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Old   May 30, 2004, 06:53
Default Boundary condition to UDS
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hi, Iam giving outflow boundary condition for all flow variables at the exit. For User defined scalars at the exit, I want to give normal gradient is zero( which is different from the two options given in for UDS). For that i want to write a UDF. Can u tell me which Define macro can be used for this, if we can write UDF for defining BC for UDS. Please help me in this.

Thanks a lot
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Old   May 30, 2004, 14:11
Default Re: Boundary condition to UDS
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Hi ramesh vedula. I have a same problem.I want to set the derivative of velocity to zero at boundary.If you find this please help me. thanks.
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Old   September 20, 2015, 12:56
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I would appreciate if anyone can help me.
I wanted to return derivative of UDS as wall boundary value, but I face with "fatal signal" that I found this because of boundary condition UDS.
this is part of my udf for B.C of UDS( volume fraction of nanoparticle in my case)

Thread *t;
cell_t c;


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Old   June 22, 2017, 06:13
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I have to remain anonymous, I'm sorry.
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Did you ever manage to figure this out? I have a similar issue...
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