[ICEM] IGES/STEP Import - Line 'gap' / Merge points.

Wingman · September 1, 2016, 13:00

Hello,

I have a wing profile and far-field sketch in AutoDesk Inventor. I have exported it as both IGES and STEP files. When importing to ICEM CFD the sketched lines are imported as curves like planned...

...BUT, the curves doesn't seem to be connected to each other. 'Linked' curves have different end points and acts like there is a gap.

I've been trying to have the points merged but I can't seem to find the trick. Any ideas?

Here is the STEP file if someone wants to take a look.

niablis · September 1, 2016, 19:56

I have repeatedly struggled with this problem, too. Try importing the file as a parasolid (.x_t). Also, you can use Designmodeler in Ansys Workbench to import the geometry and then directly export it to ICEM as an .agdb file. These seem to help, sometimes. I feel like ICEM just has a really hard time with geometry tolerances. I have tried loading the same file into Star-CCM+ and ICEM. ICEM's had a lot of disconnected curves and surfaces while Star-CCM's did not. If you do find some helpful answers, please share them!

niablis · September 1, 2016, 20:45

Ok after loading your file into ICEM, I don't quite understand where you are having problems. You can use "Concatenate/Re-approximate Curves" to link your curves together. I could see no visible discontinuity between the curves and/or their points, but you will have to zoom very close to some of the curves to see all of them, esp. on the outlet of your FF.

BTW, make sure to run through some of the 2-D tutorials, read the stickied post on the main ICEM thread, and here are some other training docs. Oh and the little question mark help button? its a great resource! Hope it helps!!

Wingman · September 12, 2016, 05:58

I couldn't figure this out. I never seemed to be able to create a surface from those curves. I ended up by drawing inside the geometry inside ICEM.

Thanks for letting me know of the "Concatenate/Re-approximate Curves".

niablis · September 12, 2016, 13:27

Hey, no problem! Glad I could help in some way. I have received a lot of help from this forum and I like to give back. Cheers!

September 1, 2016, 13:00	IGES/STEP Import - Line 'gap' / Merge points.	#1
Wingman Member William Join Date: Aug 2016 Posts: 56 Rep Power: 10	Hello, I have a wing profile and far-field sketch in AutoDesk Inventor. I have exported it as both IGES and STEP files. When importing to ICEM CFD the sketched lines are imported as curves like planned... ...BUT, the curves doesn't seem to be connected to each other. 'Linked' curves have different end points and acts like there is a gap. I've been trying to have the points merged but I can't seem to find the trick. Any ideas? Here is the STEP file if someone wants to take a look.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
8x icoFoam speed up with Cufflink CUDA solver library	kmooney	OpenFOAM Running, Solving & CFD	42	November 6, 2012 12:37
[blockMesh] BlockMesh FOAM warning	gaottino	OpenFOAM Meshing & Mesh Conversion	7	July 19, 2010 15:11
[blockMesh] BlockMeshmergePatchPairs	hjasak	OpenFOAM Meshing & Mesh Conversion	11	August 15, 2008 08:36
[blockMesh] BlockMeshmergePatchPairs polyTopoChanger	benru	OpenFOAM Meshing & Mesh Conversion	3	June 29, 2008 22:24
Errors running allwmake in OpenFOAM141dev with WM_COMPILE_OPTION%3ddebug	unoder	OpenFOAM Installation	11	January 30, 2008 21:30

September 1, 2016, 19:56		#2
niablis Member B.H. Join Date: Nov 2014 Location: PA, USA Posts: 47 Rep Power: 12	I have repeatedly struggled with this problem, too. Try importing the file as a parasolid (.x_t). Also, you can use Designmodeler in Ansys Workbench to import the geometry and then directly export it to ICEM as an .agdb file. These seem to help, sometimes. I feel like ICEM just has a really hard time with geometry tolerances. I have tried loading the same file into Star-CCM+ and ICEM. ICEM's had a lot of disconnected curves and surfaces while Star-CCM's did not. If you do find some helpful answers, please share them!

September 1, 2016, 20:45		#3
niablis Member B.H. Join Date: Nov 2014 Location: PA, USA Posts: 47 Rep Power: 12	Ok after loading your file into ICEM, I don't quite understand where you are having problems. You can use "Concatenate/Re-approximate Curves" to link your curves together. I could see no visible discontinuity between the curves and/or their points, but you will have to zoom very close to some of the curves to see all of them, esp. on the outlet of your FF. BTW, make sure to run through some of the 2-D tutorials, read the stickied post on the main ICEM thread, and here are some other training docs. Oh and the little question mark help button? its a great resource! Hope it helps!!

September 12, 2016, 05:58		#4
Wingman Member William Join Date: Aug 2016 Posts: 56 Rep Power: 10	I couldn't figure this out. I never seemed to be able to create a surface from those curves. I ended up by drawing inside the geometry inside ICEM. Thanks for letting me know of the "Concatenate/Re-approximate Curves".

September 12, 2016, 13:27		#5
niablis Member B.H. Join Date: Nov 2014 Location: PA, USA Posts: 47 Rep Power: 12	Hey, no problem! Glad I could help in some way. I have received a lot of help from this forum and I like to give back. Cheers!