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3D pipe flow - Using UDF's to define fully developed turbulent flow on the inlet

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Old   February 19, 2016, 07:10
Default 3D pipe flow - Using UDF's to define fully developed turbulent flow on the inlet
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Taz Hussain
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Hi guys, really stuck so any help/guidance would be greatly appreciated.

I'm simulating turbulent flow within a 3D pipe and am looking to implement a UDF to create fully a turbulent flow profile at the inlet.

My inlet is parallel to the x axis/perpendicular to z and the symmetry condition in y throughout the whole pipe.

Ive found many 2D UDF guides but not any 3D turbulent flow UDF's.

I am also struggling to work out the parabolic equation. I also need my average velocity - do I just take the from FLUENT using the surface integrals?

If anyone can guide me on where to start or point to any existing codes, I would really appreciate it!

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Old   February 21, 2016, 11:12
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You can use Blasius's formula ( for "fully Developed Turbulent Flow In A Pipe For Moderate Reynolds Numbers".

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3d pipe in fleunt, fluent - udf, parabolic velocity, turbulent flow
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