[ICEM] Meshing sinusoidal leading edge wing in ICEM

ryerson_guy · April 8, 2013, 04:45

Last pic is attached

ryerson_guy · April 8, 2013, 04:46

Showpony I have tried that method before but didn't work out for me.

ShowponyStuart · April 8, 2013, 05:10

Quote:

Originally Posted by ryerson_guy

Showpony I have tried that method before but didn't work out for me.

What problems did you have with it last time? I might have had the same issues. I spent ages getting it to work properly (though it was my first time using ICEM lol)
I started of doing it the same way you did but found it too tedious and not worth it as I could get the same (or better) results doing it without splitting the block in the spanwise direction.

I will have another look in a moment, but I have a feeling that FAR will be much more help to you than I will be. But I will Try

ShowponyStuart · April 8, 2013, 05:29

One thing I have notices is that you do not have many elements in the spanwise direction. You are barely going to capture the geometry with 8 elements across let alone get any decent resolution of your flow. It will up your element count A LOT but really is probably necessary. If you want to reduce node count you might have to consider a hybrid mesh.

I know in my simulations there is definite 3D flow effects, so if you want to capture them you are definitely going to have to increase the element count in the spanwise direction.

I increased the node count to 12 across each block in the spanwise direction and then projected to edges as mention earlier and I had no problems with volume errors.

https://www.dropbox.com/s/00ft3ejsjz...%20%282%29.zip

Also, if you separate the walls you called symmetry into symmetry1 and symmetry2, you can turn of one of the walls and get a much clearer idea of what is happening with the mesh (because you dont get all that extra interference).

Make sure you renumber the nodes and reduce the bandwidth too if you are struggling to deal with teh extra amount of nodes. Should help a bit.

ryerson_guy · April 8, 2013, 15:11

Sorry the files that I uploaded and the one the pics have a mismatch. The pic has 40 elements along the span, where as the files have less. I still get the same error whenever I try to improve.

ryerson_guy · April 8, 2013, 23:44

Does the way your geometry was drawn and imported to ICEM matters? The initial one and the ones i uploaded were drawn and imported a different way.

ShowponyStuart · April 9, 2013, 02:38

Not sure what you are talking about man. Did you even look at either of the files I sent you? 40 elements across is not enough. I ended up doing 12 element on each of the blocks. ie. 12x8=96nodes on the spanwise direction.

I got that rar file you uploaded working fine by doing what I said. the "tubercle_0.5cwave"

The "tubercle_0.2cwave" hasnt been blocked or anything so Im not sure what was going on there.

All I did was increase the amount of spanwise nodes significantly and change the premesh from "project to face" to "project to edge". Literally all I did. Ran the check and there were no errors.

ryerson_guy · April 9, 2013, 05:56

So you just increased the elements in my files as well as projecting edges thats it?

ryerson_guy · April 9, 2013, 06:15

You didnt change my blocking method?

ShowponyStuart · April 9, 2013, 06:16

Didnt change blocking, just increased the elements in my files as well as projecting edges and it seemed to work nicely for me.

ryerson_guy · April 9, 2013, 06:20

Would you mind uploading the file please? I am doing the same thing as you and yet having errors again

ShowponyStuart · April 9, 2013, 06:20

That said, I still wouldnt bother splitting your blocks like that. It is pretty much a waste of time. can get the same results without splitting it in the spanwise direction

ShowponyStuart · April 9, 2013, 06:21

I already did it earlier

but here it is again

https://www.dropbox.com/s/00ft3ejsjz...%20%282%29.zip

EDIT: You mean the same thing with the increasing spanwise nodes and projecting to edge?

ryerson_guy · April 9, 2013, 06:24

Yes increasing spanwise nodes and projecting edges. The link to the file doesnt work.

ShowponyStuart · April 9, 2013, 07:04

See if that works now

https://www.dropbox.com/s/00ft3ejsjz...%20%282%29.zip

Far · April 9, 2013, 11:55

problem in geometry

ryerson_guy · April 9, 2013, 11:55

Thanks for the upload, but i still see some negative determinants elements although they are very small. Are you using Fluent to run your cases?

ryerson_guy · April 9, 2013, 15:11

Far is there a way I can look for geometry errors in ICEM?

ShowponyStuart · April 10, 2013, 00:07

I was running the check in ICEM. I found that if I have no problems in icem then I will have no problems in CFX.

Far · April 10, 2013, 02:57

Why it is not projecting to geometry?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
ICEM Hexa meshing tutorial - Wing with sharp trailing edge	Far	ANSYS	1	May 18, 2012 14:19
[ANSYS Meshing] Hybrid meshing ICEM	djoul	ANSYS Meshing & Geometry	2	January 17, 2012 18:18
[snappyHexMesh] Meshing 3D wing (hydrofoil) fails	klausb	OpenFOAM Meshing & Mesh Conversion	0	December 28, 2011 14:26
Meshing for 3D wing with tubercle on the leading edge in GAMBIT	nvtrieu	FLUENT	0	August 14, 2010 10:13
Poor Residuals at Intersection Between Symmetry Plane and Airfoil Leading Edge	TWaung	CFX	2	February 16, 2010 08:11

April 8, 2013, 04:46		#22
ryerson_guy New Member Join Date: Jan 2013 Posts: 18 Rep Power: 13	Showpony I have tried that method before but didn't work out for me.

