Merge pull request #1124 from Nicola-Fonzi/publish

Update of the python fsi interface and new feature coupling SU2 with Nastran

Author: pcarruscag

Common/include/CConfig.hpp

@@ -196,6 +196,7 @@ class CConfig {
   nMarker_NearFieldBound,         /*!< \brief Number of near field boundary markers. */
   nMarker_ActDiskInlet,           /*!< \brief Number of actuator disk inlet markers. */
   nMarker_ActDiskOutlet,          /*!< \brief Number of actuator disk outlet markers. */
+  nMarker_Deform_Mesh_Sym_Plane,  /*!< \brief Number of markers with symmetric deformation */
   nMarker_Deform_Mesh,            /*!< \brief Number of deformable markers at the boundary. */
   nMarker_Fluid_Load,             /*!< \brief Number of markers in which the flow load is computed/employed. */
   nMarker_Fluid_InterfaceBound,   /*!< \brief Number of fluid interface markers. */
@@ -242,6 +243,7 @@ class CConfig {
   *Marker_TurboBoundOut,          /*!< \brief Turbomachinery performance boundary donor markers. */
   *Marker_NearFieldBound,         /*!< \brief Near Field boundaries markers. */
   *Marker_Deform_Mesh,            /*!< \brief Deformable markers at the boundary. */
+  *Marker_Deform_Mesh_Sym_Plane,  /*!< \brief Marker with symmetric deformation. */
   *Marker_Fluid_Load,             /*!< \brief Markers in which the flow load is computed/employed. */
   *Marker_Fluid_InterfaceBound,   /*!< \brief Fluid interface markers. */
   *Marker_CHTInterface,           /*!< \brief Conjugate heat transfer interface markers. */
@@ -703,6 +705,7 @@ class CConfig {
   *Marker_All_DV,                    /*!< \brief Global index for design variable markers using the grid information. */
   *Marker_All_Moving,                /*!< \brief Global index for moving surfaces using the grid information. */
   *Marker_All_Deform_Mesh,           /*!< \brief Global index for deformable markers at the boundary. */
+  *Marker_All_Deform_Mesh_Sym_Plane, /*!< \brief Global index for markers with symmetric deformations. */
   *Marker_All_Fluid_Load,            /*!< \brief Global index for markers in which the flow load is computed/employed. */
   *Marker_All_PyCustom,              /*!< \brief Global index for Python customizable surfaces using the grid information. */
   *Marker_All_Designing,             /*!< \brief Global index for moving using the grid information. */
@@ -717,6 +720,7 @@ class CConfig {
   *Marker_CfgFile_MixingPlaneInterface,  /*!< \brief Global index for MixingPlane interface using the config information. */
   *Marker_CfgFile_Moving,             /*!< \brief Global index for moving surfaces using the config information. */
   *Marker_CfgFile_Deform_Mesh,        /*!< \brief Global index for deformable markers at the boundary. */
+  *Marker_CfgFile_Deform_Mesh_Sym_Plane, /*!< \brief Global index for markers with symmetric deformations. */
   *Marker_CfgFile_Fluid_Load,         /*!< \brief Global index for markers in which the flow load is computed/employed. */
   *Marker_CfgFile_PyCustom,           /*!< \brief Global index for Python customizable surfaces using the config information. */
   *Marker_CfgFile_DV,                 /*!< \brief Global index for design variable markers using the config information. */
@@ -3409,6 +3413,13 @@ class CConfig {
    */
   void SetMarker_All_Deform_Mesh(unsigned short val_marker, unsigned short val_deform) { Marker_All_Deform_Mesh[val_marker] = val_deform; }
 
+  /*!
+   * \brief Set if a marker <i>val_marker</i> allows deformation at the boundary.
+   * \param[in] val_marker - Index of the marker in which we are interested.
+   * \param[in] val_interface - 0 or 1 depending if the the marker is or not a DEFORM_MESH_SYM_PLANE marker.
+   */
+  void SetMarker_All_Deform_Mesh_Sym_Plane(unsigned short val_marker, unsigned short val_deform) { Marker_All_Deform_Mesh_Sym_Plane[val_marker] = val_deform; }
+
   /*!
    * \brief Set if a in marker <i>val_marker</i> the flow load will be computed/employed.
    * \param[in] val_marker - Index of the marker in which we are interested.
@@ -3546,6 +3557,13 @@ class CConfig {
    */
   unsigned short GetMarker_All_Deform_Mesh(unsigned short val_marker) const { return Marker_All_Deform_Mesh[val_marker]; }
 
