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Abhijit Tilak August 23, 2001 11:31

on Boundary Condition for P' equation
 
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.

Frederic Felten August 23, 2001 12:10

Re: on Boundary Condition for P' equation
 
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.

Jim Park August 23, 2001 12:38

Re: on Boundary Condition for P' equation
 
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?


Jongtae Kim August 25, 2001 03:58

Re: on Boundary Condition for P' equation
 
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.



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