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rhoCentralFoam unrealistic solution

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Old   April 11, 2016, 06:28
Default rhoCentralFoam unrealistic solution
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Hi everyone,
i'm trying to simulate a pipe in 2d, i use the tutorial case "forwardStep" and i changed just the geometry and i set the B.C. same as "forwardStep"(except pressure), wich are attached. I get a unrealistic solution: since my geometry and boundary conditions are symmetric, I would expect a symmetric solution. However, I obtain hotspots in velocity and pressure along the domain in transversal direction, which I cannot explain.
Could anyone help me please? I will be thankful for it.

i uploaded my setup. thank you very much.
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Old   April 12, 2016, 05:33
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Hi,

is there a reason for using rhoCentralFoam?
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Old   April 14, 2016, 07:13
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Hi,
actually i want a compressible transient laminar and turbulence explicit solver and i thought that rhoCentralFom is the right solver.
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Old   April 14, 2016, 07:40
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Hello,

rhoCentralFoam is:

Code:
Density-based compressible flow solver based on central-upwind schemes  of Kurganov and Tadmor
I would prefer the rhoPimpleFoam solver for your case. I never used the solver you are using and therefore I can not tell you what is the differences between both. Maybe some special pressure-velocity coupling? Don't know but I recommend PIMPLE for your case. At least you can use PIMPLE in PISO mode too.
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compressible flow, rhocentralfoam, subsonic flow

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