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Simple jet modeling with internal faces / cells

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Old   June 5, 2012, 07:09
Default Simple jet modeling with internal faces / cells
Tibor Nyers
Join Date: Jul 2010
Location: Hungary
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I would like to create a jet in a 2D simulation through the use of internal faces or cells. My simulation includes buoyant effects so the solver is buoyantBoussinesqPimpleFoam.

My first approach was to create internal faces and define a fan cyclic boundary. The setup was straightforward, the simulation started without error, but the cyclic boundary has no effect on the flow. The error can stem from the fact that there is no explicit p iterations in the solver - cavityBuoyantFan demo case

I don't know if there is any method to constraint the flux / velocity through some faces, like a flowRateInletVelocity for internal boundary.

The new feature in OpenFOAM, the source addition via sourcesProperties was my second try. I extended the selection from faces to the nearby cells and the idea is to constraint the velocity via vectorExplicitSetValue. I couldn't make it work unfortunately, with vectorExplicitSource the simulation runs fine, but with SetValue it blows up within a few iterations. Tested the concept with simpleFoam, source handling is not implemented in buoyantBoussinesqPimpleFoam. I must say that I'm not 100% sure that this is a viable way of prescribing the velocity in certain cells, and it's physically correct - cavityFieldSource demo case

Attached Files
File Type: gz cavityBuoyantFan.tar.gz (3.1 KB, 12 views)
File Type: gz cavityFieldSource.tar.gz (2.9 KB, 13 views)
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2d sim, buoyant, jet fan

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