rhoCentralFoam unrealistic solution

medmast · April 11, 2016, 06:28

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.

Tobi · April 12, 2016, 05:33

Hi,

is there a reason for using rhoCentralFoam?

medmast · April 14, 2016, 07:13

Hi,
actually i want a compressible transient laminar and turbulence explicit solver and i thought that rhoCentralFom is the right solver.

Tobi · April 14, 2016, 07:40

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.

April 12, 2016, 05:33		#2
Tobi Super Moderator Tobias Holzmann Join Date: Oct 2010 Location: Tussenhausen Posts: 2,708 Blog Entries: 6 Rep Power: 51	Hi, is there a reason for using rhoCentralFoam? __________________ Keep foaming, Tobias Holzmann

April 14, 2016, 07:40		#4
Tobi Super Moderator Tobias Holzmann Join Date: Oct 2010 Location: Tussenhausen Posts: 2,708 Blog Entries: 6 Rep Power: 51	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. __________________ Keep foaming, Tobias Holzmann

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April 14, 2016, 07:13		#3
medmast New Member Join Date: Mar 2016 Location: Germany Posts: 8 Rep Power: 10	Hi, actually i want a compressible transient laminar and turbulence explicit solver and i thought that rhoCentralFom is the right solver.