[ICEM] problem export 2d geometry

Marcuse · January 14, 2015, 08:28

Hi there,

I'm a new member of this community, although I'm used to looking for help in this forum (thanks a lot for your work).
I'm writing about a problem concerning the simulation around a 2d airfoil (yes, the same of the tutorial on youtube). Of course I've read all the threads about it but I think I have a different problem, so I decided to open a new thread (I hope it's fine).
After all the procedure (associate all the edges to curves, etc.), when the mesh is finally ready, I try to launch it in Fluent (in Workbench) but it show me the message "Build Grid: aborted due a critical error". I think the problem is in the Fluent launcher because the dimensions are set to 3d instead of 2d.
I have to say that a week ago I did some simulations and even using the same script of those ones Fluent doesn't want to work.
Any suggestions will be very appreciated. (I'm freaking out)

I attached the Dropbox with geometry and the script until boundary conditions (because i'm quite sure that it's right until this point).

https://www.dropbox.com/s/k1sq38kqsl...oblem.zip?dl=0

bluebase · January 14, 2015, 18:40

Hi Marcuse,

when you are using the Workbench, check the settings of the simulation objects.
First check your fluent object. Highlight "setup" and see if the option the option "show launcher at startup" is checked. then double click on "setup" in the fluent object. in the launcher there is an option to select either 2d or 3d. Chose the correct one.

If you have used an geometry object (I haven't downloaded your files) then check the options for this object. there should be an option to select the analysis type, either 2d or 3d.

Let me know if this doesn't help.

with regards,
Sebastian

Marcuse · January 15, 2015, 06:19

Hi bluebase,

first of all, thank you for your reply.

The option "show launcher at startup" was already checked. If I don't link ICEM with FLUENT in workbench space, I can choose between 2d or 3d. As I link the model of icem with fluent, in the launcher window the option is automaticaly set to 3d. I tried to set first "2d" in the launcher window and then link icem with fluent, but I received the error : "imported Case/Mesh file has wrong dimension [3d]. You need to restart Fluent", and then the option is set to 3d again.

I haven't used a geometry object, I imported a file with points in icem and then I linked them one by one.

best regards,

Marco

bluebase · January 19, 2015, 14:26

Ok, it seems fluent and workbench are not the source of the error.
Maybe it's a simple problem.
In ICEM, when you export the mesh to fluent, a form opens where you select the save location and scaling. At the same dialog you can select the dimensions of the exported mesh, either 2d or 3d. Even if you only have 2d-elements in your mesh the 2d-option is necessary to get the mesh right for fluent.

Marcuse · January 19, 2015, 17:02

Thank you again for your help, i'm really freaking out with this problem. The dialog windows appears when ICEM writes the import file for fluent, I always chose 2d. What I noticed these days (after several attempts) is that if I launch fluent stand alone, but in the same workbench file, setting 2d and importing the file of the mesh (saved in the ICM folder) it works the first time, but if I launch another "stand-alone" fluent with the same mesh, it says that the mesh is in 3d again.
Is it possible that the problem concerns the name of the files?
just to be sure that I use the workbench well, as I write the input for fluent in ICEM, I r-click on model to export data to new component fluent, because when I do so, it doesn't work.

I'm quite sure that is a simple problem, but it's very frustrating...

p.s if you need I could attach a workbench folder with all the files

bluebase · January 20, 2015, 09:21

Hmm, i can't think of a solution... but i'm not very experienced using the workbench ... Usually i just use the stand alone versions. Running ICEM with a script file always troublesome when i tried to use the workbench.
As far as I know all the mesh and geometry conversion and transmission should all be handled by the workbench itself...i think trying to open the mesh directly from the ICEM folder is not a good way. By using that method the workbench might not get the information which is the correct mesh or conversion method.
I could have a look on the case files if you like. You can send me a pm.

With regards,
Sebastian

Marcuse · January 20, 2015, 12:23

Thank you, I sent you a pm!

bluebase · January 26, 2015, 15:34

Here is a possible solution.
Apparently, there are difficulties present when using ICEM in Workbench to create a 2D mesh.
The Analysis type (3D or 2D) can't be preset for ICEM unlike the standard mesher and fluent. To let Workbench know the right analysis type, one can use the "update project" button in an open ICEM window (the yellow lightning) before closing the window. But didn't seem to be permanent and have be redone every time ICEM is reopened. If somebody knows a better way, feel free to tell us.

