DOI:10.1007/s10494-011-9378-4). The implementation is easy, whereas the validation may take some time. I am currently working on the backward facing step and I will work on the flatplate too. The choice of the validation test cases is key since the computational cost is quite large, thus if you have any suggestions that may speed up this part then feel free to write them down.

Implemented versions:

SST-DDES
SST-IDDES
SST-SIDDES

I am also working on the Scale Adaptive Simulations (SAS) implementations for SST, following the work in "ON URANS SOLUTIONS WITH LES-LIKE BEHAVIOUR", Travis et al., and "[Evaluation of scale-adaptive simulation for transonic cavity flows", Babu et al., (https://www.inderscienceonline.com/doi/abs/10.1504/IJESMS.2016.075510). The last one, especially, is quite tricky due to the computation of the velocity laplacian. I tried computing it in Paraview as the divergence of the gradient field and it seems quite similar, but it is the first time that I've touched that section of the code, thus some work might still be needed.

Implemented versions:

SST-SAS_Simple (better naming is necessary), from the article of Travis et al.
SST-SAS_Complicated (better naming is necessary), it is related to the article from Babu et al.

PR Checklist

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I am submitting my contribution to the develop branch.
My contribution generates no new compiler warnings (try with --warnlevel=3 when using meson).
My contribution is commented and consistent with SU2 style (https://su2code.github.io/docs_v7/Style-Guide/).
I used the pre-commit hook to prevent dirty commits and used pre-commit run --all to format old commits.
I have added a test case that demonstrates my contribution, if necessary.
I have updated appropriate documentation (Tutorials, Docs Page, config_template.cpp), if necessary.

…ons based on k and w - Added computation of k and w starting from SA variables - Added first implementation of SAS (Scale Adaptive Simulation) model

- Changed previous SAS model to SAS_SIMPLE

- Fixed DataType for Periodic Comms

…lified IDDES (SIDDES)

SU2_CFD/src/solvers/CTurbSSTSolver.cpp

+    switch(kind_hybridRANSLES){
+      case SST_DDES: {
+
+        const su2double r_d = (eddyVisc + lamVisc) / max((KolmConst2*wallDist2 * sqrt(0.5 * (StrainMag*StrainMag + VortMag*VortMag))), 1e-10);
+        const su2double C_d1 = 20.0;
+        const su2double C_d2 = 3.0;
+
+        const su2double f_d = 1 - tanh(pow(C_d1 * r_d, C_d2));
+
+        const su2double l_LES = C_DES * h_max;
+
+        DES_lengthScale = l_RANS - f_d * max(0.0, l_RANS - l_LES);
+
+        nodes->SetDebug_Quantities(config, iPoint, f_d, l_RANS, l_LES, r_d);
+
+        break;
+      }
+      case SST_IDDES: {
+
+        // Constants
+        const su2double C_w = 0.15;
+        const su2double C_dt1 = 20.0;
+        const su2double C_dt2 = 3.0;
+        const su2double C_l = 5.0;
+        const su2double C_t = 1.87;
+
+        const su2double alpha = 0.25 - sqrt(wallDist2) / h_max;
+        const su2double f_b = min(2.0 * exp(-9.0 * alpha*alpha), 1.0);
+        const su2double r_dt = eddyVisc / max((KolmConst2*wallDist2 * sqrt(0.5 * (StrainMag*StrainMag + VortMag*VortMag))), 1e-10);
+        const su2double f_dt = 1 - tanh(pow(C_dt1 * r_dt, C_dt2));
+        const su2double ftilda_d = max(1.0 - f_dt, f_b);
+
+        const su2double r_dl = lamVisc / max((KolmConst2*wallDist2 * sqrt(0.5 * (StrainMag*StrainMag + VortMag*VortMag))), 1e-10);
+        const su2double f_l = tanh(pow(C_l*C_l*r_dl, 10.0));
+        const su2double f_t = tanh(pow(C_t*C_t*r_dt, 3.0));
+        const su2double f_e2 = 1.0 - max(f_t, f_l);
+        const su2double f_e1 = alpha >= 0.0 ? 2.0 * exp(-11.09*alpha*alpha) : 2.0 * exp(-9.0*alpha*alpha);
+        const su2double f_e = f_e2 * max((f_e1 - 1.0), 0.0);
+
+
+        const su2double Delta = min(C_w * max(sqrt(wallDist2), h_max), h_max);
+        const su2double l_LES = C_DES * Delta;
+
+        nodes->SetDebug_Quantities(config, iPoint, ftilda_d, l_RANS, l_LES, r_dl, r_dt);
+
+        DES_lengthScale = ftilda_d *(1.0+f_e)*l_RANS + (1.0 - ftilda_d) * l_LES;
+
+        break;
+      }
+      case SST_SIDDES: {
+
+        // Constants
+        const su2double C_w = 0.15;
+        const su2double C_dt1 = 20.0;
+        const su2double C_dt2 = 3.0;
+        const su2double C_l = 5.0;
+        const su2double C_t = 1.87;
+
+        const su2double alpha = 0.25 - sqrt(wallDist2) / h_max;
+        const su2double f_b = min(2.0 * exp(-9.0 * alpha*alpha), 1.0);
+        const su2double r_dt = eddyVisc / max((KolmConst2*wallDist2 * sqrt(0.5 * (StrainMag*StrainMag + VortMag*VortMag))), 1e-10);
+        const su2double f_dt = 1 - tanh(pow(C_dt1 * r_dt, C_dt2));
+        const su2double ftilda_d = max(1.0 - f_dt, f_b);
+
+        const su2double Delta = min(C_w * max(sqrt(wallDist2), h_max), h_max);
+        const su2double l_LES = C_DES * Delta;
+
+        nodes->SetDebug_Quantities(config, iPoint, ftilda_d, l_RANS, l_LES, r_dt);
+
+        DES_lengthScale = ftilda_d*l_RANS + (1.0 - ftilda_d) * l_LES;
+
+        break;
+      }
+    }


