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[GAMBIT] 3D Mesh for complex structure

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Old   November 16, 2012, 09:16
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Quote:
Originally Posted by -mAx- View Post
create one and use move tool to reach interested area...
Ok perfect!!
Now I must complete all model.
Anyway all this new volumes are connected, really?
So I mesh and no problem with solution in fluent?
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Old   November 16, 2012, 09:22
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yes they are connected.
To be sure, try to pick a volume and move it anywhere.
If you can move it, then it is not connected.
If you cannot, Gambit gives you the reason: connected to another entity...
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Old   November 16, 2012, 09:28
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Quote:
Originally Posted by -mAx- View Post
yes they are connected.
To be sure, try to pick a volume and move it anywhere.
If you can move it, then it is not connected.
If you cannot, Gambit gives you the reason: connected to another entity...
Very good trick!
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Old   November 16, 2012, 09:39
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Quote:
Originally Posted by -mAx- View Post
yes they are connected.
To be sure, try to pick a volume and move it anywhere.
If you can move it, then it is not connected.
If you cannot, Gambit gives you the reason: connected to another entity...
WAIT.
I rotate a volume:
no error message, GAMBIT rotate all model.
Also if I translate: GAMBIT translate all model.
Is it normal?
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Old   November 16, 2012, 09:46
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yes it is if you enable "connected geometry" --> it means, Gambit moves also all entities which are connected to the one you moved
Then the trick works if you disable the option
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Old   November 16, 2012, 10:20
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Ok all clear!
But I have a problem now.
When I mesh blue volume, GAMBIT consiglia me HEX/Wedge.
But I have this error:

ERROR: Projection intersection attempted without any free nodes on the
intersecting edge. Volume volume.25 could not be meshed.


When I mesh with TET/Hybrid:

Mesh of face face.778 contains 1 highly skewed elements (EQUISIZE SKEW > 0.97).

Mesh of face face.752 contains 1 highly skewed elements (EQUISIZE SKEW > 0.97).
ERROR: Meshing volume volume.25 aborted due to poor face mesh quality.
The user may proceed by first remeshing the faces with poor mesh quality,
or attempt to mesh the volume with the existing face meshes.
ERROR: Volume volume.25 could not be meshed without face(s) successfully meshed.
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Old   November 16, 2012, 13:10
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the blue volume has to be meshed with tetra.
If you want hexa, then you have to find a good decomposition.
The skewness is due a very small edge.
Here you can apply a size function for meshing finer in this area.
Or you modify your cad for preventing this issue
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Old   November 19, 2012, 01:36
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The very small edge issue can be fixed, by splitting the blue region with a surface formed by 4 vertices (small edges)
Sans titre1.png Sans titre2.png
Then you can mesh without errors and skewness problem
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Old   November 29, 2012, 18:34
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Hi max,
I send you a new part of model.
Problem is how connect all volumes.
I cannot connect external volume (half fuselage).
Have you some other trick?
thanks for your help!
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Old   November 30, 2012, 02:31
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did you try to merge alöl parts in your cad package?
in Gambit it will be tough
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Old   November 30, 2012, 02:45
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Quote:
Originally Posted by -mAx- View Post
did you try to merge alöl parts in your cad package?
in Gambit it will be tough
I don't know..
You say in the program that created it, or another application?
I have this model, when I import it, I have 87 ACIS BODY, 672 FACES, 23 EDGES, 0 VERTEX. So it does not recognize all volumes, only 87. I must connect faces with sticht command to create them.
But after I have problem with connections.
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Old   November 30, 2012, 02:58
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yes the program which creates the the model
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Old   November 30, 2012, 03:06
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Quote:
Originally Posted by -mAx- View Post
yes the program which creates the the model
then I cannot do anything in GAMBIT?
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Old   November 30, 2012, 03:24
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Another question:
it may be due to poor tolerance of model saved in CAD package?
When I import it, I have distance tolerance of 0.001: it is too low?
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Old   November 30, 2012, 06:06
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I don't know...
which cad pakage are you using?
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Old   December 3, 2012, 07:03
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Quote:
Originally Posted by -mAx- View Post
I don't know...
which cad pakage are you using?
My cad pakage is Catia.
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Old   December 4, 2012, 02:02
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I don't knw this package, but check if you have the possbility to merge all volumes (parts) into one (like a fusion)
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Old   December 4, 2012, 04:07
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I don't knw this package, but check if you have the possbility to merge all volumes (parts) into one (like a fusion)
ok I'll try, but this operation it will not be quick because I don't have to hand the source at the time.
Anyway can you advise me importing options?
Just to see if there are errors or trips to use.
Attached Images
File Type: jpg importing.jpg (33.6 KB, 3 views)
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Old   December 4, 2012, 04:13
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i am handling with step files...
Else you can delete all you volumes (without otion lower geometry), and reconstruct the whole volume.
But you need to split and connect many surface.
It will ask you lots of work...
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Old   December 4, 2012, 04:29
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Quote:
Originally Posted by -mAx- View Post
i am handling with step files...
Else you can delete all you volumes (without otion lower geometry), and reconstruct the whole volume.
But you need to split and connect many surface.
It will ask you lots of work...
It is the same thing if I import model without make tolerant so I have only faces?
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