su2code · bigfooted · Sep 13, 2026 · Sep 11, 2026 · Sep 11, 2026 · Sep 13, 2026
diff --git a/SU2_CFD/include/output/filewriter/CParallelDataSorter.hpp b/SU2_CFD/include/output/filewriter/CParallelDataSorter.hpp
@@ -109,7 +109,6 @@ class CParallelDataSorter{
   nRecvs;                              //!< Number of receives
 
   vector<string> fieldNames;           //!< Vector with names of all the output fields
-  vector<string> requiredFieldNames;   //!< Vector with names of the required output fields that we write to file
 
   unsigned short nDim;                 //!< Spatial dimension of the data
 
@@ -341,22 +340,6 @@ class CParallelDataSorter{
     return fieldNames;
   }
 
- /*!
-   * \brief Get the vector containing the names of the required output fields
-   * \return Vector of strings containing the required field names
-   */
-  const vector<string>& GetRequiredFieldNames() const{
-    return requiredFieldNames;
-  }
-
-  /*!
-   * \brief Set the vector of required output fields.
-   * \return None.
-   */
-  void SetRequiredFieldNames(const vector<string>& req_field_names) {
-    requiredFieldNames = req_field_names;
-  }
-
   /*!
    * \brief Get the spatial dimension
    * \return The spatial dimension

diff --git a/SU2_CFD/src/output/COutput.cpp b/SU2_CFD/src/output/COutput.cpp
@@ -411,10 +411,6 @@ void COutput::WriteToFile(CConfig *config, CGeometry *geometry, OUTPUT_TYPE form
       if (!config->GetWrt_Surface_Overwrite())
         filename_iter = config->GetFilename_Iter(fileName, curInnerIter, curOuterIter);
 
-      /*--- If we have compact restarts, we use only the required fields. ---*/
-      if (config->GetWrt_Restart_Compact())
-        surfaceDataSorter->SetRequiredFieldNames(requiredVolumeFieldNames);
-
       surfaceDataSorter->SortConnectivity(config, geometry);
       surfaceDataSorter->SortOutputData();
 
@@ -435,9 +431,8 @@ void COutput::WriteToFile(CConfig *config, CGeometry *geometry, OUTPUT_TYPE form
 
       LogOutputFiles("SU2 ASCII restart");
 
+      /*--- If we have compact restarts, we use only the required fields. ---*/
       if (config->GetWrt_Restart_Compact()) {
-        /*--- If we have compact restarts, we use only the required fields. ---*/
-        volumeDataSorterCompact->SetRequiredFieldNames(requiredVolumeFieldNames);
         fileWriter = new CSU2FileWriter(volumeDataSorterCompact);
       } else {
         fileWriter = new CSU2FileWriter(volumeDataSorter);
@@ -456,9 +451,8 @@ void COutput::WriteToFile(CConfig *config, CGeometry *geometry, OUTPUT_TYPE form
         filename_iter = config->GetFilename_Iter(fileName, curInnerIter, curOuterIter);
 
       LogOutputFiles("SU2 binary restart");
+      /*--- If we have compact restarts, we use only the required fields. ---*/
       if (config->GetWrt_Restart_Compact()) {
-        /*--- If we have compact restarts, we use only the required fields. ---*/
-        volumeDataSorterCompact->SetRequiredFieldNames(requiredVolumeFieldNames);
         fileWriter = new CSU2BinaryFileWriter(volumeDataSorterCompact);
       } else {
         fileWriter = new CSU2BinaryFileWriter(volumeDataSorter);

diff --git a/SU2_CFD/src/output/filewriter/CParallelDataSorter.cpp b/SU2_CFD/src/output/filewriter/CParallelDataSorter.cpp
@@ -32,8 +32,7 @@
 CParallelDataSorter::CParallelDataSorter(CConfig *config, const vector<string> &valFieldNames) :
   rank(SU2_MPI::GetRank()),
   size(SU2_MPI::GetSize()),
-  fieldNames(valFieldNames),
-  requiredFieldNames(valFieldNames) {
+  fieldNames(valFieldNames) {
 
   GlobalField_Counter = fieldNames.size();
 

diff --git a/SU2_CFD/src/output/filewriter/CSU2BinaryFileWriter.cpp b/SU2_CFD/src/output/filewriter/CSU2BinaryFileWriter.cpp
@@ -41,7 +41,7 @@ void CSU2BinaryFileWriter::WriteData(string val_filename){
 
   unsigned short iVar;
 