April 8, 2013, 05:29		#24
ShowponyStuart Member Stuart Join Date: Jun 2012 Posts: 59 Rep Power: 13	One thing I have notices is that you do not have many elements in the spanwise direction. You are barely going to capture the geometry with 8 elements across let alone get any decent resolution of your flow. It will up your element count A LOT but really is probably necessary. If you want to reduce node count you might have to consider a hybrid mesh. I know in my simulations there is definite 3D flow effects, so if you want to capture them you are definitely going to have to increase the element count in the spanwise direction. I increased the node count to 12 across each block in the spanwise direction and then projected to edges as mention earlier and I had no problems with volume errors. https://www.dropbox.com/s/00ft3ejsjz...%20%282%29.zip Also, if you separate the walls you called symmetry into symmetry1 and symmetry2, you can turn of one of the walls and get a much clearer idea of what is happening with the mesh (because you dont get all that extra interference). Make sure you renumber the nodes and reduce the bandwidth too if you are struggling to deal with teh extra amount of nodes. Should help a bit.

April 8, 2013, 15:11		#25
ryerson_guy New Member Join Date: Jan 2013 Posts: 18 Rep Power: 13	Sorry the files that I uploaded and the one the pics have a mismatch. The pic has 40 elements along the span, where as the files have less. I still get the same error whenever I try to improve.

April 8, 2013, 23:44		#26
ryerson_guy New Member Join Date: Jan 2013 Posts: 18 Rep Power: 13	Does the way your geometry was drawn and imported to ICEM matters? The initial one and the ones i uploaded were drawn and imported a different way.

April 9, 2013, 02:38		#27
ShowponyStuart Member Stuart Join Date: Jun 2012 Posts: 59 Rep Power: 13	Not sure what you are talking about man. Did you even look at either of the files I sent you? 40 elements across is not enough. I ended up doing 12 element on each of the blocks. ie. 12x8=96nodes on the spanwise direction. I got that rar file you uploaded working fine by doing what I said. the "tubercle_0.5cwave" The "tubercle_0.2cwave" hasnt been blocked or anything so Im not sure what was going on there. All I did was increase the amount of spanwise nodes significantly and change the premesh from "project to face" to "project to edge". Literally all I did. Ran the check and there were no errors.

April 9, 2013, 05:56		#28
ryerson_guy New Member Join Date: Jan 2013 Posts: 18 Rep Power: 13	So you just increased the elements in my files as well as projecting edges thats it?

April 9, 2013, 06:15		#29
ryerson_guy New Member Join Date: Jan 2013 Posts: 18 Rep Power: 13	You didnt change my blocking method?

April 9, 2013, 06:16		#30
ShowponyStuart Member Stuart Join Date: Jun 2012 Posts: 59 Rep Power: 13	Didnt change blocking, just increased the elements in my files as well as projecting edges and it seemed to work nicely for me.

April 9, 2013, 06:20		#31
ryerson_guy New Member Join Date: Jan 2013 Posts: 18 Rep Power: 13	Would you mind uploading the file please? I am doing the same thing as you and yet having errors again

April 9, 2013, 06:21		#33
ShowponyStuart Member Stuart Join Date: Jun 2012 Posts: 59 Rep Power: 13	I already did it earlier but here it is again https://www.dropbox.com/s/00ft3ejsjz...%20%282%29.zip EDIT: You mean the same thing with the increasing spanwise nodes and projecting to edge?

April 9, 2013, 11:55		#36
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	problem in geometry

April 10, 2013, 02:57		#40
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	Why it is not projecting to geometry?

April 9, 2013, 06:24		#34
ryerson_guy New Member Join Date: Jan 2013 Posts: 18 Rep Power: 13	Yes increasing spanwise nodes and projecting edges. The link to the file doesnt work.

April 9, 2013, 07:04		#35
ShowponyStuart Member Stuart Join Date: Jun 2012 Posts: 59 Rep Power: 13	See if that works now https://www.dropbox.com/s/00ft3ejsjz...%20%282%29.zip

April 9, 2013, 15:11		#38
ryerson_guy New Member Join Date: Jan 2013 Posts: 18 Rep Power: 13	Far is there a way I can look for geometry errors in ICEM?

April 10, 2013, 00:07		#39
ShowponyStuart Member Stuart Join Date: Jun 2012 Posts: 59 Rep Power: 13	I was running the check in ICEM. I found that if I have no problems in icem then I will have no problems in CFX.