Hi friends,

I am solving Visc. Incomp flow. in a curved channel using SIMPLE. My outlet is sufficiently far from the bend region. I am specifying uniform pressure at exit (It's known) . I have no Idea what boundary condition to give on Pressure correction ie P'. Can anyone throw some light.

Thanks

Abhijit.

hi there,

i think that the simplest BC you can choose for the pressure is just: dP/dn = 0 where n is the normal direction to the boundary.

sincerely,

Frederic Felten.

I don't know SIMPLE in depth.

With that warning, can I guess that, if you know P at the outlet, the correction P' at the outlet should be zero?

Hi.

If you know pressure on exit boundary, you can use the pressure BC as you said.

Usually pressure is updates as p^(m+1) = p^(m) + p'

here m is iteration number.

If pressure is fixed, p'(pressure correction) is zero. That means Dirichlet BC is used at the boundary for pressure correction equation.