added test case and documentation

Author: baldang

SU2_CFD/src/output/filewriter/CCGNSFileWriter.cpp

@@ -65,7 +65,7 @@ void CCGNSFileWriter::Write_Data() {
   InitializeFields();
 
   const vector<string> fieldNames = dataSorter->GetFieldNames();
-  for (int i = nDim; i < fieldNames.size(); ++i) {
+  for (unsigned long i = nDim; i < fieldNames.size(); ++i) {
     WriteField(i, fieldNames[i]);
   }
 
@@ -307,4 +307,4 @@ void CCGNSFileWriter::WriteField(int iField, const string& FieldName) {
   if (rank != MASTER_NODE) SU2_MPI::Wait(&sendReq, MPI_STATUS_IGNORE);
 #endif
 }
-#endif  // HAVE_CGNS
+#endif  // HAVE_CGNS

TestCases/euler/oneram6/inv_ONERAM6.cfg

@@ -267,7 +267,7 @@ OUTPUT_WRT_FREQ= 100
 % Screen output fields
 SCREEN_OUTPUT = (INNER_ITER, RMS_DENSITY, RMS_ENERGY, LIFT, DRAG)
 %
-OUTPUT_FILES= (RESTART_ASCII)
+OUTPUT_FILES= (RESTART_ASCII, CGNS, SURFACE_CGNS)
 % ----------------------- DESIGN VARIABLE PARAMETERS --------------------------%
 %
 % Kind of deformation (TRANSLATION, ROTATION, SCALE,

config_template.cfg

@@ -1570,7 +1570,7 @@ TABULAR_FORMAT= TECPLOT
 % Files to output
 % Possible formats : (TECPLOT, TECPLOT_BINARY, SURFACE_TECPLOT,
 %  SURFACE_TECPLOT_BINARY, CSV, SURFACE_CSV, PARAVIEW, PARAVIEW_BINARY, SURFACE_PARAVIEW,
-%  SURFACE_PARAVIEW_BINARY, MESH, RESTART_BINARY, RESTART_ASCII, CGNS, STL)
+%  SURFACE_PARAVIEW_BINARY, MESH, RESTART_BINARY, RESTART_ASCII, CGNS, SURFACE_CGNS, STL)
 % default : (RESTART, PARAVIEW, SURFACE_PARAVIEW)
 OUTPUT_FILES= (RESTART, PARAVIEW, SURFACE_PARAVIEW)
 %