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Implementation of pressure-inlet for FVM

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Old   May 20, 2006, 23:22
Default Implementation of pressure-inlet for FVM
  #1
Yang
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hi,

I develop a program using Finite Volume Method(FVM). I need implement the pressure-inlet boundary conditions. Who knows,or has the source code about pressure-inlet for FVM? Looking forward to your replies.Thanks! Yang

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Old   May 21, 2006, 16:25
Default Re: Implementation of pressure-inlet for FVM
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ramp
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Hi !!

first derivative of pressure normal to the boundary equals to zero.

(\partial p)/ (\partial n)=0

for all boundaries except the outflow. At the outflow specify p=0.

With these conditions, you will get the pseudo-pressure. This will, however, not affect the correctness of the velocity field. The actual pressure boundary conditions are complicated, so it is best to use the pseudo-pressure field to compute the velocity field and then solve the pressure Poisson equation to get the actual pressure if, and when, necessary.

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Old   May 30, 2006, 23:10
Default Re: Implementation of pressure-inlet for FVM
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zhang
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The inlet velocity is usually assumed as time constant. So, the pressure boundary condition on the inlet can be derived from the NSE as, for incompressible flows: gradient_pressure=-rho*g+rho*vieo*Laplacian_velocity

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