Turbulent flow over a circular cylinder

ck3 · February 27, 2015, 15:03

Hi
I want to simulate a turbulent flow and heat transfer over a circular cylinder in 2D and 3D with ANSYS Gambit 2.4.6.
I need your help for meshing the domain and how to calculate the first cell height because I will use Yplus = 1 (Enhanced wall treatment).

ck3 · February 28, 2015, 11:11

Hi, from your experience what is the most reliable turbulence model for this kind of flow Re=3900). Please ant help it's urgent.

ck3 · February 28, 2015, 11:21

Hi, from your experience what is the most reliable turbulence model for this kind of flow (Re=3900). Please any help it's urgent.

I realized this meshing with Gambit 2.4.6 and the result of my first simulation with standard k-e model

What is your opinion?

-mAx- · March 3, 2015, 02:44

Do the same with standard k-epsilon (no enhanced wall treatment) and adapt your mesh for having first cell height with y+ around 30
And compare
http://www.cfd-online.com/Tools/yplus.php

This is a classic problem, and you should turn your solver on unsteady for getting "von karman" vortex oscillations

February 27, 2015, 15:03	Turbulent flow over a circular cylinder	#1
ck3 Member Khaled Join Date: Mar 2009 Posts: 53 Rep Power: 17	Hi I want to simulate a turbulent flow and heat transfer over a circular cylinder in 2D and 3D with ANSYS Gambit 2.4.6. I need your help for meshing the domain and how to calculate the first cell height because I will use Yplus = 1 (Enhanced wall treatment).

March 3, 2015, 02:44		#4
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	Do the same with standard k-epsilon (no enhanced wall treatment) and adapt your mesh for having first cell height with y+ around 30 And compare http://www.cfd-online.com/Tools/yplus.php This is a classic problem, and you should turn your solver on unsteady for getting "von karman" vortex oscillations __________________ In memory of my friend Hervé: CFD engineer & freerider

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February 28, 2015, 11:11		#2
ck3 Member Khaled Join Date: Mar 2009 Posts: 53 Rep Power: 17	Hi, from your experience what is the most reliable turbulence model for this kind of flow Re=3900). Please ant help it's urgent.