-  const vector<string>& fieldNames = dataSorter->GetRequiredFieldNames();
+  const vector<string>& fieldNames = dataSorter->GetFieldNames();
   unsigned short nVar = fieldNames.size();
   unsigned long nParallel_Poin = dataSorter->GetnPoints();
   unsigned long nPoint_Global = dataSorter->GetnPointsGlobal();

diff --git a/SU2_CFD/src/output/filewriter/CSU2FileWriter.cpp b/SU2_CFD/src/output/filewriter/CSU2FileWriter.cpp
@@ -35,7 +35,7 @@ CSU2FileWriter::CSU2FileWriter(CParallelDataSorter *valDataSorter) :
 void CSU2FileWriter::WriteData(string val_filename){
 
   ofstream restart_file;
-  const vector<string> fieldNames = dataSorter->GetRequiredFieldNames();
+  const vector<string>& fieldNames = dataSorter->GetFieldNames();
 
   /*--- We append the pre-defined suffix (extension) to the filename (prefix) ---*/
   val_filename.append(fileExt);

diff --git a/TestCases/parallel_regression.py b/TestCases/parallel_regression.py
@@ -1750,6 +1750,23 @@ def main():
     species2_primitiveVenturi.test_vals = [-5.470699, -4.435379, -4.486544, -5.327925, -0.866369, -5.623281, 5.000000, -0.557915, 5.000000, -2.599732, 5.000000, -0.536608, 0.000037, 0.000037, 0.000000, 0.000000]
     test_list.append(species2_primitiveVenturi)
 
+    # Compact restart check. The case above writes a compact ASCII and binary restart file at
+    # iteration 49, holding the solution that enters iteration 50. The first iteration of these
+    # restarted runs must therefore reproduce its iteration 50, so they share its test values.
+    species2_compact_restart_ascii           = TestCase('species2_primitiveVenturi_compact_restart_read_ascii')
+    species2_compact_restart_ascii.cfg_dir   = "species_transport/venturi_primitive_3species"
+    species2_compact_restart_ascii.cfg_file  = "species2_primitiveVenturi_compact_restart_read_ascii.cfg"
+    species2_compact_restart_ascii.test_iter = 0
+    species2_compact_restart_ascii.test_vals = species2_primitiveVenturi.test_vals
+    test_list.append(species2_compact_restart_ascii)
+
+    species2_compact_restart_binary           = TestCase('species2_primitiveVenturi_compact_restart_read_binary')
+    species2_compact_restart_binary.cfg_dir   = "species_transport/venturi_primitive_3species"
+    species2_compact_restart_binary.cfg_file  = "species2_primitiveVenturi_compact_restart_read_binary.cfg"
+    species2_compact_restart_binary.test_iter = 0
+    species2_compact_restart_binary.test_vals = species2_primitiveVenturi.test_vals
+    test_list.append(species2_compact_restart_binary)
+
     # 2 species (1 eq) primitive venturi mixing with bounded scalar transport
     species_primitiveVenturi_boundedscalar             = TestCase('species2_primitiveVenturi_bounded_scalar')
     species_primitiveVenturi_boundedscalar.cfg_dir     = "species_transport/venturi_primitive_3species"

diff --git a/TestCases/species_transport/venturi_primitive_3species/README.md b/TestCases/species_transport/venturi_primitive_3species/README.md
@@ -21,6 +21,12 @@ t
 4. Adjoint simulation with 1 timestep, using the primal restart file from simulation in 2nd step. The printed direct residuals are taken for comparison
 
 
+- `species2_primitiveVenturi_compact_restart_read_ascii.cfg` and `species2_primitiveVenturi_compact_restart_read_binary.cfg` check that compact restart files (`WRT_RESTART_COMPACT= YES`) are written and read correctly.
+They restart from the files that `species2_venturiPrimitive.cfg` writes at iteration 49 (`WRT_RESTART_OVERWRITE= NO` with `OUTPUT_WRT_FREQ= 49, 49, 1000`), which hold the solution that enters iteration 50.
+Their first iteration must therefore reproduce the residuals of iteration 50 of that case, and the regression test uses its values for all three cases.
+`VOLUME_OUTPUT` contains fields outside the compact set, which is the situation in which the compact writers can shift the restart columns.
+
+
 - `species3_venturiPrimitive_inletFile.cfg` With the `test_inlet_files.sh` a simple sanity check for inlet files is performed.
 SU2 writes an `example_inlet_file.dat` when the specified inlet file is not available, with the values of the specified `MARKER_INLET` content.
 Therefore comparing a simulation with this example inlet file and without inlet files should result in exactly the same results.

