# Accuracy in Boundary Layer solution in Fluent

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 August 28, 2013, 03:26 Accuracy in Boundary Layer solution in Fluent #1 New Member   rameshkumar m bhoraniya Join Date: Dec 2009 Posts: 21 Rep Power: 7 I am trying so solve Axisymmetric boundary layer flow over a cylinder of small radius. the model in 2-D flow is just a rectangular domain with L*R size. the Boundary conditions applied are as under.... Inlet: Uniform velocity U=1 m/s,V=0 No slip bc: at cylinder wall U=0,V=0 Outlet BC: pressure is zero Free stream bc: U= 1,V=0 The cylinder radius is 10 mm and the normal direction height is about 10 times that of cylinder radius. model size is 1 meter * 100 mm. the computational domain is having enough length in normal to flow direction for free stream boundary condition. I am getting solution but outside the boundary layer to free stream the velocity increses from 1.00 to 1.008 and again approaches to 1.00 ,which is not perfect from boundary layer solution point of view. which is expected to exactly 1.00 m/s. i.e in any circumstance U should not more than 1.00 m/s. Thanks in advance for in suggestion to correct it.

 August 28, 2013, 06:27 #2 Senior Member     Alex Join Date: Jun 2012 Location: Germany Posts: 1,097 Rep Power: 19 Why dont you post a picture? That would really help in understanding the problem you are facing. rameshbhoraniya likes this.

September 7, 2013, 00:53
Boundary Layer Flow
#3
New Member

rameshkumar m bhoraniya
Join Date: Dec 2009
Posts: 21
Rep Power: 7
Dear please see the attached file , for velocity profile at trailing end.
Attached Files
 uvel1.xls (75.0 KB, 10 views)

September 7, 2013, 02:26
#4
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duri
Join Date: May 2010
Posts: 130
Rep Power: 7
Quote:
 Originally Posted by rameshbhoraniya I am getting solution but outside the boundary layer to free stream the velocity increses from 1.00 to 1.008 and again approaches to 1.00 ,which is not perfect from boundary layer solution point of view. which is expected to exactly 1.00 m/s. i.e in any circumstance U should not more than 1.00 m/s.
This is perfect. Local mass defect in boundary layer will produce this local acceleration and it will appear in all NS solvers.

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