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Writing UDF for Robbins Bounday Condition

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Old   April 4, 2004, 23:13
Default Writing UDF for Robbins Bounday Condition
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To all Fluent CFD experts from all over the world,

I am encountering problem in writing Robbins BC with UDF. Actually i need to define the BC for porous downwall BC velocity dv/dy = v + constant... How can i write it with UDF file ?

I really appreciate youy kindly help.

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Old   April 6, 2004, 23:58
Default Re: Writing UDF for Robbins Bounday Condition
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1. You can explore the Porous model in Fluent. 2. Regarding the UDF you can use

C_DVDY(c,t) macro to access dv/dy

C_V(c,t) macro to access v

so the equation be written as

C_DVDY(c,t)= C_V(c,t) + contsant ;

be sure about the palce where you want to loop. Refer section 6.2 of UDF manual.

Best, Ady
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