When specifying a source term using fvOptions in OpenFOAM, we can select the selectionMode (how to set the source region) from the following four options:
- points
- cellSet
- cellZone
- all
These options are defined in the cellSetOption class along with the other common parameters among the fvOptions such as timeStart and duration. Let’s check out the meaning of each option along with its source code.
| selectionMode 1: points |
In this case, we specify some points as shown in the following example. The source region consists of the individual cells that contain the specified points.
- Example of description
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selectionMode points; points ( (-0.01 0.01 0) (0.03 -0.015 0) ); |
- Source code
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void Foam::fv::cellSetOption::setCellSet() { switch (selectionMode_) { case smPoints: { Info<< indent << "- selecting cells using points" << endl; labelHashSet selectedCells; forAll(points_, i) { label celli = mesh_.findCell(points_[i]); if (celli >= 0) { selectedCells.insert(celli); } label globalCelli = returnReduce(celli, maxOp<label>()); if (globalCelli < 0) { WarningInFunction << "Unable to find owner cell for point " << points_[i] << endl; } } cells_ = selectedCells.toc(); break; } |
| selectionMode 2: cellSet |
In this case, we preliminarily create a cellSet corresponding to the source region using OpenFOAM’s utilities such as setSet and specify the created cellSet name.
- Example of description
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selectionMode cellSet; cellSet cSet1; |
- Source code
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case smCellSet: { Info<< indent << "- selecting cells using cellSet " << cellSetName_ << endl; cellSet selectedCells(mesh_, cellSetName_); cells_ = selectedCells.toc(); break; } |
| selectionMode 3: cellZone |
In this case, we preliminarily create a cellZone corresponding to the source region using OpenFOAM’s utilities such as setSet and specify the created cellZone name.
- Example of description
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selectionMode cellZone; cellZone cZone1; |
- Source code
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case smCellZone: { Info<< indent << "- selecting cells using cellZone " << cellSetName_ << endl; label zoneID = mesh_.cellZones().findZoneID(cellSetName_); if (zoneID == -1) { FatalErrorInFunction << "Cannot find cellZone " << cellSetName_ << endl << "Valid cellZones are " << mesh_.cellZones().names() << exit(FatalError); } cells_ = mesh_.cellZones()[zoneID]; break; } |
| selectionMode 4: all |
The source region is the entire computational domain.
- Example of description
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selectionMode all; |
- Source code
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case smAll: { Info<< indent << "- selecting all cells" << endl; cells_ = identity(mesh_.nCells()); break; } |