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UDS boundary for pressure-out

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Old   May 23, 2018, 11:00
Default UDS boundary for pressure-out
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Lee
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Hi~every one,
I found a problems in my work and want to discuss with you. I calculated a uds in my case so I need to set the boundary condition for my outlet. Tne quesition is how I set the boundary condition? Here are two ways to set the boundary condition:specified flux and specified value...I am confused about it. Is the value of UDS at the outlet I am going to calculate? Why I need set it?
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Old   May 23, 2018, 21:58
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Alexander
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yes, that is the value of your UDS (if you use fixed value option)
to calculate UDS you must define source and boundary condition, to get the distribution field in domain.

Let suppose, you have source and only flux = 0 everywhere, in that case you UDS may get any value

I hope this will help you

best regards
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Old   May 24, 2018, 07:56
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Lee
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thanks AlexanderZ, I konw what you means. But I want to ask a question like this: If there is one inlet and one outlet in my geometry.Fluid material is liquid. The UDS transport equation includes transient term(by default), source term (user defined ) , Convective term(flux function is mass flow rate) and diffusion term (I defined the diffusion coefficient). I set the fix value of the UDS at the inlet.All the other boundary condition is standard wall and UDS bondary condition is fix value of 0. I mean this condition I need set the bondary condition for the UDS at the outlet? Isn't it computering by the transport equation?
best wishes
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