# [ICEM] meshing a long pipe

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 January 30, 2010, 03:27 meshing a long pipe #1 Senior Member     moein Join Date: Dec 2009 Posts: 132 Rep Power: 7 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. look forward to your answer. kind regards.

 January 30, 2010, 08:50 #2 Senior Member     moein Join Date: Dec 2009 Posts: 132 Rep Power: 7 nobody knows?

 January 30, 2010, 13:32 #3 New Member   Join Date: Dec 2009 Posts: 6 Rep Power: 7 Did you follow tuturial No1 of ICEM

 January 30, 2010, 15:29 #4 Senior Member     moein Join Date: Dec 2009 Posts: 132 Rep Power: 7 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.

 February 2, 2010, 05:28 #5 New Member   Join Date: Oct 2009 Posts: 20 Rep Power: 7 post a picture of your long pipe

 February 3, 2010, 11:58 options... #6 Senior Member     Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,662 Blog Entries: 1 Rep Power: 36 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.

 February 4, 2010, 15:54 #7 Senior Member     moein Join Date: Dec 2009 Posts: 132 Rep Power: 7 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.

 February 5, 2010, 01:23 #8 Senior Member     Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,662 Blog Entries: 1 Rep Power: 36 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

February 5, 2010, 10:15
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Quote:
 Originally Posted by feizaghaee 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.

 February 6, 2010, 06:43 #10 Senior Member     moein Join Date: Dec 2009 Posts: 132 Rep Power: 7 thanks a lot

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