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Tips to set Mass Flow-Rate boundary condition for multiple-face boundary

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william:
When using a mass-flow-inlet boundary condition, if more than one region is contained within the same
boundary condition zone, the value of the Mass Flow Rate that should be defined is the sum of the individual
mass flow rates, as showed on images attached.
Using this strategy, the resulted inlet velocity will be proportional to face areas.
This can be useful if you have several inlets, once you need to set only one named selection for all inlet
regions and one boundary condition definition.

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