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-   -   [ICEM] meshing a long pipe (http://www.cfd-online.com/Forums/ansys-meshing/72250-meshing-long-pipe.html)

 feizaghaee January 30, 2010 03:27

meshing a long pipe

hi i'm going to mesh a long pipe. it's 180 meter with 1.5 meter diameter. this pipe has 90 degree curve after 30 m from inlet whit curve radius of 15 meter. i want to generate a prism mesh with triangular base that every cell has 1 meter length along the pipe. how can i do that.
kind regards.

 feizaghaee January 30, 2010 08:50

nobody knows?

 kakhtar January 30, 2010 13:32

Did you follow tuturial No1 of ICEM

 feizaghaee January 30, 2010 15:29

That tutorial is 2D. My project is 3D and in that tutorial mesh is tetrahedral. That means its pyramid but I want to generate perism mesh.

 gajemon February 2, 2010 05:28

post a picture of your long pipe

 PSYMN February 3, 2010 11:58

options...

Are you looking for a swept mesh or a tetra prism mesh?

If it is tetra/prism, I think that a 1 meter long cell with a 1.5 meter diameter pipe is too coarse. You won't get enough curvature capture (assuming the prism is equilateral).

I would suggest a sweep method.

Mesh the end of the pipe (quad dominant, but with inflation (2D-BLayer)) and then use the option to extrude the mesh along the curve of the pipe. You will be able to have a decent cross section mesh, but have high aspect ratio elements so you can easily achieve your 1 meter length elements, but with good fit in your 1.5 meter diameter pipe.

ICEM CFD Hexa would also be a very good choice for this geometry. you could block it quickly and use an OGrid to very precisely control the boundary layer.

 feizaghaee February 4, 2010 15:54

i have use Hexa mesh and blocking but i think if i use tetra mesh i would obtain better result. i want to use a mesh in shape of triangular that extruded normaly.

 PSYMN February 5, 2010 01:23

Since your pipe bends, a simple normal sweep won't work, but you could run a curve along the center of the pipe (or perhaps a seam along the side or inner surface of the bend would work...)

Then Extrude the mesh along the curve.

Simon

 longbow February 5, 2010 10:15

Quote:
 Originally Posted by feizaghaee (Post 244981) i have use Hexa mesh and blocking but i think if i use tetra mesh i would obtain better result. i want to use a mesh in shape of triangular that extruded normaly.
Why do you think tetra mesh is better in your situation? On the contrary, Hexa mesh is well-known to produce better results with less number of nodes/elements in wall-bounded flow.

 feizaghaee February 6, 2010 06:43

thanks a lot

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