SU2_CFD/src/solvers/CTurbSSTSolver.cpp

@@ -1060,3 +1075,112 @@
  }

 }
+
+
+void CTurbSSTSolver::SetDES_LengthScale(CSolver **solver, CGeometry *geometry, CConfig *config){


pcarruscag · 2023-10-24T07:50:37Z

Common/include/option_structure.hpp

+  SAS_SIMPLE,         /*!< \brief Menter k-w SST model with Scale Adaptive Simulations modifications. */
+  SAS_COMPLICATED,         /*!< \brief Menter k-w SST model with Scale Adaptive Simulations modifications. */


Are these the names in the literature?

No, these are just placeholders. There are no names in literature, that is why I named them according to the complexity of the model

Maybe something after the authors since the models come from different papers.

Sure, why not

pcarruscag · 2023-10-24T07:52:24Z

Common/include/option_structure.hpp

+  SST_OPTIONS sasModel = SST_OPTIONS::SAS_SIMPLE;   /*!< \brief Enum SST base model. */
  bool sust = false;                          /*!< \brief Bool for SST model with sustaining terms. */
  bool uq = false;                            /*!< \brief Bool for using uncertainty quantification. */
+  bool sas = false;                           /*!< \brief Bool for using Scale Adaptive Simulations. */


Probably the type is enough and "none" indicates no sas.

Suggested change

SST_OPTIONS sasModel = SST_OPTIONS::SAS_SIMPLE; /*!< \brief Enum SST base model. */

bool sust = false; /*!< \brief Bool for SST model with sustaining terms. */

bool uq = false; /*!< \brief Bool for using uncertainty quantification. */

bool sas = false; /*!< \brief Bool for using Scale Adaptive Simulations. */

SST_OPTIONS sasModel = SST_OPTIONS::NONE; /*!< \brief Enum SST base model. */

bool sust = false; /*!< \brief Bool for SST model with sustaining terms. */

bool uq = false; /*!< \brief Bool for using uncertainty quantification. */

Sure, I'll modify it.

pcarruscag · 2023-10-24T07:53:10Z

Common/src/CConfig.cpp

+          case SST_DDES: cout << "Delayed Detached Eddy Simulation (DDES) with Shear-layer Adapted SGS" << endl; break;
+          case SST_IDDES: cout << "Delayed Detached Eddy Simulation (DDES) with Shear-layer Adapted SGS" << endl; break;
+          case SST_SIDDES: cout << "Delayed Detached Eddy Simulation (DDES) with Shear-layer Adapted SGS" << endl; break;


The description is slightly different right?

