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Accuracy in Boundary Layer solution in Fluent

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Old   August 28, 2013, 03:26
Default Accuracy in Boundary Layer solution in Fluent
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rameshkumar m bhoraniya
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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.
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Old   August 28, 2013, 06:27
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Why dont you post a picture? That would really help in understanding the problem you are facing.
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Old   September 7, 2013, 00:53
Default Boundary Layer Flow
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Dear please see the attached file , for velocity profile at trailing end.
Attached Files
File Type: xls uvel1.xls (75.0 KB, 10 views)
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Old   September 7, 2013, 02:26
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Quote:
Originally Posted by rameshbhoraniya View Post
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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