With regards,
Sebastian

January 14, 2015, 08:28	problem export 2d geometry	#1
Marcuse New Member Join Date: Dec 2014 Posts: 5 Rep Power: 11	Hi there, I'm a new member of this community, although I'm used to looking for help in this forum (thanks a lot for your work). I'm writing about a problem concerning the simulation around a 2d airfoil (yes, the same of the tutorial on youtube). Of course I've read all the threads about it but I think I have a different problem, so I decided to open a new thread (I hope it's fine). After all the procedure (associate all the edges to curves, etc.), when the mesh is finally ready, I try to launch it in Fluent (in Workbench) but it show me the message "Build Grid: aborted due a critical error". I think the problem is in the Fluent launcher because the dimensions are set to 3d instead of 2d. I have to say that a week ago I did some simulations and even using the same script of those ones Fluent doesn't want to work. Any suggestions will be very appreciated. (I'm freaking out) I attached the Dropbox with geometry and the script until boundary conditions (because i'm quite sure that it's right until this point). https://www.dropbox.com/s/k1sq38kqsl...oblem.zip?dl=0

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January 14, 2015, 18:40		#2
bluebase Senior Member Sebastian Engel Join Date: Jun 2011 Location: Germany Posts: 567 Rep Power: 21	Hi Marcuse, when you are using the Workbench, check the settings of the simulation objects. First check your fluent object. Highlight "setup" and see if the option the option "show launcher at startup" is checked. then double click on "setup" in the fluent object. in the launcher there is an option to select either 2d or 3d. Chose the correct one. If you have used an geometry object (I haven't downloaded your files) then check the options for this object. there should be an option to select the analysis type, either 2d or 3d. Let me know if this doesn't help. with regards, Sebastian

January 15, 2015, 06:19		#3
Marcuse New Member Join Date: Dec 2014 Posts: 5 Rep Power: 11	Hi bluebase, first of all, thank you for your reply. The option "show launcher at startup" was already checked. If I don't link ICEM with FLUENT in workbench space, I can choose between 2d or 3d. As I link the model of icem with fluent, in the launcher window the option is automaticaly set to 3d. I tried to set first "2d" in the launcher window and then link icem with fluent, but I received the error : "imported Case/Mesh file has wrong dimension [3d]. You need to restart Fluent", and then the option is set to 3d again. I haven't used a geometry object, I imported a file with points in icem and then I linked them one by one. best regards, Marco

January 19, 2015, 14:26		#4
bluebase Senior Member Sebastian Engel Join Date: Jun 2011 Location: Germany Posts: 567 Rep Power: 21	Ok, it seems fluent and workbench are not the source of the error. Maybe it's a simple problem. In ICEM, when you export the mesh to fluent, a form opens where you select the save location and scaling. At the same dialog you can select the dimensions of the exported mesh, either 2d or 3d. Even if you only have 2d-elements in your mesh the 2d-option is necessary to get the mesh right for fluent.

January 19, 2015, 17:02		#5
Marcuse New Member Join Date: Dec 2014 Posts: 5 Rep Power: 11	Thank you again for your help, i'm really freaking out with this problem. The dialog windows appears when ICEM writes the import file for fluent, I always chose 2d. What I noticed these days (after several attempts) is that if I launch fluent stand alone, but in the same workbench file, setting 2d and importing the file of the mesh (saved in the ICM folder) it works the first time, but if I launch another "stand-alone" fluent with the same mesh, it says that the mesh is in 3d again. Is it possible that the problem concerns the name of the files? just to be sure that I use the workbench well, as I write the input for fluent in ICEM, I r-click on model to export data to new component fluent, because when I do so, it doesn't work. I'm quite sure that is a simple problem, but it's very frustrating... p.s if you need I could attach a workbench folder with all the files

January 20, 2015, 09:21		#6
bluebase Senior Member Sebastian Engel Join Date: Jun 2011 Location: Germany Posts: 567 Rep Power: 21	Hmm, i can't think of a solution... but i'm not very experienced using the workbench ... Usually i just use the stand alone versions. Running ICEM with a script file always troublesome when i tried to use the workbench. As far as I know all the mesh and geometry conversion and transmission should all be handled by the workbench itself...i think trying to open the mesh directly from the ICEM folder is not a good way. By using that method the workbench might not get the information which is the correct mesh or conversion method. I could have a look on the case files if you like. You can send me a pm. With regards, Sebastian

January 20, 2015, 12:23		#7
Marcuse New Member Join Date: Dec 2014 Posts: 5 Rep Power: 11	Thank you, I sent you a pm!

January 26, 2015, 15:34		#8
bluebase Senior Member Sebastian Engel Join Date: Jun 2011 Location: Germany Posts: 567 Rep Power: 21	Here is a possible solution. Apparently, there are difficulties present when using ICEM in Workbench to create a 2D mesh. The Analysis type (3D or 2D) can't be preset for ICEM unlike the standard mesher and fluent. To let Workbench know the right analysis type, one can use the "update project" button in an open ICEM window (the yellow lightning) before closing the window. But didn't seem to be permanent and have be redone every time ICEM is reopened. If somebody knows a better way, feel free to tell us. With regards, Sebastian