Yes, I planned to modify the details on the final implementation. I'll do it now

pcarruscag · 2023-10-24T07:54:33Z

SU2_CFD/include/numerics/CNumerics.hpp

@@ -190,6 +190,10 @@ class CNumerics {

  bool bounded_scalar = false;    /*!< \brief Flag for bounded scalar problem */

+  su2double lengthScale_i, lengthScale_j;
+  su2double FTrans;   /*!< \brief SAS function */
+  su2double VelLapl_X, VelLapl_Y, VelLapl_Z;


Use a matrix type for the laplacian in CVariable and here you can have a pointer instead.
Put these variables close to other turbulence variables please.

pcarruscag · 2023-10-24T07:56:34Z

SU2_CFD/include/numerics/turbulent/turb_sources.hpp

+        su2double VelLaplMag = VelLapl_X*VelLapl_X + VelLapl_Y*VelLapl_Y;
+        if (nDim == 3) VelLaplMag += VelLapl_Z*VelLapl_Z;
+        const su2double L_vK_1 = KolmConst * StrainMag_i / sqrt(VelLaplMag);


Is the velocity laplacian only used for the source term? Or will you have changes to the convection or diffusion fluxes?

It is just for the source term

pcarruscag · 2023-10-24T08:00:36Z

SU2_CFD/include/variables/CTurbSAVariable.hpp

+  /*!
+   * \brief Get the value of the turbulence kinetic energy.
+   * \return the value of the turbulence kinetic energy.
+   */
+  inline su2double GetSSTVariables_k(unsigned long iPoint) const { return k(iPoint); }
+
+  /*!
+   * \brief Get the value of the turbulence frequency Omega.
+   * \return the value of the turbulence frequency Omega.
+   */
+  inline su2double GetSSTVariables_omega(unsigned long iPoint) const { return Omega(iPoint); }
+
+  /*!
+   * \brief Set the value of the SST variables computed with SA solution.
+   * \param[in] val_k
+   * \param[in] val_Omega
+   */
+  void SetSSTVariables(unsigned long iPoint, su2double val_k, su2double val_Omega) {
+    k(iPoint) = val_k;


Are these changes related to the main theme? or were just debugging? If they can be separated to another PR let's do that please.

These are for computing the grid size for scale resolving simulations from an SA solution. Probably it has to be revised a little bit, since I found out that the formulation for the TKE is different if the QCR mod is used, thus I think I'll remove them for now.

pcarruscag · 2023-10-24T08:10:12Z

externals/codi

You need to undo this change to the codi version.

Sure, I'll do it

pcarruscag · 2023-10-24T08:12:12Z

SU2_CFD/src/output/CFlowOutput.cpp

+    if ( config->GetKind_HybridRANSLES() == SST_DDES){
+      SetVolumeOutputValue("F_D", iPoint, Node_Turb->Get_ftilda_d(iPoint));
+      SetVolumeOutputValue("L_RANS", iPoint, Node_Turb->Get_L_RANS(iPoint));
+      SetVolumeOutputValue("L_LES", iPoint, Node_Turb->Get_L_LES(iPoint));
+      SetVolumeOutputValue("R_D", iPoint, Node_Turb->Get_r_d(iPoint));
+    } else if ( config->GetKind_HybridRANSLES() == SST_IDDES){
+      SetVolumeOutputValue("F_D", iPoint, Node_Turb->Get_ftilda_d(iPoint));
+      SetVolumeOutputValue("L_RANS", iPoint, Node_Turb->Get_L_RANS(iPoint));
+      SetVolumeOutputValue("L_LES", iPoint, Node_Turb->Get_L_LES(iPoint));
+      SetVolumeOutputValue("R_DT", iPoint, Node_Turb->Get_r_dt(iPoint));
+      SetVolumeOutputValue("R_DL", iPoint, Node_Turb->Get_r_dl(iPoint));
+    } else if ( config->GetKind_HybridRANSLES() == SST_SIDDES){
+      SetVolumeOutputValue("F_D", iPoint, Node_Turb->Get_ftilda_d(iPoint));
+      SetVolumeOutputValue("L_RANS", iPoint, Node_Turb->Get_L_RANS(iPoint));
+      SetVolumeOutputValue("L_LES", iPoint, Node_Turb->Get_L_LES(iPoint));
+      SetVolumeOutputValue("R_DT", iPoint, Node_Turb->Get_r_dt(iPoint));
+    }