+  /*!
+   * \brief Get whether marker <i>val_marker</i> is a DEFORM_MESH_SYM_PLANE marker
+   * \param[in] val_marker - 0 or 1 depending if the the marker belongs to the DEFORM_MESH_SYM_PLANE subset.
+   * \return 0 or 1 depending if the marker belongs to the DEFORM_MESH_SYM_PLANE subset.
+   */
+  unsigned short GetMarker_All_Deform_Mesh_Sym_Plane(unsigned short val_marker) const { return Marker_All_Deform_Mesh_Sym_Plane[val_marker]; }
+
   /*!
    * \brief Get whether marker <i>val_marker</i> is a Fluid_Load marker
    * \param[in] val_marker - 0 or 1 depending if the the marker belongs to the Fluid_Load subset.
@@ -6092,6 +6110,12 @@ class CConfig {
    */
   unsigned short GetMarker_CfgFile_Deform_Mesh(string val_marker) const;
 
+  /*!
+   * \brief Get the DEFORM_MESH_SYM_PLANE information from the config definition for the marker <i>val_marker</i>.
+   * \return DEFORM_MESH_SYM_PLANE information of the boundary in the config information for the marker <i>val_marker</i>.
+   */
+  unsigned short GetMarker_CfgFile_Deform_Mesh_Sym_Plane(string val_marker) const;
+
   /*!
    * \brief Get the Fluid_Load information from the config definition for the marker <i>val_marker</i>.
    * \return Fluid_Load information of the boundary in the config information for the marker <i>val_marker</i>.
@@ -6418,6 +6442,12 @@ class CConfig {
    */
   unsigned short GetMarker_Deform_Mesh(string val_marker) const;
 
+  /*!
+   * \brief Get the internal index for a DEFORM_MESH_SYM_PLANE boundary <i>val_marker</i>.
+   * \return Internal index for a DEFORM_MESH_SYM_PLANE boundary <i>val_marker</i>.
+   */
+  unsigned short GetMarker_Deform_Mesh_Sym_Plane(string val_marker) const;
+
   /*!
    * \brief Get the internal index for a Fluid_Load boundary <i>val_marker</i>.
    * \return Internal index for a Fluid_Load boundary <i>val_marker</i>.
@@ -6440,6 +6470,14 @@ class CConfig {
    */
   string GetMarker_Deform_Mesh_TagBound(unsigned short val_marker) const { return Marker_Deform_Mesh[val_marker]; }
 
+  /*!
+   * \brief Get the name of the DEFORM_MESH_SYM_PLANE boundary defined in the geometry file.
+   * \param[in] val_marker - Value of the marker in which we are interested.
+   * \return Name that is in the geometry file for the surface that
+   *         has the marker <i>val_marker</i>.
+   */
+  string GetMarker_Deform_Mesh_Sym_Plane_TagBound(unsigned short val_marker) const { return Marker_Deform_Mesh_Sym_Plane[val_marker]; }
+
   /*!
    * \brief Get the name of the Fluid_Load boundary defined in the geometry file.
    * \param[in] val_marker - Value of the marker in which we are interested.

Common/src/CConfig.cpp

@@ -789,6 +789,7 @@ void CConfig::SetPointersNull(void) {
   Marker_CfgFile_MixingPlaneInterface = nullptr; Marker_All_MixingPlaneInterface = nullptr;
   Marker_CfgFile_ZoneInterface = nullptr;
   Marker_CfgFile_Deform_Mesh   = nullptr;  Marker_All_Deform_Mesh   = nullptr;
+  Marker_CfgFile_Deform_Mesh_Sym_Plane   = nullptr;  Marker_All_Deform_Mesh_Sym_Plane   = nullptr;
   Marker_CfgFile_Fluid_Load    = nullptr;  Marker_All_Fluid_Load    = nullptr;
 
