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I got complete different results for pisofoam and pimplefoam?

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Old   December 14, 2011, 18:47
Default I got complete different results for pisofoam and pimplefoam?
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I got completely different results for pisofoam and pimplefoam.

"completely" means, the resulting strouhal numbers are so different, as the former is almost twice bigger than the second.

2D and 3D are all tested, and also with a variety of turb models, etc.

All the other settings are the same.

I am very surprised.
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Old   December 14, 2011, 22:00
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Quote:
Originally Posted by lakeat View Post
I got completely different results for pisofoam and pimplefoam.

"completely" means, the resulting strouhal numbers are so different, as the former is almost twice bigger than the second.

2D and 3D are all tested, and also with a variety of turb models, etc.

All the other settings are the same.

I am very surprised.
It seems that pisoFoam is a totally transient, the simulation results are the resultes on time point. PimpleSimpleFoam is not a totally transient, it has a relaxation on each time step, thus, the results should be the average results over a given time step.

Junwei
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Old   December 14, 2011, 22:09
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There might be a bug in pisofoam, the one I downloaded. I am double-checking it.
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Old   November 7, 2012, 15:19
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Hello!

I am interested in the comparison ... did you find out what is wrong??
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Old   December 26, 2012, 22:28
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Quote:
Originally Posted by lakeat View Post
I got completely different results for pisofoam and pimplefoam.

"completely" means, the resulting strouhal numbers are so different, as the former is almost twice bigger than the second.

2D and 3D are all tested, and also with a variety of turb models, etc.

All the other settings are the same.

I am very surprised.
What case did you take, flow past over a circular cylinder? Could you show the results to me?
Thank you.

Zhou Qiang
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Old   December 27, 2012, 03:26
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Hello Zhou,

I got a similar problem here (cases are included):
pimpleFoam: turbulence->correct(); is not executed when using residualControl

here is another report of a similar problem too:
Calculation of k and epsilon freezes

I hope that can help solve the problem..
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Old   December 27, 2012, 05:25
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Hi, hfs

sorry, I cannot help you since I am not familiar to RAS model.
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