Cleanup the repetition here, most statement are shared across the 3 cases

pcarruscag · 2023-10-24T08:12:52Z

SU2_CFD/src/output/CFlowOutput.cpp

+    }
+    const su2double mut = Node_Flow->GetEddyViscosity(iPoint);
+    const su2double mu = Node_Flow->GetLaminarViscosity(iPoint); 
+    const su2double LESIQ = 1.0/(1.0+0.05*pow((mut+mu)/mu, 0.53));


Are the constant here also used somewhere else? It would be good to avoid repeating hard-coded constants

They are used just here

pcarruscag · 2023-10-24T08:14:22Z

SU2_CFD/include/variables/CVariable.hpp

+  inline virtual su2double GetVelLapl_X(unsigned long iPoint) const { return 0.0; }
+  /*!
+   * \brief Get the value of the value of FTrans.
+   */
+  inline virtual su2double GetVelLapl_Y(unsigned long iPoint) const { return 0.0; }
+  /*!
+   * \brief Get the value of the value of FTrans.
+   */
+  inline virtual su2double GetVelLapl_Z(unsigned long iPoint) const { return 0.0; }
+
+  /*!
+   * \brief Set the value of the value of FTrans.
+   */
+  inline virtual void AddVelLapl(unsigned long iPoint, su2double val_VelLapl_X, su2double val_VelLapl_Y) {}
+  /*!
+   * \brief Set the value of the value of FTrans.
+   */
+  inline virtual void AddVelLapl_Z(unsigned long iPoint, su2double val_VelLapl_Z) {}
+  /*!
+   * \brief Set the value of the value of FTrans.
+   */
+  inline virtual void SetVelLapl(unsigned long iPoint, su2double val_VelLapl_X, su2double val_VelLapl_Y) {}


Use a pointer for velocity and then you only need one of each function instead of handling xyz separately.

Yeah, I'll try using the matrix type

- Changed names of SAS models - Added descriptions of functions - Clean up of output functions - Removed SA functions or SST variables

pcarruscag · 2023-11-01T18:17:44Z

SU2_CFD/include/numerics/CNumerics.hpp

@@ -136,6 +136,9 @@ class CNumerics {
  const su2double
  *TurbPsi_i,  /*!< \brief Vector of adjoint turbulent variables at point i. */
  *TurbPsi_j;  /*!< \brief Vector of adjoint turbulent variables at point j. */
+  su2double lengthScale_i, lengthScale_j; /*!< \brief length scale for SST */
+  su2double FTrans;   /*!< \brief SAS function */
+  su2double *VelLapl; /*!< \brief Laplacian of the velocity */


Suggested change

su2double *VelLapl; /*!< \brief Laplacian of the velocity */

const su2double *VelLapl; /*!< \brief Laplacian of the velocity */

pcarruscag · 2023-11-01T18:17:54Z

SU2_CFD/include/numerics/CNumerics.hpp

+  /*!
+   * \brief Get the value of the value of FTrans.
+   */
+  inline void SetVelLapl(su2double* val_VelLapl) {


Suggested change

inline void SetVelLapl(su2double* val_VelLapl) {

inline void SetVelLapl(const su2double* val_VelLapl) {

pcarruscag · 2023-11-01T18:20:56Z

SU2_CFD/src/output/CFlowOutput.cpp

+      AddVolumeOutput("SRS_GRID_SIZE", "Srs_grid_size", "SOLUTION", "desired grid size for Scale Resolving Simulations");
      break;

    case TURB_FAMILY::KW:
      AddVolumeOutput("TKE", "Turb_Kin_Energy", "SOLUTION", "Turbulent kinetic energy");
      AddVolumeOutput("DISSIPATION", "Omega", "SOLUTION", "Rate of dissipation");
+      AddVolumeOutput("SRS_GRID_SIZE", "Srs_grid_size", "SOLUTION", "desired grid size for Scale Resolving Simulations");
+      if (config->GetSSTParsedOptions().sasModel == SST_OPTIONS::SAS_TRAVIS) AddVolumeOutput("FTRANS", "FTrans", "SOLUTION", "value of FTrans for SAS simulation");
+      if (config->GetSSTParsedOptions().sasModel == SST_OPTIONS::SAS_BABU){
+        AddVolumeOutput("VEL-LAPLACIAN_X", "Vel Laplacian x", "SOLUTION", "value of laplacian of x-velocity for SAS simulation");
+        AddVolumeOutput("VEL-LAPLACIAN_Y", "Vel Laplacian y", "SOLUTION", "value of laplacian of y-velocity for SAS simulation");
+        if (nDim == 3) AddVolumeOutput("VEL-LAPLACIAN_Z", "Vel Laplacian z", "SOLUTION", "value of laplacian of z-velocity for SAS simulation");


