feat: Add new scatter strategies for initial mesh redistribution

.integrated_tests.yaml

@@ -1,6 +1,6 @@
 baselines:
   bucket: geosx
-  baseline: integratedTests/baseline_integratedTests-pr4005-17824-bac337a
+  baseline: integratedTests/baseline_integratedTests-pr4033-17830-ccd004a
 
 allow_fail:
   all: ''

BASELINE_NOTES.md

@@ -5,6 +5,10 @@ This file is designed to track changes to the integrated test baselines.
 Any developer who updates the baseline ID in the .integrated_tests.yaml file is expected to create an entry in this file with the pull request number, date, and their justification for rebaselining.
 These notes should be in reverse-chronological order, and use the following time format: (YYYY-MM-DD).
 
+PR #4033 (2026-10-24) <https://storage.googleapis.com/geosx/integratedTests/baseline_integratedTests-pr4033-17830-ccd004a.tar.gz>
+=====================
+Add new scatter strategies for initial mesh redistribution.
+
 PR #4005 (2026-10-23) <https://storage.googleapis.com/geosx/integratedTests/baseline_integratedTests-pr4005-17824-bac337a.tar.gz>
 =====================
 Added a `Group` statistics layer for sets statistics

src/coreComponents/integrationTests/meshTests/testVTKImport.cpp

@@ -153,22 +153,30 @@ void expectEmptyArrayMetadata( vtkFieldData & data, std::initializer_list< Expec
 
 template< class V >
 void TestMeshImport( string const & meshFilePath, V const & validate, string const fractureName="",
-                     int const partitionRefinement=0 )
+                     int const partitionRefinement=0, string const scatterMethod="" )
 {
   // Automatically use global IDs when fractures are present
   string const useGlobalIdsStr = fractureName.empty() ? "0" : "1";
 
+  string scatterAttr;
+  if( !scatterMethod.empty() )
+  {
+    scatterAttr = GEOS_FMT( "scatterMethod=\"{}\"", scatterMethod );
+  }
+
   string const pattern = R"xml(
     <Mesh>
       <VTKMesh
         name="mesh"
         file="{}"
         partitionRefinement="{}"
         useGlobalIds="{}"
+        {}
         {} />
     </Mesh>
   )xml";
   string const meshNode = GEOS_FMT_RUNTIME( pattern, meshFilePath, partitionRefinement, useGlobalIdsStr,
+                                            scatterAttr,
                                             fractureName.empty() ? "" : "faceBlocks=\"{" + fractureName + "}\"" );
 
   xmlWrapper::xmlDocument xmlDocument;

src/coreComponents/mesh/CMakeLists.txt

@@ -214,6 +214,7 @@ if( ENABLE_VTK )
          generators/VTKHierarchicalDataSource.hpp
          generators/VTKMeshGenerator.hpp
          generators/VTKMeshGeneratorTools.hpp
+         generators/VTKMeshScattering.hpp
          generators/VTKWellGenerator.hpp
          generators/VTKSuperCellPartitioning.hpp
          generators/VTKUtilities.hpp
@@ -224,6 +225,7 @@ if( ENABLE_VTK )
          generators/VTKHierarchicalDataSource.cpp
          generators/VTKMeshGenerator.cpp
          generators/VTKMeshGeneratorTools.cpp
+         generators/VTKMeshScattering.cpp
          generators/VTKWellGenerator.cpp
          generators/VTKSuperCellPartitioning.cpp
          generators/VTKUtilities.cpp
@@ -285,3 +287,8 @@ endif()
 if( GEOS_ENABLE_TESTS )
     add_subdirectory( unitTests )
 endif( )
+
+# Add benchmarks subdirectory
+if( ENABLE_VTK )
+    add_subdirectory( benchmarks )
+endif()

src/coreComponents/mesh/benchmarks/CMakeLists.txt

@@ -0,0 +1,15 @@
+#
+# Mesh benchmarks
+#
+
+set( dependencyList mesh ${parallelDeps} ${tplDependencyList} )
+
+blt_add_executable(
+  NAME benchmarkScatterMethods
+  SOURCES benchmarkScatterMethods.cpp
+  OUTPUT_DIR ${BENCHMARK_OUTPUT_DIRECTORY}
+  DEPENDS_ON ${dependencyList}
+  FOLDER coreComponents/mesh/benchmarks
+)
+
+install(TARGETS benchmarkScatterMethods DESTINATION ${CMAKE_INSTALL_PREFIX}/benchmarks)