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Switch default load balancer to Zoltan with vertex = all cells of a well

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The new loadbalancer approach will create a graph representing the grid
where all cells that a well perforates are represented by one
vertex. The weight of that cell will be the number of cells it
represents. Also the weights of the faces will be added up due to the
merging of cells. A cell that is not perforated by any well is still
represented by one vertex with weight one.

In the old default appoach the number of vertices in the grid was
equal to the number of cells. Vertex weights were not used. For each
well we added an edge between all its perforated cells for which we
did set a very edge weight to force the cells to the same process
during partitioning.

For realistic cases we have seen improvements across the board due to
this. E.g. this resolved convergence issues on hard cases. Because of
that this becomes the default with this.
This commit is contained in:
Markus Blatt 2024-12-13 14:42:22 +01:00
parent fb6b0cc050
commit c9b34a2f68
2 changed files with 4 additions and 3 deletions
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2
opm/simulators/flow/FlowGenericVanguard.cpp
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@ -425,7 +425,7 @@ void FlowGenericVanguard::registerParameters_()
("Order cells owned by rank before ghost/overlap cells.");
#if HAVE_MPI
Parameters::Register<Parameters::PartitionMethod>
("Choose partitioning strategy: 0=simple, 1=Zoltan, 2=METIS.");
("Choose partitioning strategy: 0=simple, 1=Zoltan, 2=METIS, 3=Zoltan with all cells of well represented by one vertex.");
Parameters::Register<Parameters::SerialPartitioning>
("Perform partitioning for parallel runs on a single process.");
Parameters::Register<Parameters::ZoltanImbalanceTol<Scalar>>

5
opm/simulators/flow/FlowGenericVanguard.hpp
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@ -71,8 +71,9 @@ struct OwnerCellsFirst { static constexpr bool value = true; };
struct ParsingStrictness { static constexpr auto value = "normal"; };
struct ActionParsingStrictness { static constexpr auto value = "normal"; };
// 0: simple, 1: Zoltan, 2: METIS, see GridEnums.hpp
struct PartitionMethod { static constexpr int value = 1; };
/// 0: simple, 1: Zoltan, 2: METIS, 3: Zoltan with a all cells of a well
/// represented by one vertex in the graph, see GridEnums.hpp
struct PartitionMethod { static constexpr int value = 3; };
struct SchedRestart{ static constexpr bool value = false; };
struct SerialPartitioning{ static constexpr bool value = false; };