a question about Massflow Calculation
Hi Foamusers,
I have use rhoSimpleFoam to simulate a valve. Now I have a question about the massflow calculation. In openfoam WIKI I have found a function: http://openfoamwiki.net/index.php?ti...cts&oldid=9706 functions ( massFlow { type patchMassFlow; functionObjectLibs ( "libsimpleFunctionObjects.so" ); verbose true; patches ( inlet outlet ); factor 19.7363; } ); What I am not clear is the factor 19.7363. For My case I have use factor=1. But the massflow results I get is 30% smaller than the results simulated by another CFD software StarCCM+. In OpenFOAM WIKI, it said: factor A factor with which the results should be multiplied before being written to disk/terminal. Used to account for symmetries etc (not used by all function objects) Depending on the type of the functionObject in this library these entries are used: So can anyone tell me what means here account for symmetries? For my model I have use half of the CAD valve model to run the simulation, so I have a symmetryplane. Do I need to set this factor bigger than 1? Thanks a lot! |
hi chenkai
let me describe my point with an example. u have an axiymetric mesh (consider a tube, you choose a section of it) as ur cross section is a portion of the main cross section, ur mass will be a portion of mass flow too! so i guess im not sure at ALL! the factor equals (tube cross section/ chosen cross section) |
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