inlet velocity BC

ahsan · July 17, 2009, 00:53

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.

John · July 17, 2009, 13:38

how do you set the velocity BC if it is a 3d problem?

ahsan · July 20, 2009, 04:49

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.

ahsan · July 22, 2009, 05:17

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.

July 17, 2009, 00:53	inlet velocity BC	#1
ahsan New Member ahsan ikram Join Date: Jul 2009 Posts: 13 Rep Power: 17	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.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
velocity inlet vs pressure inlet	cheong	FLUENT	6	April 9, 2011 04:07
tangential velocity on a velocity inlet in 2D	bretti	FLUENT	0	July 3, 2007 09:42
Velocity Inlet	Hoshang Garda	FLUENT	1	April 19, 2007 02:36
Create hemisphere like velocity profile at inlet	Nelson	Main CFD Forum	3	July 27, 2005 13:05
what the result is negatif pressure at inlet	chong chee nan	FLUENT	0	December 29, 2001 06:13

July 17, 2009, 13:38		#2
John Member Join Date: Mar 2009 Posts: 49 Rep Power: 17	how do you set the velocity BC if it is a 3d problem?

July 20, 2009, 04:49		#3
ahsan New Member ahsan ikram Join Date: Jul 2009 Posts: 13 Rep Power: 17	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, 05:17		#4
ahsan New Member ahsan ikram Join Date: Jul 2009 Posts: 13 Rep Power: 17	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.