   Marker_CfgFile_Turbomachinery       = nullptr; Marker_All_Turbomachinery       = nullptr;
@@ -814,7 +815,7 @@ void CConfig::SetPointersNull(void) {
   Marker_Euler                = nullptr;    Marker_FarField         = nullptr;    Marker_Custom         = nullptr;
   Marker_SymWall              = nullptr;    Marker_PerBound         = nullptr;
   Marker_PerDonor             = nullptr;    Marker_NearFieldBound   = nullptr;
-  Marker_Deform_Mesh          = nullptr;    Marker_Fluid_Load       = nullptr;
+  Marker_Deform_Mesh          = nullptr;    Marker_Deform_Mesh_Sym_Plane= nullptr; Marker_Fluid_Load    = nullptr;
   Marker_Inlet                = nullptr;    Marker_Outlet           = nullptr;
   Marker_Supersonic_Inlet     = nullptr;    Marker_Supersonic_Outlet= nullptr;    Marker_Smoluchowski_Maxwell   = nullptr;
   Marker_Isothermal           = nullptr;    Marker_HeatFlux         = nullptr;    Marker_EngineInflow   = nullptr;
@@ -1387,6 +1388,8 @@ void CConfig::SetConfig_Options() {
   addStringListOption("MARKER_FLUID_INTERFACE", nMarker_Fluid_InterfaceBound, Marker_Fluid_InterfaceBound);
   /*!\brief MARKER_DEFORM_MESH\n DESCRIPTION: Deformable marker(s) at the interface \ingroup Config*/
   addStringListOption("MARKER_DEFORM_MESH", nMarker_Deform_Mesh, Marker_Deform_Mesh);
+  /*!\brief MARKER_DEFORM_MESH_SYM_PLANE\n DESCRIPTION: Symmetry plane for mesh deformation only \ingroup Config*/
+  addStringListOption("MARKER_DEFORM_MESH_SYM_PLANE", nMarker_Deform_Mesh_Sym_Plane, Marker_Deform_Mesh_Sym_Plane);
   /*!\brief MARKER_FLUID_LOAD\n DESCRIPTION: Marker(s) in which the flow load is computed/applied \ingroup Config*/
   addStringListOption("MARKER_FLUID_LOAD", nMarker_Fluid_Load, Marker_Fluid_Load);
   /*!\brief MARKER_FSI_INTERFACE \n DESCRIPTION: ZONE interface boundary marker(s) \ingroup Config*/
@@ -3707,7 +3710,7 @@ void CConfig::SetPostprocessing(unsigned short val_software, unsigned short val_
   /*--- If it is not specified, set the mesh motion mach number
    equal to the freestream value. ---*/
 
-  if (GetGrid_Movement() && Mach_Motion == 0.0)
+  if (GetDynamic_Grid() && Mach_Motion == 0.0)
     Mach_Motion = Mach;
 
   /*--- Set the boolean flag if we are in a rotating frame (source term). ---*/
@@ -5042,7 +5045,7 @@ void CConfig::SetMarkers(unsigned short val_software) {
   iMarker_Monitoring, iMarker_Designing, iMarker_GeoEval, iMarker_Plotting, iMarker_Analyze,
   iMarker_DV, iMarker_Moving, iMarker_PyCustom, iMarker_Supersonic_Inlet, iMarker_Supersonic_Outlet,
   iMarker_Clamped, iMarker_ZoneInterface, iMarker_CHTInterface, iMarker_Load_Dir, iMarker_Disp_Dir, iMarker_Load_Sine,
-  iMarker_Fluid_Load, iMarker_Deform_Mesh,
+  iMarker_Fluid_Load, iMarker_Deform_Mesh, iMarker_Deform_Mesh_Sym_Plane,
   iMarker_ActDiskInlet, iMarker_ActDiskOutlet,
   iMarker_Turbomachinery, iMarker_MixingPlaneInterface;
 