These outputs need to go somewhere else or they will break the restarts.
Solution is exclusively for solution variables, these are derived, put them where we have similar things (e.g. Q criterion)

pcarruscag · 2023-11-01T18:23:24Z

SU2_CFD/src/solvers/CTurbSSTSolver.cpp

+        /*--- If iPoint is boundary it only takes contributions from other boundary points. ---*/
+        if (boundary_i && !boundary_j) continue;
+
+        /*--- Add solution differences, with correction for compressible flows which use the enthalpy. ---*/


Check if comments need updates please

bigfooted · 2024-02-07T15:48:09Z

Hi @rois1995 any progress? Would be very interesting to add this to develop, looking forward to using it actually.

rois1995 · 2024-03-07T13:31:32Z

Hi @rois1995 any progress? Would be very interesting to add this to develop, looking forward to using it actually.

Hi @bigfooted, unfortunately I do not have enough time/computational power to perform a proper validation. I only tried something with a NACA0021 at 17 deg and 60 deg and they were promising, at least for the DDES implementation. The SAS ones are not that good. I'll upload some post-processing as soon as I have the time to do so.

Linnnnnn23 · 2024-04-19T07:54:55Z

I find your work really interesting. I've been studying the internal flow field in compressors and have had good results using SU2's SA_EDDES for calculating the cantilevered stator with a tip clearance. If you need help with code verification, I'd be glad to assist.

rois1995 · 2024-04-23T08:49:06Z

I find your work really interesting. I've been studying the internal flow field in compressors and have had good results using SU2's SA_EDDES for calculating the cantilevered stator with a tip clearance. If you need help with code verification, I'd be glad to assist.

Hi @Linnnnnn23, every help on the validation/verification is gladly accepted! Let me know if you need anything by my side.

Linnnnnn23 · 2024-04-23T11:30:53Z

I find your work really interesting. I've been studying the internal flow field in compressors and have had good results using SU2's SA_EDDES for calculating the cantilevered stator with a tip clearance. If you need help with code verification, I'd be glad to assist.

Hi @Linnnnnn23, every help on the validation/verification is gladly accepted! Let me know if you need anything by my side.
Thank you for your response. Firstly, I would like to know what Verification and Validation (V&V) work has been conducted on the SST-based DDES (Delayed Detached Eddy Simulation) model to date. Secondly, we can provide a compressor cascade validation, with an inlet Mach number of 0.4, a Reynolds number of approximately 500,000, and a spanwise height of about 20% of the chord length, ensuring that the vortices resolved by DDES can develop in three dimensions. Thirdly, as I am a rookie to GitHub, I have not yet found out how to download your pull request code. For further communication, you can contact me via email at [email protected]

BerkeCan97 · 2024-10-24T08:34:32Z

Hi @rois1995 , I'd like to help with validation/verification if I can. Let me know if you are interested. You can contact me at [email protected].

BerkeCan97 · 2024-10-30T12:59:03Z

Hi @rois1995 any progress? Would be very interesting to add this to develop, looking forward to using it actually.

Hi @bigfooted, unfortunately I do not have enough time/computational power to perform a proper validation. I only tried something with a NACA0021 at 17 deg and 60 deg and they were promising, at least for the DDES implementation. The SAS ones are not that good. I'll upload some post-processing as soon as I have the time to do so.

Hi @rois1995, I believe there is an error or a typo in the Babu's paper in the Q_SAS source term and in turn in your implementation, which may be the reason for the poor performance in SAS results.

This term changes units depending on the output of the max function, which doesn't make any sense. I believe the terms in the max function should be divided by omega^2 and k^2 instead of omega and k, respectively. Which is exactly how it is done in https://resolver.tudelft.nl/uuid:5d23e2a6-5675-450d-bf3d-1dd40d736cae

I will try some of the benchmark cases in these papers when I have the time. Let me know what you think.

[edit: fixed the link to the tudelft repository]

SU2_CFD/include/numerics/turbulent/turb_sources.hpp

rois1995 · 2024-10-30T13:24:07Z

hi @BerkeCan97, thank you for your correction and for helping with the verification part. Indeed, that term seems really wrong, thus I expect that your correction would improve the results. However, the link that you have provided for the corrected version is broken, can you fix it please?

