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Two boundary layer meshes
Posted 19.06.2012, 10:20 GMT-4 Fluid & Heat, Computational Fluid Dynamics (CFD), Mesh Version 4.2a 1 Reply
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Hi! I am simulating the flow past a building. I wanted to have 2 boundary layer mesh settings. One is for the ground and the other one is for the building's walls. I did meshing as follows:
1. Add Free Tetrahedral to the whole domain and specify 'Size' for the Free Tetrahetral.
2. Add 'Distribution' to specify the number of grids on the walls of the building.
3. Add Boundary Layers, choose the ground, and specify the specifications.
If I did only these 3 steps, I get the boundary layer meshes on the ground. In addition, if I chose the ground and all walls of the buildings in step 3, I also get the boundary layer meshes on the ground and all the walls.
However, I examined the results and thought that I should try to use different specifications for the boundary layer meshs of the walls. So I add step 4 as follows
4. Left click on Mesh 1 node, select Boundary Layers.
5. On Boundary Layers 2, select all the walls and specify the specifications.
I found that the boundary layer meshes did not generated.
Do anyone know how to use 2 different boundary layer meshes?
Thank you.
Atit
1. Add Free Tetrahedral to the whole domain and specify 'Size' for the Free Tetrahetral.
2. Add 'Distribution' to specify the number of grids on the walls of the building.
3. Add Boundary Layers, choose the ground, and specify the specifications.
If I did only these 3 steps, I get the boundary layer meshes on the ground. In addition, if I chose the ground and all walls of the buildings in step 3, I also get the boundary layer meshes on the ground and all the walls.
However, I examined the results and thought that I should try to use different specifications for the boundary layer meshs of the walls. So I add step 4 as follows
4. Left click on Mesh 1 node, select Boundary Layers.
5. On Boundary Layers 2, select all the walls and specify the specifications.
I found that the boundary layer meshes did not generated.
Do anyone know how to use 2 different boundary layer meshes?
Thank you.
Atit
1 Reply Last Post 19.06.2012, 16:31 GMT-4
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Posted:
1 decade ago
Hi
its proably frpom the region where you boundary layers link in, if they are different they miht have problems to match at the borders between the 2 types. I mst admit I have never had to conider 2 types of boudary mesh elements, so far I have alwas managed with one type, but indded not all types of boundary shapes are accepted.
Boundary layers are not "thets" so at least in 4.2 there are some limtations on mapping operators across such layers
--
Good luck
Ivar
its proably frpom the region where you boundary layers link in, if they are different they miht have problems to match at the borders between the 2 types. I mst admit I have never had to conider 2 types of boudary mesh elements, so far I have alwas managed with one type, but indded not all types of boundary shapes are accepted.
Boundary layers are not "thets" so at least in 4.2 there are some limtations on mapping operators across such layers
--
Good luck
Ivar