# rhoCentralFoam unrealistic solution

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April 11, 2016, 06:28
rhoCentralFoam unrealistic solution
#1
New Member

Join Date: Mar 2016
Location: Germany
Posts: 3
Rep Power: 2
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.
Attached Images
 1.png (25.9 KB, 16 views) 2.png (74.3 KB, 11 views)
Attached Files
 0.tar.gz (963 Bytes, 2 views) constant.tar.gz (118.4 KB, 1 views) system.tar.gz (1.6 KB, 2 views)

 April 12, 2016, 05:33 #2 Senior Member     Tobias Holzmann Join Date: Oct 2010 Location: Leoben (Austria) Posts: 1,548 Blog Entries: 6 Rep Power: 27 Hi, is there a reason for using rhoCentralFoam? __________________ Best regards, Tobias Holzmann Some interesting OpenFOAM tutorials, publications and videos on www.Holzmann-cfd.de OpenFOAM Beginners should check out the new wiki on wiki.openfoam.com A list of some active OpenFOAM contributers can be found »here« A book about the basics of »Mathematics, Numerics, Derivations and OpenFOAM« can be found on www.Holzmann-cfd.de

 April 14, 2016, 07:13 #3 New Member   Join Date: Mar 2016 Location: Germany Posts: 3 Rep Power: 2 Hi, actually i want a compressible transient laminar and turbulence explicit solver and i thought that rhoCentralFom is the right solver.

 April 14, 2016, 07:40 #4 Senior Member     Tobias Holzmann Join Date: Oct 2010 Location: Leoben (Austria) Posts: 1,548 Blog Entries: 6 Rep Power: 27 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. __________________ Best regards, Tobias Holzmann Some interesting OpenFOAM tutorials, publications and videos on www.Holzmann-cfd.de OpenFOAM Beginners should check out the new wiki on wiki.openfoam.com A list of some active OpenFOAM contributers can be found »here« A book about the basics of »Mathematics, Numerics, Derivations and OpenFOAM« can be found on www.Holzmann-cfd.de

 Tags compressible flow, rhocentralfoam, subsonic flow

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