meshing of multi-materials geometry
- phsieh2005
- Topic Author
- Visitor
-
18 years 9 months ago #595
by phsieh2005
meshing of multi-materials geometry was created by phsieh2005
Hi,
I am working on a heat transfer project. Basically, I have an enclosure. Inside the enclosure, there are several mechanical components - all different materials.
The CAD model was saved to STEP format. When I imported into Salome, I only got one volume (all merged together), so, it is impossible to assign different material properties to each volume. Is anyone here has this type of experiment?
Also, the air partition is in contact with surfaces of the mechanical components, how to ensure that at the air/solid interfaec, the mesh is consistent?
Thanks!
phsieh2005
I am working on a heat transfer project. Basically, I have an enclosure. Inside the enclosure, there are several mechanical components - all different materials.
The CAD model was saved to STEP format. When I imported into Salome, I only got one volume (all merged together), so, it is impossible to assign different material properties to each volume. Is anyone here has this type of experiment?
Also, the air partition is in contact with surfaces of the mechanical components, how to ensure that at the air/solid interfaec, the mesh is consistent?
Thanks!
phsieh2005
- Joël Cugnoni
-
- Offline
- Moderator
-
18 years 9 months ago #596
by Joël Cugnoni
Joël Cugnoni - a.k.a admin
www.caelinux.com
Replied by Joël Cugnoni on topic Re:meshing of multi-materials geometry
First question: why do you need to mesh the air volume? Is it for heat transfer? Could you use a simple convection formula instead of a full \"multiphysics\" simulation?
Finally, what you need to do is to use the partition & explode tools in Salome/GEOM to create all the volume you need for the simulation.
To create a mesh that is consistent between 2 volumes, the only way is to merge all the volumes and the partition the global volume. For example, to mesh a wing in an \"air\" box, you should start with the air box and partition it with the wing geometry (you must have an intersection between the wing and air box boundaries to make this thing work, so you might need to partition your air boxe in two to four parts before you start). Using the partition tool will allow a simple creation of volumes that will share a common surface, which means that will have a consistent mesh on the shared surface.
Look at the geometry tutorial to see how the partition / explode tools work.
Finally, what you need to do is to use the partition & explode tools in Salome/GEOM to create all the volume you need for the simulation.
To create a mesh that is consistent between 2 volumes, the only way is to merge all the volumes and the partition the global volume. For example, to mesh a wing in an \"air\" box, you should start with the air box and partition it with the wing geometry (you must have an intersection between the wing and air box boundaries to make this thing work, so you might need to partition your air boxe in two to four parts before you start). Using the partition tool will allow a simple creation of volumes that will share a common surface, which means that will have a consistent mesh on the shared surface.
Look at the geometry tutorial to see how the partition / explode tools work.
Joël Cugnoni - a.k.a admin
www.caelinux.com
- phsieh2005
- Topic Author
- Visitor
-
18 years 9 months ago #602
by phsieh2005
Replied by phsieh2005 on topic Re:meshing of multi-materials geometry
Thanks a lot!
This is a conjugate heat transfer problem. Convection coef depends on the coupling between fluid flow and conduction on the solid surface. So, I need to include air parition to model air flow. I would like to use elmer to solve this problem.
I am hoping to import the complex geometry from SolidWorks (saved as STEP format). Maybe I can import each part one by one and then do the partition. I will give the parition a try.
Best Regards,
phsieh2005
This is a conjugate heat transfer problem. Convection coef depends on the coupling between fluid flow and conduction on the solid surface. So, I need to include air parition to model air flow. I would like to use elmer to solve this problem.
I am hoping to import the complex geometry from SolidWorks (saved as STEP format). Maybe I can import each part one by one and then do the partition. I will give the parition a try.
Best Regards,
phsieh2005
- phsieh2005
- Topic Author
- Visitor
-
18 years 9 months ago #647
by phsieh2005
Replied by phsieh2005 on topic Re:meshing of multi-materials geometry
Dear Admin:
Thanks for the answer. I merged all the parts, did partitions. Now, I am able to mesh all the partitions with the common faces connected.
The problem I have now is that, each partition has different material properties. If I export the mesh, will it export as \"one\" mesh? Then, how do I assign different material to each partition? Does the exported mesh still has the partition information?
I will be using elmer to solve this conjugate heat transfer problem. I am still using your LiveDVD beta 2, so, I do not think that I can export the mesh to unv format. I will give this a try when your next version is out (with Salome v3.2.1).
phsieh2005
Thanks for the answer. I merged all the parts, did partitions. Now, I am able to mesh all the partitions with the common faces connected.
The problem I have now is that, each partition has different material properties. If I export the mesh, will it export as \"one\" mesh? Then, how do I assign different material to each partition? Does the exported mesh still has the partition information?
I will be using elmer to solve this conjugate heat transfer problem. I am still using your LiveDVD beta 2, so, I do not think that I can export the mesh to unv format. I will give this a try when your next version is out (with Salome v3.2.1).
phsieh2005
- Massimo
- Topic Author
- Visitor
-
18 years 9 months ago #648
by Massimo
Replied by Massimo on topic Re:meshing of multi-materials geometry
Hi,
if elmer handles unv file format and groups, consider the opportunity to install the new Salome version.
It can be done either installing the DVD on the hard disk, or using the VMware version.
I didi it under windows, and it went smoothly. Probably you could do the same also under Linux. The drawback is you need a lot of memory. Nonetheless running the live DVD is memory intensive too..
The biggest advantage is if you make groups related to the geometry, if you remesh the geometry the geometry related groups will stay consistent.
Massimo
if elmer handles unv file format and groups, consider the opportunity to install the new Salome version.
It can be done either installing the DVD on the hard disk, or using the VMware version.
I didi it under windows, and it went smoothly. Probably you could do the same also under Linux. The drawback is you need a lot of memory. Nonetheless running the live DVD is memory intensive too..
The biggest advantage is if you make groups related to the geometry, if you remesh the geometry the geometry related groups will stay consistent.
Massimo
- phsieh2005
- Topic Author
- Visitor
-
18 years 9 months ago #649
by phsieh2005
Replied by phsieh2005 on topic Re:meshing of multi-materials geometry
Hi, Massimo:
Thanks for the reply!
The current beta 2 DVD has Salome v2.2.8. Does it support unv (with groups) output? I thought that only v3.2.1 supports unv export.
I did try to create groups based on partitions, that is, one group per partition. But, Salome won't let me. Although, I am able to create groups based on faces (but, this is for specifying BCs).
How about creating separate meshes, one mesh per partition (so, one will have Mesh1, Mesh2, ...etc)? But, then, there is no guarantte the nodes on the common faces will be identical if I do not use Mapped mesh.
phsieh2005
Thanks for the reply!
The current beta 2 DVD has Salome v2.2.8. Does it support unv (with groups) output? I thought that only v3.2.1 supports unv export.
I did try to create groups based on partitions, that is, one group per partition. But, Salome won't let me. Although, I am able to create groups based on faces (but, this is for specifying BCs).
How about creating separate meshes, one mesh per partition (so, one will have Mesh1, Mesh2, ...etc)? But, then, there is no guarantte the nodes on the common faces will be identical if I do not use Mapped mesh.
phsieh2005
Moderators: catux
Time to create page: 0.150 seconds