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

Taz-CFD · February 19, 2016, 08:10

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!

Regards,
Taz

engyMax · February 21, 2016, 12:12

Hi TAZ,

You can use Blasius's formula (http://nptel.ac.in/courses/112104118...ully_devel.htm) for "fully Developed Turbulent Flow In A Pipe For Moderate Reynolds Numbers".

Regards,
Er. Max

February 19, 2016, 08:10	3D pipe flow - Using UDF's to define fully developed turbulent flow on the inlet	#1
Taz-CFD New Member Taz Hussain Join Date: Feb 2016 Posts: 8 Rep Power: 10	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! Regards, Taz

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February 21, 2016, 12:12		#2
engyMax New Member Er. Max Join Date: Nov 2014 Posts: 6 Rep Power: 11	Hi TAZ, You can use Blasius's formula (http://nptel.ac.in/courses/112104118...ully_devel.htm) for "fully Developed Turbulent Flow In A Pipe For Moderate Reynolds Numbers". Regards, Er. Max