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Meshing edges in Star CCM+ for CFD simulation.

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Old   June 4, 2022, 08:36
Cool Meshing edges in Star CCM+ for CFD simulation.
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Sai Teja
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I am doing a CFD study on a bluff body to study the drag variation. During the meshing process in Starccm+, I came across a stage where the mesh does end smoothly at the edge (see figures).

I have personally tried the following techniques:

1) Specifying the size at the feature curve but still I get the the weird shape at the edge.

2) meshing by created a seperate volume.


Which option could help me get over this?
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Old   June 10, 2022, 12:15
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Hi Sai,

Mesher is reducing the thickness of the prism layer because this layered surface is attached to a non-layered surface.
Wyh did not you mesh inside the body and why did you disable prism layer for back side of the body? If it is not a CHT case, you do not need to mesh solid regions. Substract the inner body and mesh the rest. Enable prism layer for all wall boundaries.
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Old   June 11, 2022, 15:26
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Quote:
I came across a stage where the mesh does end smoothly at the edge (see figures)
How should it be meshed in your opinion?
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Old   June 12, 2022, 09:08
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First of all, sorry that was a typo. I wanted to state that the mesh does not end smoothly.
I wanted to know like how do I mesh it such that there is a smoother transition from prism layers to the other bulk of the mesh?
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Old   June 12, 2022, 09:09
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other bulk of the mesh?
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Old   June 12, 2022, 09:13
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Quote:
Originally Posted by koful View Post
Hi Sai,

Mesher is reducing the thickness of the prism layer because this layered surface is attached to a non-layered surface.
Wyh did not you mesh inside the body and why did you disable prism layer for back side of the body? If it is not a CHT case, you do not need to mesh solid regions. Substract the inner body and mesh the rest. Enable prism layer for all wall boundaries.
actually, I do not need a prism layer behind the body since, I am meshing the wake of the bluff body seperately with specified size. My goal is to get a smoother transition from layered to un layered.
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Old   June 12, 2022, 12:55
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Once again: how should it be meshed in your opinion? - Just draw it in Paint or whatever.
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Old   June 13, 2022, 09:56
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Originally Posted by cwl View Post
Once again: how should it be meshed in your opinion? - Just draw it in Paint or whatever.
Basically here i need a smooth transition.
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Old   June 25, 2022, 04:57
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Seems like you haven't checked or tried the options that the prism layer mesher gives you.
I'd start there.
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Old   June 25, 2022, 10:49
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Originally Posted by Aeronautics El. K. View Post
Seems like you haven't checked or tried the options that the prism layer mesher gives you.
I'd start there.
Maybe instead of voicing bland comments if you could sugest me something that would be great.
I have explored the prism layer options in the Star CCM+ such as the minimum thickness percentage and layer reduction percentage. These were the main parameters affecting those edge layers. What else can I do more?
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Old   June 26, 2022, 05:43
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Quote:
Originally Posted by Sai1996 View Post
Maybe instead of voicing bland comments if you could sugest me something that would be great.
I have explored the prism layer options in the Star CCM+ such as the minimum thickness percentage and layer reduction percentage. These were the main parameters affecting those edge layers. What else can I do more?
You're right, seems like you're ahead of me.
I don't know the answer, sorry.

Cheers.
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Old   June 28, 2022, 02:13
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Mesh looks okay to me. Mesh you have shown is worst than what we already have. Still if you want more control, create surfaces along the body and apply different prism layer controls to them. Since you are connecting surface with prisms to surface without prism layers, it has to have transition somewhere. I would say don't go on the looks. By the looks of it, polyhedral is very ugly sometimes but works great.
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