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-   -   how derivative at boundary set to zero? (http://www.cfd-online.com/Forums/fluent/33844-how-derivative-boundary-set-zero.html)

mehdi_a May 30, 2004 14:20

how derivative at boundary set to zero?
 
Hi everyone. I want to set the derivative of velocity to zero at boundary.for example du/dx=0(derivative of y velocity to zero )at exit. please help me. thanks.

mehdi_a May 30, 2004 14:50

Re: how derivative at boundary set to zero?
 
Hi everyone. I want to set the derivative of velocity to zero at boundary.for example du/dx=0(derivative of y velocity to zero )at exit. please help me. thanks.

ozgur June 1, 2004 11:01

Re: how derivative at boundary set to zero?
 
Hi,

Choose the symmetry boundary condition, or wall boundary with zero shear stress.

Arun June 1, 2004 22:30

Re: how derivative at boundary set to zero?
 
You could use outflow or pressure outlet boundary condition. They are first order extrapolating boundary conditions.


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