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Modelling air flow in a pipe

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Old   March 31, 2011, 12:40
Default Modelling air flow in a pipe
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Chris Cavani
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I need to calculate the pressure drop of air through a 2m pipe. What would be the best boundary types to use? I would assume the inlet would be 'velocity-inlet' however this means that I am inputing a velocity in the 'boundary conditions' setup and I am also able to input a velocity at the 'initialize' settings. Should I leave one of these as 0? which one?

I am also unsure what is meant by 'flow rate weighting' when I set up the 'outflow' boundary condition.

Any help would be appreciated. Thanks.
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Old   March 31, 2011, 15:02
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velocity in the initialization settings is for the iteration, and can be set to 0.
"flow rate weighting" is used to allot flow rate when you have more than one outlet. if you have only one outlet, any value of "flow rate weighting" makes same result.
but i 'd like to say that if you just want to know the pressure drop, CFD will not always yield result better than conventional formula.
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