[GAMBIT] Dimensionless height of boundary layer thickness

aja1345 · May 28, 2015, 07:11

Hi,
I designed a model of turbine. Now, I want to mesh this model.
Therefore, I should have a sufficient number of layers in boundary layer. But I dont know that what number consider. For this reason, I have to know value of Dimensionless height of boundary layer thickness until I can calculate value of thickness of boundary layer.
And also, I have to know value of growth factor for meshing.
I am grateful that guide me about these values and if it is possible, please place useful links about these subjects.
On the other hand, I want to use from K-e turbulence model with wall function.
Thanks,
Best,
Amir

-mAx- · May 28, 2015, 07:48

you can estimate BL thickness over a flat plate
http://en.wikipedia.org/wiki/Boundary-layer_thickness
you don't need to give exact values for you case, it is just a way to capture the BL with a fine and nice mesh. around your body.
Once you get converged solution you will see if your mesh around your body is good or not

May 28, 2015, 07:11	Dimensionless height of boundary layer thickness	#1
aja1345 Senior Member Aja Join Date: Nov 2013 Posts: 496 Rep Power: 14	Hi, I designed a model of turbine. Now, I want to mesh this model. Therefore, I should have a sufficient number of layers in boundary layer. But I dont know that what number consider. For this reason, I have to know value of Dimensionless height of boundary layer thickness until I can calculate value of thickness of boundary layer. And also, I have to know value of growth factor for meshing. I am grateful that guide me about these values and if it is possible, please place useful links about these subjects. On the other hand, I want to use from K-e turbulence model with wall function. Thanks, Best, Amir

May 28, 2015, 07:48		#2
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	you can estimate BL thickness over a flat plate http://en.wikipedia.org/wiki/Boundary-layer_thickness you don't need to give exact values for you case, it is just a way to capture the BL with a fine and nice mesh. around your body. Once you get converged solution you will see if your mesh around your body is good or not aja1345 likes this. __________________ In memory of my friend Hervé: CFD engineer & freerider

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