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Old   October 26, 2005, 01:10
Default can you help me
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Md. Tajul Islam
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I am working with rarefied gas microflow in micro channel. Here . To use N-S equation in this area I need to use slip boundary condition. I use Fluent 6.1. I can not create its UDF code. On the tutorial, I haven't found a complete explanation about this kind of UDF. If any one code this slip condition for fluent I will be grateful to him. Tajul

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Old   October 26, 2005, 05:51
Default Re: can you help me
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Alec Eiffel
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Fluent has a Maxwell slip boundary condition for low pressure gas systems in version 6.2 but i think its in 6.1 as well. Details in section 14.2.2 of the user manual.

The only other way I know off to specify a slip condition in Fluent is to give a constant shear value in the wall boundary conditions.
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Old   October 26, 2005, 06:19
Default Re: can you help me
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Md. Tajul Islam
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Hi Thank you for your response. I want to use the wall slip condition

u=constant*(delu/deln), where u is the wall velocity and n is the normal coordinate pointing inward from the channel wall. Tajul
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