[ICEM] Error while computing prism mesh:: ALLCRASH, prism.exe

nikesh · August 26, 2015, 22:42

I'm not sure if anybody has encountered this problem but I keep getting this. Probably memory not sufficient? I tried reducing the grid points a lot and yet the problem persists.
Has anyone dealt with this before? Please check the picture attached below.
I generated tetra mesh for my aircraft model and this error pops up while towards the end of creating Prism mesh for my model.
The 2nd pic is what I get after I close the Error message, "Close the Program".

Any help highly appreciated!!
Thanks in advance.
Nikesh

Far · August 27, 2015, 02:52

how many layers of prism you are trying to create?

nikesh · August 27, 2015, 03:41

I had started with 5. And later with 3. Got the same error!

Far · August 27, 2015, 03:45

show some geometry pics + surface mesh pics

nikesh · August 27, 2015, 04:43

This is what Ive created. I get those error when I compute Prism Mesh on this.

Far · August 27, 2015, 05:10

some where icem cfd is creating negative volume. I dont know where.

Did you check the quality of surface mesh? Moreover every part which is going to share the prism mesh, must have similar parameters. for example same no of layers...

nikesh · August 27, 2015, 05:57

A quick check of mesh gives me this~Fig5 below. It doesn't say anything about negative volume though.
While I'm at it, I have one question to ask. In Figs 4 & 6, I have circled in Red, curves where the software automatically generates more nodes than that I had assigned.
I can't seem to figure out why and how to fix it.

Far · August 27, 2015, 06:07

Ok. So you are using bottom-up approach!

patch dependent or patch independent? In any case, you must turn on the respect line elements.

If you are going from top-down (octree) approach and want to just re mesh single surface with low quality mesh, use same approach as described earlier. Also update the volume mesh after this step in Edit Mesh Menu....

nikesh · August 28, 2015, 00:51

Yaa bottom-up approach, and with patch independent option.
I want to give the no of grid points on the curves of the aircraft and build up the mesh accordingly but somehow in my case the mesh I've created is not obeying my command. Somewhere my approach did not work.
Any heads up for me??

Far · August 28, 2015, 13:21

there are many methods to do it.

But first you must use respect line elements command...

nikesh · August 30, 2015, 21:27

Yes I did that, still not working. Here's how I've done:
Fig1: Model and Computational Domain
Fig2: Global Mesh Parameters Setup
Fig3: Part Mesh Setup
Fig4: Shell Meshing Parameters, Patch independent (I tried patch dependent approach too, it didn't help), Respect Line elements is checked and the rest of the values are default values.
Fig5: Curve Mesh Setup. Here I assigned grid points to each and all the curves. And then copy parameters, etc. etc.
Fig6: Computing Surface Mesh only.
Fig7 & Fig8: Resulting Surface Mesh. The program automatically generates more grid points than I had assigned to the curves. Fig1.jpg

Fig2.JPG

Fig3.jpg

Fig4.jpg

Fig5.jpg

nikesh · August 30, 2015, 21:28

The remaining Figures.

Fig6.JPG

Fig7.jpg

Fig8.jpg

Any heads up here is highly appreciated!
Thanks a lot.
Nikesh.

Far · August 30, 2015, 23:53

i can notice you have very less no of nodes on surface of airfoil. increase them first. secondly attach your tin files, so i can suggest your more solution options.

nikesh · August 31, 2015, 20:01

I tried increasing my number of grid points but it still generates denser mesh than my computer can handle. I'm completely puzzled and baffled!!!
Would really appreciate it if you took a look into it and suggested me some approaches to generating a good mesh for my case.
Thanks.
Nikesh

Link here:
https://drive.google.com/file/d/0B42...ew?usp=sharing

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August 27, 2015, 02:52		#2
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	how many layers of prism you are trying to create?

August 27, 2015, 03:41		#3
nikesh Member Nikesh Bhattarai Join Date: Nov 2011 Location: Sacheon, South Korea Posts: 82 Rep Power: 13	I had started with 5. And later with 3. Got the same error!

August 27, 2015, 03:45		#4
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	show some geometry pics + surface mesh pics

August 27, 2015, 05:10		#6
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	some where icem cfd is creating negative volume. I dont know where. Did you check the quality of surface mesh? Moreover every part which is going to share the prism mesh, must have similar parameters. for example same no of layers...

August 27, 2015, 06:07		#8
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	Ok. So you are using bottom-up approach! patch dependent or patch independent? In any case, you must turn on the respect line elements. If you are going from top-down (octree) approach and want to just re mesh single surface with low quality mesh, use same approach as described earlier. Also update the volume mesh after this step in Edit Mesh Menu....

August 28, 2015, 00:51		#9
nikesh Member Nikesh Bhattarai Join Date: Nov 2011 Location: Sacheon, South Korea Posts: 82 Rep Power: 13	Yaa bottom-up approach, and with patch independent option. I want to give the no of grid points on the curves of the aircraft and build up the mesh accordingly but somehow in my case the mesh I've created is not obeying my command. Somewhere my approach did not work. Any heads up for me??

August 28, 2015, 13:21		#10
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	there are many methods to do it. But first you must use respect line elements command...

August 30, 2015, 21:27		#11
nikesh Member Nikesh Bhattarai Join Date: Nov 2011 Location: Sacheon, South Korea Posts: 82 Rep Power: 13	Yes I did that, still not working. Here's how I've done: Fig1: Model and Computational Domain Fig2: Global Mesh Parameters Setup Fig3: Part Mesh Setup Fig4: Shell Meshing Parameters, Patch independent (I tried patch dependent approach too, it didn't help), Respect Line elements is checked and the rest of the values are default values. Fig5: Curve Mesh Setup. Here I assigned grid points to each and all the curves. And then copy parameters, etc. etc. Fig6: Computing Surface Mesh only. Fig7 & Fig8: Resulting Surface Mesh. The program automatically generates more grid points than I had assigned to the curves. Fig1.jpg Fig2.JPG Fig3.jpg Fig4.jpg Fig5.jpg

August 30, 2015, 21:28		#12
nikesh Member Nikesh Bhattarai Join Date: Nov 2011 Location: Sacheon, South Korea Posts: 82 Rep Power: 13	The remaining Figures. Fig6.JPG Fig7.jpg Fig8.jpg Any heads up here is highly appreciated! Thanks a lot. Nikesh.

August 30, 2015, 23:53		#13
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	i can notice you have very less no of nodes on surface of airfoil. increase them first. secondly attach your tin files, so i can suggest your more solution options.

August 31, 2015, 20:01		#14
nikesh Member Nikesh Bhattarai Join Date: Nov 2011 Location: Sacheon, South Korea Posts: 82 Rep Power: 13	I tried increasing my number of grid points but it still generates denser mesh than my computer can handle. I'm completely puzzled and baffled!!! Would really appreciate it if you took a look into it and suggested me some approaches to generating a good mesh for my case. Thanks. Nikesh Link here: https://drive.google.com/file/d/0B42...ew?usp=sharing