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Mass flow through arbitrary holes not on a boundary |
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May 18, 2015, 08:03 |
Mass flow through arbitrary holes not on a boundary
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#1 |
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Chenelle Basson
Join Date: May 2014
Location: South Africa
Posts: 5
Rep Power: 12 |
Hi!
I'm simulating the flow through a micro gas turbine engine combustion chamber in order to determine the mass flow distribution through the different sets of holes. My simulation runs and I am able to get results and convergence. The only problem I have is obtaining the mass flow or surface averaged velocity through the holes, because they are not on a boundary. Please see attached image for reference. I have tried many things and I am still unable to determine the mass flow through these holes. My first attempt was to try and define a plane per hole in the controlDict file and then limit the plane to the hole's diameter. Here is the code: Code:
functions { A1 { type faceSource; functionObjectLibs ("libfieldFunctionObjects.so"); enabled true; outputControl outputTime; log true; valueOutput true; source sampledSurface; surfaceFormat vtk; sampledSurfaceDict//faceZoneDict// { type plane; // always triangulated basePoint (-0.040571 -0.0233665 -0.1528); normalVector (-0.040571 -0.0233665 0); zone A11; } operation areaAverage; fields ( U ); } }; // ************************************************************************* // Code:
actions ( { name A11; type cellSet; action new; source cylinderToCell; sourceInfo { p1 (-0.040874 -0.023541 -0.1528); p2 (-0.040268 -0.023192 -0.1528); radius 0.0008; } } ) Another approach I took was to create concetric rings as baffles around the combustor where each of the sets of holes are located using snappyHexMesh (as this is how the entire geometry is meshed). The patches are created, but now the simulation won't run, because they demand that I define a boundary condition on those patches. Please see attached picture . I tried defining a cyclic condition on the master and slave patches, but I am unable to. Any help in this regard would be greatly appreciated. Regards, Chenelle |
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October 13, 2015, 04:46 |
Solution
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#2 |
New Member
Chenelle Basson
Join Date: May 2014
Location: South Africa
Posts: 5
Rep Power: 12 |
Hello!
I have found a solution to my problem in the following post: http://www.cfd-online.com/Forums/ope...tml#post567870 |
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mass flow, surface averaged velocity |
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