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How to set the gradient of scalar when using UDS

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Old   September 2, 2013, 09:39
Default How to set the gradient of scalar when using UDS
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Y Zhao
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Hi everyone, I met a problem about adding UDS in Fluent. I would like to see the scalar transportation in a chamber. If I want to set the gradient of scalar at the outlet to be zero which means the scalar there has no change, how can I set it? The inlet and outlet boundary conditions are separately velocity inlet and pressure outlet. Thank you.

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Yuchun
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Old   September 5, 2013, 02:02
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Hi dude
Just go to the interest B.C, then click on UDS tab and finally select flux (gradient) scalar option from the left side and set zero value for the corresponding parameter. It's easy and straightforward.
Good luck
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Old   September 5, 2013, 03:31
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Quote:
Originally Posted by A CFD free user View Post
Hi dude
Just go to the interest B.C, then click on UDS tab and finally select flux (gradient) scalar option from the left side and set zero value for the corresponding parameter. It's easy and straightforward.
Good luck
Thanks a lot!
I still have a question: in the user's guide, it says "If you select Specified Flux, your input will be the value of the flux at the boundary". Here, is the flux the same as the gradient?
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Old   September 5, 2013, 18:01
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Hi
Definitely yup. It is actually Neumann boundary condition.
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