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Old   November 7, 2012, 12:04
Default Bug in DM
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Sijal Ahmed Memon (turboenginner@gmail.com)
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I am working on some youtube tutorials where I want to make the Hexa meshing in ICEM on the gambit meshing tutorial (know as sedan tutorial). I wanted to make the some repairing work in DM on sedan , but I am surprised to see that DM is making more issues, whereas Gambit is perfect. I have also tried in ICEM with no errors.

Any one knows what is the problem with DM?

Gambit:



Design Modeller:



ICEM:
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Old   November 7, 2012, 12:06
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can you share file ??
let's investigate this together...
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Old   November 7, 2012, 12:09
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Here you go

https://dl.dropbox.com/u/68746918/sedan.igs

See this thread and post #12 (same case in ICEM : tetra + prism)
http://www.cfd-online.com/Forums/ans...d-pl-help.html
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Old   November 7, 2012, 13:56
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did you try other format, personnaly don't like iges....
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Old   November 7, 2012, 14:01
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OK, may be i have a clue.
The default import option in designmodeler includes "stitch surface" as yes
Switching it to no resolves the problem.


that is may be due to designmodeler trying to stitch a complex set of surfaces...
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Old   November 7, 2012, 14:22
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that is the problem. you are good at DM
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Old   November 7, 2012, 14:24
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are you able to repair the dirty geometry in DM? Or we should use the spaceclaim?
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Old   November 7, 2012, 14:27
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i always use DM, i never used spaceclaim...
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Old   November 7, 2012, 14:28
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I mean, can you repair the missing surfaces, sliver faces, short edge and other problems in sedan cad model (I just shared on forum) in DM.

I see more problems as compared to gambit and ICEM in DM
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Old   November 7, 2012, 14:30
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not sure but let's do this...
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Old   November 7, 2012, 15:41
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ok, this is what i've done so far:
i removed some very bad surfaces that were merged to the ones next to them



i recreated them using edges:


I did a "sew" with a very small tolerance (10e-6 if project was imported in meter)





Did the same for the back, noticed that surface is not really what i want, but i think that can i be solved if i used a split and did it in two step instead of one:


Last surfce is created so i can perform a fill... of course sew has to be done in each steps



there may be a easier way of doing this... hope i can discover it in the future when dealing with other geometries
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Old   November 7, 2012, 16:32
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i did the split i mentioned for the back, created three surfaces seperatly then sew:



Geometry is repaired:

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Old   November 7, 2012, 16:51
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Two questions come into mind:

1. Why in first palce DM had the errors, when gambit and ICEM didn't

2. After repairing are you sure that they are original surfaces?
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Old   November 7, 2012, 16:57
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i don't know how gambit works... because your iges contains surfaces, and since icem cfd is a surface based mesher, it didn't find any difficulty dealing with. DM includes solid and surface, you gave it a hard time maybe ?!
After repairing , the original surfaces are merged and sewed into a new one.
sorry for not being clear here it's first and only things it came to my mind
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Old   November 7, 2012, 16:59
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Gambit is solid direct modeller and works on solid as DM. And that IGES was a solid model and ICEM converted it into surfaces by default.

If that model was not solid then DM would have the surfaces only.
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Old   November 7, 2012, 17:01
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sorry, my knowledge is limited
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Old   November 7, 2012, 17:15
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that being said, how about the step file ??
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Old   November 7, 2012, 17:19
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Quote:
Originally Posted by diamondx View Post
that being said, how about the step file ??
Gambit only provided the IGES file , but may be I can export that file in step format form gambit and then we try in DM? What do you say?
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Old   November 7, 2012, 17:23
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export step from icem and it will work on DM...
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