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- - **Stationary Stokes flow with FVM**
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Stationary Stokes flow with FVMHi everybody,
at the moment I am trying to implement a stationary Stokes solver in Matlab for a simple geometry. I am using the FVM with midpoint rule and CDS. In the pressure field I get oscillations. How can I circumvent this problem on a collocated grid? Any idea? Thanks in advance! Kind regards Christoph |

Dear Christoph,
you need to do Rhie & Chow interpolation to avoid pressure-velocity decoupling on collocated grids. http://www.tfd.chalmers.se/~hani/kurser/OS_CFD_2007/rhiechow.pdf Reference to original paper: http://powerlab.fsb.hr/ped/kturbo/Op...jeJasakPhD.pdf Henrik |

Quote:
I suppose the Rhie-Chow interpolation mentioned by Fabian Peng Karrholm does not exist in Openfoam at all. According to Rhie-Chow interpolation, we should have interpolation for U and p on surface respectively. I have felt puzzled for a long time about how to make it in openfoam. I tried this: volScalarField Vmesh=mesh.V() phi=fvc::interpolate(U) & mesh.Sf() - pEqn.flux() + fvc::snGrad(p) * fvc::interpolate(Vmesh); I suppose these three above items are what Rhie-Chow interpolation is, but the compiling of it failed. I don't know why and how to correct it. Could you do me a favor? |

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