Understanding variableHeightFlowRateInletVelocity boundary condition -- CFD Online Discussion Forums

April 22, 2015, 12:54	Understanding variableHeightFlowRateInletVelocity boundary condition	#1
escodonic New Member Jorge Escobar Join Date: Apr 2015 Posts: 1 Rep Power: 0	I am doing a two phase flow simulation with VOF. As an inlet BC I'm using the "variableHeightFlowRateInletVelocity". As inputs OpenFoam requires the volumetric flow rate and the phase-fraction field. When running some cases I can see that the water free surface elevation can change in time. I assume that if the height increases, the velocity should decrease, and always the volumetric flow rate is constant. Somebody knows how that BC works? How OpenFoam makes the change of velocity and height in time? Thanks

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