@@ -5088,6 +5091,7 @@ void CConfig::SetMarkers(unsigned short val_software) {
   Marker_All_DV             = new unsigned short[nMarker_All] (); // Store whether the boundary should be affected by design variables.
   Marker_All_Moving         = new unsigned short[nMarker_All] (); // Store whether the boundary should be in motion.
   Marker_All_Deform_Mesh    = new unsigned short[nMarker_All] (); // Store whether the boundary is deformable.
+  Marker_All_Deform_Mesh_Sym_Plane = new unsigned short[nMarker_All] (); //Store wheter the boundary will follow the deformation
   Marker_All_Fluid_Load     = new unsigned short[nMarker_All] (); // Store whether the boundary computes/applies fluid loads.
   Marker_All_PyCustom       = new unsigned short[nMarker_All] (); // Store whether the boundary is Python customizable.
   Marker_All_PerBound       = new short[nMarker_All] ();          // Store whether the boundary belongs to a periodic boundary.
@@ -5112,6 +5116,7 @@ void CConfig::SetMarkers(unsigned short val_software) {
   Marker_CfgFile_DV                   = new unsigned short[nMarker_CfgFile] ();
   Marker_CfgFile_Moving               = new unsigned short[nMarker_CfgFile] ();
   Marker_CfgFile_Deform_Mesh          = new unsigned short[nMarker_CfgFile] ();
+  Marker_CfgFile_Deform_Mesh_Sym_Plane= new unsigned short[nMarker_CfgFile] ();
   Marker_CfgFile_Fluid_Load           = new unsigned short[nMarker_CfgFile] ();
   Marker_CfgFile_PerBound             = new unsigned short[nMarker_CfgFile] ();
   Marker_CfgFile_Turbomachinery       = new unsigned short[nMarker_CfgFile] ();
@@ -5511,6 +5516,13 @@ void CConfig::SetMarkers(unsigned short val_software) {
         Marker_CfgFile_Deform_Mesh[iMarker_CfgFile] = YES;
   }
 
+  for (iMarker_CfgFile = 0; iMarker_CfgFile < nMarker_CfgFile; iMarker_CfgFile++) {
+    Marker_CfgFile_Deform_Mesh_Sym_Plane[iMarker_CfgFile] = NO;
+    for (iMarker_Deform_Mesh_Sym_Plane = 0; iMarker_Deform_Mesh_Sym_Plane < nMarker_Deform_Mesh_Sym_Plane; iMarker_Deform_Mesh_Sym_Plane++)
+      if (Marker_CfgFile_TagBound[iMarker_CfgFile] == Marker_Deform_Mesh_Sym_Plane[iMarker_Deform_Mesh_Sym_Plane])
+        Marker_CfgFile_Deform_Mesh_Sym_Plane[iMarker_CfgFile] = YES;
+  }
+
   for (iMarker_CfgFile = 0; iMarker_CfgFile < nMarker_CfgFile; iMarker_CfgFile++) {
     Marker_CfgFile_Fluid_Load[iMarker_CfgFile] = NO;
     for (iMarker_Fluid_Load = 0; iMarker_Fluid_Load < nMarker_Fluid_Load; iMarker_Fluid_Load++)
@@ -5532,7 +5544,8 @@ void CConfig::SetOutput(unsigned short val_software, unsigned short val_izone) {
   unsigned short iMarker_Euler, iMarker_Custom, iMarker_FarField,
   iMarker_SymWall, iMarker_PerBound, iMarker_NearFieldBound,
   iMarker_Fluid_InterfaceBound, iMarker_Inlet, iMarker_Riemann,
-  iMarker_Deform_Mesh, iMarker_Fluid_Load, iMarker_Smoluchowski_Maxwell, iWall_Catalytic,
+  iMarker_Deform_Mesh, iMarker_Deform_Mesh_Sym_Plane, iMarker_Fluid_Load,
+  iMarker_Smoluchowski_Maxwell, iWall_Catalytic,
   iMarker_Giles, iMarker_Outlet, iMarker_Isothermal, iMarker_HeatFlux,
   iMarker_EngineInflow, iMarker_EngineExhaust, iMarker_Displacement, iMarker_Damper,
   iMarker_Load, iMarker_FlowLoad, iMarker_Internal, iMarker_Monitoring,
@@ -6821,6 +6834,15 @@ void CConfig::SetOutput(unsigned short val_software, unsigned short val_izone) {
     BoundaryTable.PrintFooter();
   }
 
