Reservoir Coupling: Fix sync of group data to only occur on first substep #6704
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hakonhagland
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The master-slave synchronization code in beginTimeStep() was executing on every internal substep within a "sync" timestep. This is incorrect because: 1. The SubStepIteration loop typically splits a sync timestep into multiple smaller internal substeps for numerical stability 2. After the first internal substep, master and slaves are at different simulation times and cannot exchange data correctly 3. Repeated sync attempts would cause deadlocks or incorrect data This fix adds an isFirstSubstepOfSyncTimestep flag to track whether we are at the start of a coordinated "sync" timestep. The flag is: - Set to true before each SubStepIteration::run() call - Cleared to false after the first runSubStep_() returns
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blattms
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Jan 8, 2026
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Approved.
Just running jenkins again as the data is gone already.
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The master-slave group data synchronization code in
BlackoilWellModel::beginTimeStep()was executing on every internal substep within a larger "sync" timestep (as assigned by the master process so as not to overshoot any slavereport dates). This is incorrect because:
SubStepIterationloop typically splits a sync timestep into multiple smaller internal substeps for numerical stability. And/or a timestep might be chopped in case of convergence problems.This fix adds an
isFirstSubstepOfSyncTimestep()flag to track whether we are at the start of a coordinated "sync" timestep. The flag is:SubStepIteration::run()callrunSubStep_()returns.