Regarding the test-cases, we were trying to run the NACA0021 at 60deg AoA, but with relatively poor results. Maybe we should start with the flatplate and the mixing layer proposed originally in the implementation of the DDES formulation coupled to the SA model in https://www.researchgate.net/profile/Cleber-Spode-2/publication/318143234_Hybrid_RANSLES_Calculations_in_SU2/links/59c07bfba6fdcca8e56fe3c3/Hybrid-RANS-LES-Calculations-in-SU2.pdf (or any other test-case in the paper you proposed, but I am not able to read that).

BerkeCan97 · 2024-10-30T13:35:29Z

hi @BerkeCan97, thank you for your correction and for helping with the verification part. Indeed, that term seems really wrong, thus I expect that your correction would improve the results. However, the link that you have provided for the corrected version is broken, can you fix it please?

Regarding the test-cases, we were trying to run the NACA0021 at 60deg AoA, but with relatively poor results. Maybe we should start with the flatplate and the mixing layer proposed originally in the implementation of the DDES formulation coupled to the SA model in https://www.researchgate.net/profile/Cleber-Spode-2/publication/318143234_Hybrid_RANSLES_Calculations_in_SU2/links/59c07bfba6fdcca8e56fe3c3/Hybrid-RANS-LES-Calculations-in-SU2.pdf (or any other test-case in the paper you proposed, but I am not able to read that).

Fixed it! I think we can start with flat plate and maybe BFS. It might take a week or so for me to get anything done though.

rois1995 · 2024-10-30T13:43:37Z

Fixed it! I think we can start with flat plate and maybe BFS. It might take a week or so for me to get anything done though.

Sorry but it still says "Error 404 page not found". Maybe I cannot access it. Can you share the title please?

A colleague of mine is working on the verification too on the flatplate, we will soon share the results and we will build on top of these ones.

BerkeCan97 · 2024-10-31T11:12:04Z

Fixed it! I think we can start with flat plate and maybe BFS. It might take a week or so for me to get anything done though.

Sorry but it still says "Error 404 page not found". Maybe I cannot access it. Can you share the title please?

A colleague of mine is working on the verification too on the flatplate, we will soon share the results and we will build on top of these ones.

Evaluation of the SST-SAS Model, L. Davidson

I can also start working on BFS if you think you got the flatplate covered or we both can work on flatplate to cross check each other. What do you think?

rois1995 · 2024-10-31T14:21:15Z

I think I got the flatplate covered, it should be easy (if the equations have been implemented correctly). The backward facing step and the diffuser I think are the most natural continuation as test cases, what do you think about it?

BerkeCan97 · 2024-11-04T06:50:02Z

I'll start working on BFS then. I'll let you know if anything comes up.

rguglielmi99 · 2024-11-08T13:56:21Z

I am currently working with @rois1995 on the flat plate case, taking as a reference result the skin friction coefficient computed using the coarse grid and the SA_DDES model (∆=∆max) from figure 3a in Hybrid RANS-LES Calculations in SU2. I ran the simulations using the already available SA_DDES model, to be compared with the reference result, and the models under development for SST (SST_DDES,SST_IDDES,SST_SIDDES). The reference data were extracted using a plot digitalizer, so they may be not so accurate, particularly in the zoom region. I attach also the density residuals for all the simulations and the TKE residuals for the simulations conducted with SST. The options SST_IDDES and SST_SIDDES do not allow a complete convergence and this issue is associated to a region close to the inlet and the symmetry boundary conditions. Although seemingly the implementation of the models does not have a direct dependence on the boundary conditions, this issue is absent for SST_DDES. As evidence of this undesirable and unexpected behavior, I attach the plot of the vertical velocity computed along a line parallel to the symmetry boundary (y=1e-6 , x between -0.33 and -0.05, with the flat plate beginning at x=0). I am currently working for understanding its cause.

BerkeCan97 · 2024-11-11T13:33:01Z

That's strange indeed. Could you share your cfg and mesh files so I can also take a look at it?
Meanwhile I am waiting for the IT guys to compile it on my cluster but it is taking a while I guess...

rguglielmi99 · 2024-11-12T16:56:55Z

The reference config file for the simulations with SST model is ddes_flatplate.txt. To switch between SST_DDES, SST_IDDES, SST_SIDDES I only modify the option HYBRID_RANSLES. The mesh I am using can be downloaded at mesh .