+  if (nMarker_Deform_Mesh_Sym_Plane != 0) {
+    BoundaryTable << "Symmetric deformable mesh boundary";
+    for (iMarker_Deform_Mesh_Sym_Plane = 0; iMarker_Deform_Mesh_Sym_Plane < nMarker_Deform_Mesh_Sym_Plane; iMarker_Deform_Mesh_Sym_Plane++) {
+      BoundaryTable << Marker_Deform_Mesh_Sym_Plane[iMarker_Deform_Mesh_Sym_Plane];
+      if (iMarker_Deform_Mesh_Sym_Plane < nMarker_Deform_Mesh_Sym_Plane-1)  BoundaryTable << " ";
+    }
+    BoundaryTable.PrintFooter();
+  }
+
   if (nMarker_Fluid_Load != 0) {
     BoundaryTable << "Fluid loads boundary";
     for (iMarker_Fluid_Load = 0; iMarker_Fluid_Load < nMarker_Fluid_Load; iMarker_Fluid_Load++) {
@@ -7342,6 +7364,13 @@ unsigned short CConfig::GetMarker_CfgFile_Deform_Mesh(string val_marker) const {
   return Marker_CfgFile_Deform_Mesh[iMarker_CfgFile];
 }
 
+unsigned short CConfig::GetMarker_CfgFile_Deform_Mesh_Sym_Plane(string val_marker) const {
+  unsigned short iMarker_CfgFile;
+  for (iMarker_CfgFile = 0; iMarker_CfgFile < nMarker_CfgFile; iMarker_CfgFile++)
+    if (Marker_CfgFile_TagBound[iMarker_CfgFile] == val_marker) break;
+  return Marker_CfgFile_Deform_Mesh_Sym_Plane[iMarker_CfgFile];
+}
+
 unsigned short CConfig::GetMarker_CfgFile_Fluid_Load(string val_marker) const {
   unsigned short iMarker_CfgFile;
   for (iMarker_CfgFile = 0; iMarker_CfgFile < nMarker_CfgFile; iMarker_CfgFile++)
@@ -7516,6 +7545,9 @@ CConfig::~CConfig(void) {
   delete[] Marker_CfgFile_Deform_Mesh;
   delete[] Marker_All_Deform_Mesh;
 
+  delete[] Marker_CfgFile_Deform_Mesh_Sym_Plane;
+  delete[] Marker_All_Deform_Mesh_Sym_Plane;
+
   delete[] Marker_CfgFile_Fluid_Load;
   delete[] Marker_All_Fluid_Load;
 
@@ -7780,6 +7812,7 @@ CConfig::~CConfig(void) {
             delete[] Marker_PerDonor;
       delete[] Marker_NearFieldBound;
          delete[] Marker_Deform_Mesh;
+         delete[] Marker_Deform_Mesh_Sym_Plane;
           delete[] Marker_Fluid_Load;
       delete[] Marker_Fluid_InterfaceBound;
                delete[] Marker_Inlet;
@@ -8485,6 +8518,16 @@ unsigned short CConfig::GetMarker_Deform_Mesh(string val_marker) const {
   return iMarker_Deform_Mesh;
 }
 
+unsigned short CConfig::GetMarker_Deform_Mesh_Sym_Plane(string val_marker) const {
+  unsigned short iMarker_Deform_Mesh_Sym_Plane;
+
+  /*--- Find the marker for this interface boundary. ---*/
+  for (iMarker_Deform_Mesh_Sym_Plane = 0; iMarker_Deform_Mesh_Sym_Plane < nMarker_Deform_Mesh_Sym_Plane; iMarker_Deform_Mesh_Sym_Plane++)
+    if (Marker_Deform_Mesh_Sym_Plane[iMarker_Deform_Mesh_Sym_Plane] == val_marker) break;
+
+  return iMarker_Deform_Mesh_Sym_Plane;
+}
+
 unsigned short CConfig::GetMarker_Fluid_Load(string val_marker) const {
   unsigned short iMarker_Fluid_Load;
 

