[Other] Appropriate LES cyclic mesh

martyn88 · September 8, 2012, 04:37

Hi foamers,

I am conducting a LES simulation of a supersonic turbulent round jet and have some questions concerning my mesh.

My domain is a converging-diverging nozzle protruding into the free-stream. I have reduced my domain to a 1/8th pipe and am using cyclic boundary conditions on the two side faces. However I have created my grid by sweeping a structured 2-D mesh through a wedge, which means that now at the centre-line I have a sharp point with very high aspect ratio cells.
How do I best deal with the mesh at the centreline? I have subdivided the domain so that I have used tet prisms close to the centre axis and matched them with quad cells used for everywhere else. The mesh is shown below:

meshpic.jpg

Foam mesh.jpg

mesh shot.jpg

Am I restricted in the cells I choose because I am running LES? Is what I have done reasonable?

Any help would be really appreciated.

Thanks,

Hugh

martyn88 · September 10, 2012, 03:14

Could anyone help me with this?

Thanks in advance

September 8, 2012, 04:37	Appropriate LES cyclic mesh	#1
martyn88 Member Hugh Ingham Join Date: Aug 2012 Posts: 35 Rep Power: 14	Hi foamers, I am conducting a LES simulation of a supersonic turbulent round jet and have some questions concerning my mesh. My domain is a converging-diverging nozzle protruding into the free-stream. I have reduced my domain to a 1/8th pipe and am using cyclic boundary conditions on the two side faces. However I have created my grid by sweeping a structured 2-D mesh through a wedge, which means that now at the centre-line I have a sharp point with very high aspect ratio cells. How do I best deal with the mesh at the centreline? I have subdivided the domain so that I have used tet prisms close to the centre axis and matched them with quad cells used for everywhere else. The mesh is shown below: meshpic.jpg Foam mesh.jpg mesh shot.jpg Am I restricted in the cells I choose because I am running LES? Is what I have done reasonable? Any help would be really appreciated. Thanks, Hugh

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September 10, 2012, 03:14		#2
martyn88 Member Hugh Ingham Join Date: Aug 2012 Posts: 35 Rep Power: 14	Could anyone help me with this? Thanks in advance