diff --git a/TestCases/species_transport/venturi_primitive_3species/species2_primitiveVenturi.cfg b/TestCases/species_transport/venturi_primitive_3species/species2_primitiveVenturi.cfg
@@ -119,9 +119,15 @@ SCREEN_WRT_FREQ_INNER= 10
 HISTORY_OUTPUT= RMS_RES FLOW_COEFF LINSOL SPECIES_COEFF SPECIES_COEFF_SURF
 MARKER_ANALYZE= outlet gas_inlet air_axial_inlet
 %
-OUTPUT_FILES= RESTART_ASCII, PARAVIEW_MULTIBLOCK
+% The restart files written at iteration 49 hold the solution that enters
+% iteration 50 and are the starting point of the compact restart checks in
+% species2_primitiveVenturi_compact_restart_read_ascii.cfg and
+% species2_primitiveVenturi_compact_restart_read_binary.cfg.
+OUTPUT_FILES= RESTART_ASCII, RESTART, PARAVIEW_MULTIBLOCK
 VOLUME_OUTPUT= RESIDUAL, PRIMITIVE
-OUTPUT_WRT_FREQ= 1000
+WRT_RESTART_COMPACT= YES
+WRT_RESTART_OVERWRITE= NO
+OUTPUT_WRT_FREQ= 49, 49, 1000
 %
 RESTART_SOL= NO
 SOLUTION_FILENAME= solution

