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Boundary condition updating in OpenFOAM

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Old   January 28, 2014, 17:27
Default Boundary condition updating in OpenFOAM
Zifei Yin
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I have noticed that in each time step, boundary condition is updated severals times, such as, three times for Ux Uy Uz, and one time for pressure equation, other times for turbulence equation.

Here is my concern, Is it possible to reduce those repeated updating times? In my customized boundary condition code, it won't change within the same time step, which makes a huge CPU time waste to run boundary condition code for so many times within the same time step.

Thanks for helping
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Old   February 4, 2014, 03:58
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Are you talking about updating them to match the fixedGradient/zeroGradient condition when the values of the cells change?

These can't be avoided, but if you have a fixedValue (or time dependent), it should not have to be used, because the values of the boundary are independent of the inner cells.
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