Turn OUTPUT_WRT_FREQ error for disc. adj. multizone into a warning.

Author: oleburghardt

Common/include/CConfig.hpp

@@ -9605,6 +9605,11 @@ class CConfig {
    */
   unsigned short GetnVolumeOutputFiles() const { return nVolumeOutputFiles; }
 
+  /*!
+   * \brief GetnVolumeOutputFrequencies
+   */
+  unsigned short GetnVolumeOutputFrequencies() const { return nVolumeOutputFrequencies; }
+
   /*!
    * \brief GetVolumeOutputFrequency
    * \param[in] iFile: index of file number for which the writing frequency needs to be returned.

Common/src/CConfig.cpp

@@ -3418,16 +3418,12 @@ void CConfig::SetPostprocessing(SU2_COMPONENT val_software, unsigned short val_i
     /*---  Using default frequency of 250 for all files when steady, and 1 for unsteady. ---*/
     for (auto iVolumeFreq = 0; iVolumeFreq < nVolumeOutputFrequencies; iVolumeFreq++){
       if (Multizone_Problem && DiscreteAdjoint) {
-        VolumeOutputFrequencies[iVolumeFreq] = nOuterIter;
+        VolumeOutputFrequencies[iVolumeFreq] = Time_Domain ? 1 : nOuterIter;
       }
       else {
         VolumeOutputFrequencies[iVolumeFreq] = Time_Domain ? 1 : 250;
       }
     }
-  } else if (Multizone_Problem && DiscreteAdjoint) {
-      SU2_MPI::Error(string("OUTPUT_WRT_FREQ cannot be specified for this solver "
-                            "(writing of restart and sensitivity files not possible for multizone discrete adjoint during runtime yet).\n"
-                            "Please remove this option from the config file, output files will be written when solver finalizes.\n"), CURRENT_FUNCTION);
   } else if (nVolumeOutputFrequencies < nVolumeOutputFiles) {
     /*--- If there are fewer frequencies than files, repeat the last frequency.
      *    This is useful to define 1 frequency for the restart file and 1 frequency for all the visualization files.  ---*/

SU2_CFD/src/drivers/CDiscAdjMultizoneDriver.cpp

@@ -344,6 +344,21 @@ void CDiscAdjMultizoneDriver::Run() {
   const bool time_domain = driver_config->GetTime_Domain();
   driver_config->Set_StartTime(SU2_MPI::Wtime());
 
+  /*--- Temporary warning because we need to test writing intermediate output to file (requires re-recording). ---*/
+  for(iZone = 0; iZone < nZone; iZone++) {
+    for (auto iVolumeFreq = 0; iVolumeFreq < config_container[iZone]->GetnVolumeOutputFrequencies(); iVolumeFreq++){
+      if (config_container[iZone]->GetVolumeOutputFrequency(iVolumeFreq) < nOuterIter) {
+        if (rank == MASTER_NODE) {
+          cout << "\nWARNING (iZone = " << iZone
+               << "): "
+                  "Writing out restart files during solver iterations is not tested for the discrete adjoint multizone solver.\n"
+                  "It is recommended to remove OUTPUT_WRT_FREQ from the config file, output files will be written when solver finalizes." << std::endl;
+        }
+        break;
+      }
+    }
+  }
+
   /*--- If the gradient of the objective function is 0 so are the adjoint variables.
    * Unless in unsteady problems where there are other contributions to the RHS. ---*/