[ICEM] Associating two edges to one curve problem

Tom.Elson · October 16, 2011, 15:29

Hi,

I'm creating a fully structured 3d mesh of a propeller blade passage.

The propeller geometry from hub to tip is defined by one curve at the leading edge and two curves at the trailing edge.

When I create an O-Grid around the blade (creating four edges) , I associate one edge to each trailing edge curve, but then have to associate two edges to the single leading edge curve. I THINK this is causing problems on the blade mesh as there seems to be an overlap in the mesh.

Has anyone got any ideas how to resolve this issue?

I was thinking of maybe trying to creat another replica curve, but this may change the geometry and hence the entire problem being modelled.

Any input would be greatly appreciated.

Many thanks

Tom

Sai Swaroop · October 17, 2011, 02:21

Hi,

Firstly I must remind I am also a newbie to both software and structured mesh.

When you assign two edges to the same curve and move the vertices, the block and/or the edge in between doesnt vanish but gets compressed and hence you either get overlap mesh/mesh with bad quality/triangulation.

Try deleting the block between the two edges permanently, assign one set of edge and vertices to the curve and merge the other to the prior. This might solve the problem.

This is what I did for similar kind of problem. Anyways there could be better solutions which I also would like to know.

Tom.Elson · October 24, 2011, 12:45

Thanks for the reply Sai.

It was a good idea!

However, in the end I assigned the edges to the surface of the blade. It seems to do the trick but means have to do a lot more work as need to have lots of blocks along the blade to define the surface!

Thanks

Tom

BrolY · October 25, 2011, 09:50

Maybe you coudl try quarter of O-grid !
But it's hard to help without any pictures.

October 16, 2011, 15:29	Associating two edges to one curve problem	#1
Tom.Elson New Member Tom Elson Join Date: Feb 2011 Posts: 10 Rep Power: 15	Hi, I'm creating a fully structured 3d mesh of a propeller blade passage. The propeller geometry from hub to tip is defined by one curve at the leading edge and two curves at the trailing edge. When I create an O-Grid around the blade (creating four edges) , I associate one edge to each trailing edge curve, but then have to associate two edges to the single leading edge curve. I THINK this is causing problems on the blade mesh as there seems to be an overlap in the mesh. Has anyone got any ideas how to resolve this issue? I was thinking of maybe trying to creat another replica curve, but this may change the geometry and hence the entire problem being modelled. Any input would be greatly appreciated. Many thanks Tom

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Gambit - meshing over airfoil wrapping (?) problem	JFDC	FLUENT	1	July 11, 2011 05:59
[GAMBIT] Split edges?	Zweeper	ANSYS Meshing & Geometry	14	February 25, 2010 14:28
problem with lift curve in airfoil	thanos	FLUENT	4	February 14, 2010 07:26
[snappyHexMesh] external flow with snappyHexMesh	chelvistero	OpenFOAM Meshing & Mesh Conversion	11	January 15, 2010 19:43
Edges invisible, vertices still there	Carlos	CFX	0	July 19, 2005 09:45

October 17, 2011, 02:21		#2
Sai Swaroop New Member Sai Swaroop Join Date: Oct 2011 Location: Bangalore, India Posts: 11 Rep Power: 14	Hi, Firstly I must remind I am also a newbie to both software and structured mesh. When you assign two edges to the same curve and move the vertices, the block and/or the edge in between doesnt vanish but gets compressed and hence you either get overlap mesh/mesh with bad quality/triangulation. Try deleting the block between the two edges permanently, assign one set of edge and vertices to the curve and merge the other to the prior. This might solve the problem. This is what I did for similar kind of problem. Anyways there could be better solutions which I also would like to know.

October 24, 2011, 12:45		#3
Tom.Elson New Member Tom Elson Join Date: Feb 2011 Posts: 10 Rep Power: 15	Thanks for the reply Sai. It was a good idea! However, in the end I assigned the edges to the surface of the blade. It seems to do the trick but means have to do a lot more work as need to have lots of blocks along the blade to define the surface! Thanks Tom

October 25, 2011, 09:50		#4
BrolY Senior Member AB Join Date: Sep 2009 Location: France Posts: 323 Rep Power: 21	Maybe you coudl try quarter of O-grid ! But it's hard to help without any pictures.