# pipe with buoyantFoam buoyancy, boundary conditions

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 June 15, 2009, 08:58 pipe with buoyantFoam buoyancy, boundary conditions #1 Member   Join Date: Apr 2009 Location: Karlsruhe, Germany Posts: 96 Rep Power: 10 Sponsored Links Dear all, I try to simulate a pipe flow axis-symmetric. The mesh was generated in Gambit (one cell thick) and converted with fluentMeshToFoam and scaled. After it was made axis-symmetric with the application makeAxialMesh. When running with icoFoam there are no solving problems, but I want to use a heated wall with buoyancy effects, the acceleration is parallel to the pipe. And there I get no solution... The boundary layers are: * inlet Eingang * outlet Ausgang * wedge (frontAndBack) * wall (oben) * axis The Fluid is air and I try to solve without implementation of turbulence modelling. But what kind of boundary conditions are neccessary so solve. I read a lot in the forum and tested... p dimensions [1 -1 -2 0 0 0 0]; internalField uniform 100000; boundaryField { oben { type calculated; value uniform 100000; } axis { type empty; } frontAndBack { type empty; } eingang { type zeroGradient; } ausgang { type calculated; value uniform 100000; } symmetry_pos { type wedge; } symmetry_neg { type wedge; } symmetry { type empty; } } // ************************************************** *********************** pd dimensions [1 -1 -2 0 0 0 0]; internalField uniform 0; boundaryField { oben { type fixedFluxBuoyantPressure; value uniform 0; } axis { type empty; } frontAndBack { type empty; } eingang { type zeroGradient; } ausgang { type fixedFluxBuoyantPressure; value uniform 0; } symmetry_pos { type wedge; } symmetry_neg { type wedge; } symmetry { type empty; } } // ************************************************** *********************** U dimensions [0 1 -1 0 0 0 0]; internalField uniform (3 0 0); boundaryField { oben { type fixedValue; value uniform (0 0 0); } symmetry { type empty; } axis { type empty; } frontAndBack { type empty; } ausgang { type zeroGradient; } eingang { type fixedValue; value uniform (3 0 0); } symmetry_pos { type wedge; } symmetry_neg { type wedge; } } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // T dimensions [0 0 0 1 0 0 0]; internalField uniform 300; boundaryField { oben { type fixedValue; value uniform 300; } symmetry { type empty; } axis { type empty; } frontAndBack { type empty; } ausgang { type zeroGradient; } eingang { type fixedValue; value uniform 300; } symmetry_pos { type wedge; } symmetry_neg { type wedge; } } // ************************************************** *********************** // Could someone please give me a hint. Thanks a lot, Thomas Baumann

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