# Boundary conditions in Fluent

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 January 7, 2003, 15:21 Boundary conditions in Fluent #1 Ankan Kumar Guest   Posts: n/a Hi I am new to Fluent. Can anybody tell me how do I put a FULLY DEVELOPED inlet boundary condition for pipe flow in Fluent? The velocity inlet conditon gives me plug flow which is not what I want. Thanks Ankan

 January 7, 2003, 22:50 Re: Boundary conditions in Fluent #2 Keil Guest   Posts: n/a Hi, All we can do such a thing is that we have to customize the boundary condition via User Defined Function(called UDF) . Or, how about extend the inlet to be fully developed flow?. I mean , we make the inlet region(called entrance region, or inlet length , enctrance length) This length is given by Boussineq or Nikuradse in laminar flow . Latzko in turbulence. When we make this length ,Fully developed flow is got automatically. This way is the most easy way I guess. Regards,

 January 10, 2003, 21:08 Re: Boundary conditions in Fluent #3 Alamgir Guest   Posts: n/a For your help further just look UDF manul 1st-3rd chapters and you have a clear idea about your problem. cheers Alamgir

March 20, 2016, 12:13
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 Originally Posted by Alamgir ;104033 For your help further just look UDF manul 1st-3rd chapters and you have a clear idea about your problem. cheers Alamgir

Dear expert.. I have to use Superficial gas velocity 0.0016 m/s. But In fluent we have to put Velocity Magnitude at VELOCITY INLET boundary conditions.( INLET VELOCITY) How can I calculate INLET GAS VELOCITY form superficial gas velocity??? ( Reactor dimensions are 20*5*50 cm W*D*L and inlet dimensions are 2.4*1.2 L*D )

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