BerkeCan97 · 2024-11-13T07:11:42Z

Hi @rguglielmi99 , I noticed that the mesh you are using is 2D. I don't think it makes sense to use a 2D grid in DES solutions because the Eddies are in itself 3D flow features. I do not think that's what causing a problem but it is worth a try.

rguglielmi99 · 2024-11-14T14:27:47Z

Hi @BerkeCan97, thank you for the suggestion. It was an aspect I had already considered. However, I made the same choice as in the reference paper Hybrid RANS-LES Calculations in SU2 where DDES with SA model are performed using 2D grids. There, it is assumed that the boundary layer is in quasi-2D mode, and therefore, 3D effects are considered negligible.

rois1995 and others added 11 commits September 15, 2023 09:21

- Added computation of desired grid size for Scale Resolving Simulati…

388f85a

…ons based on k and w - Added computation of k and w starting from SA variables - Added first implementation of SAS (Scale Adaptive Simulation) model

- Added a more complex SAS model named SAS_COMPLICATED

41cb27e

- Changed previous SAS model to SAS_SIMPLE

- Fixed getting coordinates of points

a6be2cf

- Fixed DataType for Periodic Comms

- Added output of laplacian

d1f4db6

- Fixed missing variable initialization for CTurbSAVariable

35958b8

- Added DES implementations to SST: DDES, Improved DDES (IDDES), Simp…

09e977f

…lified IDDES (SIDDES)

- Added SST DDES in config

8c8e89d

- Added Debug quantities

71ac9c4

- Added division by 0 protection

5b5fc30

- Added computation of LESIQ to Output

ef50283

Merge branch 'develop' into feature_SST_IDDES

91c742e

github-advanced-security bot found potential problems Oct 22, 2023

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rois1995 added 2 commits October 23, 2023 19:07

Merge 'origin/feature_SAS' into feature_SST_IDDES

6c86a19

- modified codi

48a9f3d

rois1995 changed the title ~~[WIP] Implementation of DDES formulations for SST~~ [WIP] Implementation of DDES and SAS formulations for SST Oct 23, 2023

pcarruscag reviewed Oct 24, 2023

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- Modified Velocity Laplacian (vector -> Matrix)

ae33b05

- Changed names of SAS models - Added descriptions of functions - Clean up of output functions - Removed SA functions or SST variables

pcarruscag reviewed Nov 1, 2023

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bigfooted added the changelog:feature label Nov 12, 2023

rois1995 added 3 commits September 20, 2024 09:37

- Added outputs log for SST-DDES

6443070

Merge remote-tracking branch 'origin/develop' into feature_SST_IDDES

caf0d41

- update externals

a584526

BerkeCan97 reviewed Oct 30, 2024

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SU2_CFD/include/numerics/turbulent/turb_sources.hpp Outdated Show resolved Hide resolved

BerkeCan97 reviewed Oct 30, 2024

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SU2_CFD/include/numerics/turbulent/turb_sources.hpp Outdated Show resolved Hide resolved

rois1995 added 3 commits October 30, 2024 14:53

Merge remote-tracking branch 'origin/develop' into feature_SST_IDDES

0f3a832

Fix SAS Babu implementation

710e1dc

- Fixed compilation error

e4f28d4

		SAS_SIMPLE, /!< \brief Menter k-w SST model with Scale Adaptive Simulations modifications. /
		SAS_COMPLICATED, /!< \brief Menter k-w SST model with Scale Adaptive Simulations modifications. /

	su2double VelLapl; /!< \brief Laplacian of the velocity */
	const su2double VelLapl; /!< \brief Laplacian of the velocity */

	inline void SetVelLapl(su2double* val_VelLapl) {
	inline void SetVelLapl(const su2double* val_VelLapl) {

[WIP] Implementation of DDES and SAS formulations for SST #2150

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[WIP] Implementation of DDES and SAS formulations for SST #2150

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rois1995 commented Oct 22, 2023 • edited Loading

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bigfooted commented Feb 7, 2024

rois1995 commented Mar 7, 2024

Linnnnnn23 commented Apr 19, 2024

rois1995 commented Apr 23, 2024

Linnnnnn23 commented Apr 23, 2024

BerkeCan97 commented Oct 24, 2024

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