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Old   June 22, 2010, 02:55
Default Boundary condition - FFT
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Boundary condition - FFT

I am working on simulating a two-phase flow 3-D fluidized bed. It is a granular flow interacting with gas.

When I created my mesh, the bottom part was declared as a “velocity-inlet”. Mainly walls on the sides and the top part is the outlet.

My question is:

I am not sure if I should declare it as “outflow” or “pressure-outlet”.

Can somebody tell what is more appropriate and explain me the difference between them?

The reason why I am asking the above question is because I am also trying to get the
FFT (Power Spectral Estimate) x frequency graph of the vertical forces.

Thank you!
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Old   June 23, 2010, 00:14
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After asking some people, I got the answer to my question.
It might help others so I decided to post.

Since it is a two-phase flow, it is more apropriate to use "outflow".
"Pressure-outlet" is used mostly for gas.
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Old   July 9, 2010, 05:42
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hi ..did u completed 3d fludized bed simulation ..can u send case n data file to me plzzz.
if u dont have help me out plz..i have some doubts pertaining to udf and under relaxation factors ...
thx for telling it outflow . Its been very helpful for me
thx for replying in advance
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