# inlet velocity BC

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 July 16, 2009, 23:53 inlet velocity BC #1 New Member   ahsan ikram Join Date: Jul 2009 Posts: 13 Rep Power: 15 hi i am modeling 2d fluidization for which i have to specify the inlet velocity . I know the volumetric flow rate of air and the cross-sectional area of the pipe at the inlet. plz guide me that for 2d problem how i calculate inlet velocity at inlet edge at which i have to specify inlet velocity BC.

 July 17, 2009, 12:38 #2 Member   Join Date: Mar 2009 Posts: 49 Rep Power: 16 how do you set the velocity BC if it is a 3d problem?

 July 20, 2009, 03:49 #3 New Member   ahsan ikram Join Date: Jul 2009 Posts: 13 Rep Power: 15 i will simply divide the known volumetric flow rate to the inlet area and will get inlet velocity at that face. but here, in 2D, problem is of defining inlet velocity at the edge.

 July 22, 2009, 04:17 #4 New Member   ahsan ikram Join Date: Jul 2009 Posts: 13 Rep Power: 15 hi john thanks for reply. actually, during work in 2D, when i specify inlet velocity boundary condition, i specify hydraulic diameter (which is used for tublence specification) which is double of acual dia of pipe. now problemis that how i define the cross-sectional area at inlet. will it be based upon hydraulic diameter or actual diameter.