Common/src/geometry/CPhysicalGeometry.cpp

@@ -3593,6 +3593,7 @@ void CPhysicalGeometry::SetBoundaries(CConfig *config) {
       config->SetMarker_All_DV(iMarker, config->GetMarker_CfgFile_DV(Marker_Tag));
       config->SetMarker_All_Moving(iMarker, config->GetMarker_CfgFile_Moving(Marker_Tag));
       config->SetMarker_All_Deform_Mesh(iMarker, config->GetMarker_CfgFile_Deform_Mesh(Marker_Tag));
+      config->SetMarker_All_Deform_Mesh_Sym_Plane(iMarker, config->GetMarker_CfgFile_Deform_Mesh_Sym_Plane(Marker_Tag));
       config->SetMarker_All_Fluid_Load(iMarker, config->GetMarker_CfgFile_Fluid_Load(Marker_Tag));
       config->SetMarker_All_PyCustom(iMarker, config->GetMarker_CfgFile_PyCustom(Marker_Tag));
       config->SetMarker_All_PerBound(iMarker, config->GetMarker_CfgFile_PerBound(Marker_Tag));
@@ -3615,6 +3616,7 @@ void CPhysicalGeometry::SetBoundaries(CConfig *config) {
       config->SetMarker_All_DV(iMarker, NO);
       config->SetMarker_All_Moving(iMarker, NO);
       config->SetMarker_All_Deform_Mesh(iMarker, NO);
+      config->SetMarker_All_Deform_Mesh_Sym_Plane(iMarker, NO);
       config->SetMarker_All_Fluid_Load(iMarker, NO);
       config->SetMarker_All_PyCustom(iMarker, NO);
       config->SetMarker_All_PerBound(iMarker, NO);
@@ -4016,6 +4018,7 @@ void CPhysicalGeometry::LoadUnpartitionedSurfaceElements(CConfig        *config,
       config->SetMarker_All_DV(iMarker, config->GetMarker_CfgFile_DV(Marker_Tag));
       config->SetMarker_All_Moving(iMarker, config->GetMarker_CfgFile_Moving(Marker_Tag));
       config->SetMarker_All_Deform_Mesh(iMarker, config->GetMarker_CfgFile_Deform_Mesh(Marker_Tag));
+      config->SetMarker_All_Deform_Mesh_Sym_Plane(iMarker, config->GetMarker_CfgFile_Deform_Mesh_Sym_Plane(Marker_Tag));
       config->SetMarker_All_Fluid_Load(iMarker, config->GetMarker_CfgFile_Fluid_Load(Marker_Tag));
       config->SetMarker_All_PyCustom(iMarker, config->GetMarker_CfgFile_PyCustom(Marker_Tag));
       config->SetMarker_All_PerBound(iMarker, config->GetMarker_CfgFile_PerBound(Marker_Tag));

SU2_CFD/include/drivers/CSinglezoneDriver.hpp

@@ -7,7 +7,7 @@
  *
  * SU2 Project Website: https://su2code.github.io
  *
- * The SU2 Project is maintained by the SU2 Foundation 
+ * The SU2 Project is maintained by the SU2 Foundation
  * (http://su2foundation.org)
  *
  * Copyright 2012-2020, SU2 Contributors (cf. AUTHORS.md)
@@ -92,6 +92,11 @@ class CSinglezoneDriver : public CDriver {
    */
   void DynamicMeshUpdate(unsigned long TimeIter) override;
 
+  /*!
+   * \brief Perform a mesh deformation as initial condition.
+   */
+  void SetInitialMesh() override;
+
   /*!
    * \brief Monitor
    * \param ExtIter

SU2_CFD/src/iteration/CFluidIteration.cpp

@@ -235,7 +235,6 @@ void CFluidIteration::Postprocess(COutput* output, CIntegration**** integration,
                                   CSurfaceMovement** surface_movement, CVolumetricMovement*** grid_movement,
                                   CFreeFormDefBox*** FFDBox, unsigned short val_iZone, unsigned short val_iInst) {
   /*--- Temporary: enable only for single-zone driver. This should be removed eventually when generalized. ---*/
-
   if (config[val_iZone]->GetSinglezone_Driver()) {
     /*--- Compute the tractions at the vertices ---*/
     solver[val_iZone][val_iInst][MESH_0][FLOW_SOL]->ComputeVertexTractions(geometry[val_iZone][val_iInst][MESH_0],

SU2_CFD/src/output/COutput.cpp

@@ -1992,7 +1992,9 @@ bool COutput::WriteHistoryFile_Output(CConfig *config) {
 }
 
 bool COutput::WriteVolume_Output(CConfig *config, unsigned long Iter, bool force_writing){
-  if (config->GetTime_Domain()) return ((Iter % config->GetVolume_Wrt_Freq() == 0)) || force_writing;
+  if (config->GetTime_Domain()){
+    return ((Iter % config->GetVolume_Wrt_Freq() == 0)) || force_writing;
+  }
   else {
     return ((Iter > 0) && (Iter % config->GetVolume_Wrt_Freq() == 0)) || force_writing;
   }