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rhoCentralDyMFoam for subsonic flows

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Old   December 1, 2015, 03:59
Default rhoCentralDyMFoam for subsonic flows
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Dear all,

make it sense to use rhoCentralFoam oder rhoCentralDyMFoam for subsonic flows? So maybe for an axial fan were the maximum speed of the fan is 40 m/s so Ma No. < 0.12.

Or must I used pressure-based rhoPimpleDyMFoam for such low Mach number flows?

Thanks and Regards
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Old   December 1, 2015, 04:12
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Hi,

rescently we made hybrid Central/PISO solver which mixes schemes from rhoCentralFoam and rhoPimpleFoam. If you are interested, you can download it here
https://github.com/unicfdlab/pisoCentralFoam
and test
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Old   December 1, 2015, 04:36
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Hey Matevey,

many thanks for you very fast reply! I have download your solver and will test it. Currently I read your paper.

My stupid question would be ... can I do something (physically) wrong, if I use rhoCentralFoam or rhoCentralDyMFoam for low Machnumber flows? if yes, can you shortly explain what?

Regards
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Old   December 1, 2015, 04:46
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Quote:
Originally Posted by polo View Post

can I do something (physically) wrong, if I use rhoCentralFoam or rhoCentralDyMFoam for low Machnumber flows? if yes, can you shortly explain what?

Regards
rhoCentralFoam implements Kurganov-Tadmore scheme, which was derive for solving hyperbolic equations, but with low Mach number equations becomes elliptic, so this scheme becames invalid for incompressible flows.

Also, KT scheme is explicit and it limits timestep with the Acoustic Courant number. So, if your local speed of flow is much smaller then sonic speed, this will lead to very smal time steps

Here you can find examples of using hybrid scheme for compressor simulation:
https://github.com/unicfdlab/realLifeExamples
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Old   December 1, 2015, 06:29
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thank you very much ... I will have a deeper look in your great work... http://www.cfd-online.com/Forums/ope...ntralfoam.html

compilation in OpenFOAM 2.3.0 works without any errors ;-)
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