[GAMBIT] Meshing volume in between two meshed volumes

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 December 21, 2016, 05:08 Meshing volume in between two meshed volumes #1 New Member   Farhan Zainudin Join Date: Feb 2016 Posts: 5 Rep Power: 8 Hi, Suppose I have 3 identical volumes (to simplify, assume them as cubes 500 x 500 x 500) connected to each other in parallel (simply means 3 connected cubes in a straight line). I have already meshed the 1st and the 3rd volumes using Map scheme. But the mesh size is different. Let say the 1st volume has mesh size of 50, and the 3rd has mesh size of 100. So obviously the mesh count (or interval count in GAMBIT) will also be different for the two volumes. Now I want to mesh the 2nd volume (volume in the middle). My question is: Is there any way I can mesh this volume using Map scheme as well? Because 2 of its faces which are connected to the previous 2 volumes are already meshed with different mesh sizes. And we all know that in this case, we cannot simply use Map scheme for the middle volume. Appreciate anyone who can help/explain. Thank you.

 January 4, 2017, 09:49 volume mesh using gambit #2 New Member   George Corner Join Date: Dec 2016 Posts: 23 Rep Power: 7 Hi friends, I want to do volume mesh using GAMBIT but I couldn't. I did face mesh successfully but when I try to do volume mesh I faced with error. I try to do hex mesh using cooper but error told me one of faces has invalid mesh. I couldn't solve problem. please guide me. Regards

 January 4, 2017, 09:51 #3 New Member   Farhan Zainudin Join Date: Feb 2016 Posts: 5 Rep Power: 8 How does your geometry look like? Maybe I can help if you share the picture of your geometry.

January 4, 2017, 10:32
#4
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George Corner
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Quote:
 Originally Posted by AFarhanZ How does your geometry look like? Maybe I can help if you share the picture of your geometry.
Hi,

Thanks very much. I attached geometry. find please attachment.

Regards,
Attached Images
 2.JPG (156.3 KB, 29 views) 3.jpg (172.2 KB, 26 views)

January 4, 2017, 10:32
#5
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Maxime Perelli
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Quote:
 Originally Posted by AFarhanZ Hi, Suppose I have 3 identical volumes (to simplify, assume them as cubes 500 x 500 x 500) connected to each other in parallel (simply means 3 connected cubes in a straight line). I have already meshed the 1st and the 3rd volumes using Map scheme. But the mesh size is different. Let say the 1st volume has mesh size of 50, and the 3rd has mesh size of 100. So obviously the mesh count (or interval count in GAMBIT) will also be different for the two volumes. Now I want to mesh the 2nd volume (volume in the middle). My question is: Is there any way I can mesh this volume using Map scheme as well? Because 2 of its faces which are connected to the previous 2 volumes are already meshed with different mesh sizes. And we all know that in this case, we cannot simply use Map scheme for the middle volume. Appreciate anyone who can help/explain. Thank you.
you cannot mesh the cube in the volume since its opposite faces don t have same mesh.
You can disconnect your volumes and work with interfaces. The solver will then interpolate the results on the interfaces
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January 4, 2017, 10:36
#6
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Maxime Perelli
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Quote:
 Originally Posted by sam_cfdd Hi, Thanks very much. I attached geometry. find please attachment. Regards,
Mesh first ALL your surfaces. In your pictures, you are missing some mesh surfaces.
Once all your surfaces (front) are meshed, then you will mesh the volume easily (it is just an extrusion)
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In memory of my friend Hervé: CFD engineer & freerider

January 4, 2017, 10:45
#7
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George Corner
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Quote:
 Originally Posted by -mAx- Mesh first ALL your surfaces. In your pictures, you are missing some mesh surfaces. Once all your surfaces (front) are meshed, then you will mesh the volume easily (it is just an extrusion)
Actually I don't want to mesh that missing parts because these are hollow. I want fluid only flow from mesh areas. this is nozzle.

 January 4, 2017, 10:48 #8 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,293 Rep Power: 39 ah ok sorry. Are your sure all your volumes are connected? Blue lines are refering to non connected entities Try to connect all surfaces __________________ In memory of my friend Hervé: CFD engineer & freerider

January 4, 2017, 10:52
#9
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Farhan Zainudin
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Quote:
 Originally Posted by sam_cfdd Hi, Thanks very much. I attached geometry. find please attachment. Regards,
Yes, as Max suggested, you need to mesh all the front faces before you can Cooper through your volume. You can either mesh the opposite faces as well, or just mesh the front faces, before you Cooper.

January 4, 2017, 11:00
#10
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George Corner
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Quote:
 Originally Posted by -mAx- ah ok sorry. Are your sure all your volumes are connected? Blue lines are refering to non connected entities Try to connect all surfaces
means I have to connect front and back faces to each other?. can u please explain more.

January 4, 2017, 11:04
#11
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Farhan Zainudin
Join Date: Feb 2016
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Quote:
 Originally Posted by -mAx- you cannot mesh the cube in the volume since its opposite faces don t have same mesh. You can disconnect your volumes and work with interfaces. The solver will then interpolate the results on the interfaces
Thanks for the reply Max. Okay I will try it first and see the outcome.

 January 4, 2017, 11:05 #12 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,293 Rep Power: 39 for example in your picture the 2 bigs rectangle: if you extrude them, you will get 2 volumes. But you will extrude 2 times the common edges from the 2 bigs rectangle. That means between the 2 extruded volumes, you will have 2 superimposed surfaces which produces 2 disconnected volumes. For fixing it, go to surface/connect/all Check also if you create3d all the volumes, just enable shaded mode on for being sure __________________ In memory of my friend Hervé: CFD engineer & freerider

 January 4, 2017, 11:08 #13 New Member   Farhan Zainudin Join Date: Feb 2016 Posts: 5 Rep Power: 8 Based on my experience, error in using Copper could be because: 1. The source faces don't have the same interval count on the edges. 2. Face vertex type of the source faces are not identical.

 Tags gambit, volume meshing