overPimpleDyMFoam does not satisfy the mass conservation betwee inlet and outlet -- CFD Online Discussion Forums

July 7, 2018, 05:23

overPimpleDyMFoam does not satisfy the mass conservation betwee inlet and outlet

mAlletto

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Michael Alletto

Join Date: Jun 2018

Location: Bremen

Posts: 615

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Hello all,

I have a very simple test case. It is a 2D cylinder bounded by two fixed wall (top and bottom) and pressure inlet and outlet. The flow is laminar. When starting to move the cylinder periodically (the fluid is initially at rest) in direction of the inlet and outlet i realized by monitoring the mass fluxes at the inlet and the outlet that they are not equal in magnitude. So i was wondering if I have something wrong in the setup or there is an issue in the pressure equation (which should guarantee the mass conservation.

Please find attached the case. Maybe someone can give me a hint what's going wrong

Attached Files

OcilatingCylinderinFluidAtRestSend.tar.gz (14.1 KB, 5 views)

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