[ICEM] Structured Mesh on Complex Geometry

logitech · August 6, 2014, 22:44

Hey Guys,

I having trouble getting my mesh to converge in Fluent.

I have 1.6 Million nodes

Determinant > 0.4
Min angle > 9 degrees

Any suggestions I can make to the mesh?

Thanks

bluebase · August 8, 2014, 07:48

Hi Zak,

the min angle of 9 degree might be low, try to get closer to 45.

I also would improve the change rate of cell sizes. I marked the edges in your screenshots which might need some improvement. A small cell next to a relatively bigger cell can lead to numerical instabilities if high gradients are in this area (had this issue a while ago). I would try to make the change of cell sizes a bit smoother.

And another question, why is the mesh inside the canule aligned with the pipe's surface? Do you need the solid mesh?

meshcheck1.jpg meshcheck2.jpg

And what about the outlet, is it far enough downstream?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Volume mesh for Cyclone separator	Rajan	Pointwise & Gridgen	17	May 4, 2014 05:38
[ANSYS Meshing] Meshing Strategy for inside geometry	powpow	ANSYS Meshing & Geometry	6	January 16, 2013 04:32
[Gmsh] 2D Mesh Generation Tutorial for GMSH	aeroslacker	OpenFOAM Meshing & Mesh Conversion	12	January 19, 2012 03:52
2d irregular grid	Remy	Main CFD Forum	1	December 22, 2008 04:49
unstructured vs. structured grids	Frank Muldoon	Main CFD Forum	1	January 5, 1999 10:09

August 8, 2014, 07:48		#2
bluebase Senior Member Sebastian Engel Join Date: Jun 2011 Location: Germany Posts: 566 Rep Power: 20	Hi Zak, the min angle of 9 degree might be low, try to get closer to 45. I also would improve the change rate of cell sizes. I marked the edges in your screenshots which might need some improvement. A small cell next to a relatively bigger cell can lead to numerical instabilities if high gradients are in this area (had this issue a while ago). I would try to make the change of cell sizes a bit smoother. And another question, why is the mesh inside the canule aligned with the pipe's surface? Do you need the solid mesh? meshcheck1.jpg meshcheck2.jpg And what about the outlet, is it far enough downstream?