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how derivative at boundary set to zero?

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Old   May 30, 2004, 14:20
Default how derivative at boundary set to zero?
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mehdi_a
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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.
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Old   May 30, 2004, 14:50
Default Re: how derivative at boundary set to zero?
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mehdi_a
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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.
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Old   June 1, 2004, 11:01
Default Re: how derivative at boundary set to zero?
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ozgur
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Hi,

Choose the symmetry boundary condition, or wall boundary with zero shear stress.
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Old   June 1, 2004, 22:30
Default Re: how derivative at boundary set to zero?
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Arun
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You could use outflow or pressure outlet boundary condition. They are first order extrapolating boundary conditions.
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