diff --git a/...sport/venturi_primitive_3species/species2_primitiveVenturi_compact_restart_read_ascii.cfg b/...sport/venturi_primitive_3species/species2_primitiveVenturi_compact_restart_read_ascii.cfg
@@ -0,0 +1,140 @@
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%                                                                              %
+% SU2 configuration file                                                       %
+% Case description: Species mixing with 2 species, i.e. 1 transport equations  %
+%                   restarted from the compact ASCII restart file of           %
+%                   species2_primitiveVenturi.cfg                              %
+% Author: N. Beishuizen                                                        %
+% Institution: TU Eindhoven                                                    %
+% Date: 13-09-2026                                                             %
+% File Version 8.5.0 "Harrier"                                                 %
+%                                                                              %
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+% This run restarts from the solution that entered iteration 50 of
+% species2_primitiveVenturi.cfg, so its first iteration must reproduce the
+% residuals printed at iteration 50 of that case. VOLUME_OUTPUT there holds
+% fields outside the compact set, which is what the compact writers can get
+% wrong.
+
+% ------------- DIRECT, ADJOINT, AND LINEARIZED PROBLEM DEFINITION ------------%
+%
+SOLVER= INC_RANS
+KIND_TURB_MODEL= SST
+%
+% ---------------- INCOMPRESSIBLE FLOW CONDITION DEFINITION -------------------%
+%
+INC_DENSITY_MODEL= CONSTANT
+INC_DENSITY_INIT= 1.1766
+%
+INC_VELOCITY_INIT= ( 1.00, 0.0, 0.0 )
+%
+INC_ENERGY_EQUATION= YES
+INC_TEMPERATURE_INIT= 300.0
+%
+INC_NONDIM= DIMENSIONAL
+%
+% -------------------- FLUID PROPERTIES ------------------------------------- %
+%
+FLUID_MODEL= CONSTANT_DENSITY
+%
+CONDUCTIVITY_MODEL= CONSTANT_CONDUCTIVITY
+THERMAL_CONDUCTIVITY_CONSTANT= 0.0357
+%
+PRANDTL_LAM= 0.72
+TURBULENT_CONDUCTIVITY_MODEL= NONE
+PRANDTL_TURB= 0.90
+%
+VISCOSITY_MODEL= CONSTANT_VISCOSITY
+MU_CONSTANT=  1.716E-5
+%
+% -------------------- BOUNDARY CONDITION DEFINITION --------------------------%
+%
+MARKER_HEATFLUX= ( wall, 0.0 )
+MARKER_SYM= ( axis )
+%
+INC_INLET_TYPE=  VELOCITY_INLET VELOCITY_INLET
+MARKER_INLET= ( gas_inlet,       300, 1.0, 1.0,  0.0, 0.0,\
+                air_axial_inlet, 300, 1.0, 0.0, -1.0, 0.0 )
+MARKER_INLET_SPECIES= (gas_inlet,       1.0,\
+                       air_axial_inlet, 0.6 )
+%
+INC_OUTLET_TYPE= PRESSURE_OUTLET
+MARKER_OUTLET= ( outlet, 0.0)
+%
+% ------------- COMMON PARAMETERS DEFINING THE NUMERICAL METHOD ---------------%
+%
+NUM_METHOD_GRAD= WEIGHTED_LEAST_SQUARES
+%
+CFL_NUMBER= 2000
+CFL_REDUCTION_SPECIES= 1.0
+CFL_REDUCTION_TURB= 1.0
+%
+ITER= 1
+%
+% ------------------------ LINEAR SOLVER DEFINITION ---------------------------%
+%
+LINEAR_SOLVER= FGMRES
+LINEAR_SOLVER_PREC= ILU
+LINEAR_SOLVER_ERROR= 1E-8
+LINEAR_SOLVER_ITER= 5
+%
+% -------------------- FLOW NUMERICAL METHOD DEFINITION -----------------------%
+%
+CONV_NUM_METHOD_FLOW= FDS
+MUSCL_FLOW= YES
+SLOPE_LIMITER_FLOW = NONE
+TIME_DISCRE_FLOW= EULER_IMPLICIT
+%
+% -------------------- SCALAR TRANSPORT ---------------------------------------%
+%
+KIND_SCALAR_MODEL= SPECIES_TRANSPORT
+DIFFUSIVITY_MODEL= CONSTANT_DIFFUSIVITY
+DIFFUSIVITY_CONSTANT= 0.001
+%
+CONV_NUM_METHOD_SPECIES= SCALAR_UPWIND
+MUSCL_SPECIES= NO
+SLOPE_LIMITER_SPECIES = NONE
+%
+TIME_DISCRE_SPECIES= EULER_IMPLICIT
+%
+SPECIES_INIT= 1.0
+SPECIES_CLIPPING= YES
+SPECIES_CLIPPING_MIN= 0.0
+SPECIES_CLIPPING_MAX= 1.0
+%
+% -------------------- TURBULENT TRANSPORT ---------------------------------------%
+%
+CONV_NUM_METHOD_TURB= SCALAR_UPWIND
+MUSCL_TURB= NO
+%
+% --------------------------- CONVERGENCE PARAMETERS --------------------------%
+%
+CONV_FIELD= RMS_PRESSURE, RMS_VELOCITY-X, RMS_VELOCITY-Y, RMS_TKE, RMS_SPECIES
+CONV_RESIDUAL_MINVAL= -18
+CONV_STARTITER= 10
+%
+% ------------------------- INPUT/OUTPUT INFORMATION --------------------------%
+%
+MESH_FILENAME= primitiveVenturi.su2
+SCREEN_OUTPUT= INNER_ITER WALL_TIME \
+               RMS_PRESSURE RMS_VELOCITY-X RMS_VELOCITY-Y RMS_TKE RMS_DISSIPATION RMS_SPECIES_0 \
+               LINSOL_ITER LINSOL_RESIDUAL \
+               LINSOL_ITER_TURB LINSOL_RESIDUAL_TURB \
+               LINSOL_ITER_SPECIES LINSOL_RESIDUAL_SPECIES SURFACE_SPECIES_VARIANCE
+SCREEN_WRT_FREQ_INNER= 10
+%
+HISTORY_OUTPUT= RMS_RES FLOW_COEFF LINSOL SPECIES_COEFF SPECIES_COEFF_SURF
+MARKER_ANALYZE= outlet gas_inlet air_axial_inlet
+%
+OUTPUT_FILES= RESTART_ASCII
+VOLUME_OUTPUT= RESIDUAL, PRIMITIVE
+WRT_RESTART_COMPACT= YES
+OUTPUT_WRT_FREQ= 1000
+%
+RESTART_SOL= YES
+READ_BINARY_RESTART= NO
+SOLUTION_FILENAME= restart_000049
+RESTART_FILENAME= restart_compact_read_ascii
+%
+WRT_PERFORMANCE= YES