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Old   August 23, 2001, 11:31
Default on Boundary Condition for P' equation
Abhijit Tilak
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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.


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Old   August 23, 2001, 12:10
Default Re: on Boundary Condition for P' equation
Frederic Felten
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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.


Frederic Felten.
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Old   August 23, 2001, 12:38
Default Re: on Boundary Condition for P' equation
Jim Park
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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?

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Old   August 25, 2001, 03:58
Default Re: on Boundary Condition for P' equation
Jongtae Kim
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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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