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.

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.

Re: how derivative at boundary set to zero?
Hi,
Choose the symmetry boundary condition, or wall boundary with zero shear stress. 
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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