Problem with using the Delaunay volume mesh method
 

Hello Everyone,

I have been trying to create an unstructured mesh around a Formula 1 model. I have tried using the Delaunay method to create a volume mesh around the car but the volume mesh created exceeds my defined test space.

The issue is indicated in these photos..

https://www.dropbox.com/s/7ruobmj8xpbbk60/Capture.PNG

https://www.dropbox.com/s/7bnyt87uwnulcz2/capture2.PNG

I don't seem to understand why this happens. There might me something that I am doing wrong in my set up process so I will list the steps that I took in creating the mesh.

1. I imported the geometry, Then created the Inlet, outlet and Farfield parts. Created a body called Fluid.

2. I used the global mesh setup to define my max element size to be 4. (The test space is 10 by 20 by 10)

3. In shell mesh setup, I chose All tri and Patch Independent.

4. In volume mesh set up, selections are tetra/mixed, quick (Delaunay) and scaling factor:1.2

5. In part mesh setup, I defined the max element size on the car to be 0.05 and left all other parameters to be 0.

6. Compute mesh; surface mesh and generated a surface mesh. (image below)

https://www.dropbox.com/s/ll9q6291woxbai4/Capture3.PNG

7. Finally Compute mesh> Volume mesh I chose tetra/mixed, quick (delaunay) Volume part name: Inherited

I would be extremely grateful if I someone can show me where I am going wrong.

Thank you very much in advance!

Best Regards,

Manahara

reduce the max size and try again...

It happens some times when i try to create delaunay mesh. I dont know why, but i usually play with size

same problem i had in formula one meshing : http://www.cfd-online.com/Forums/ans...ula-one-6.html

Thank you very much! I am going to try a octree mesh, then delete the volumes and create a delaunay rather than from surface mesh to delaunay. Hopefully it works!

THis las approach is better, and I usually do this approach!!! first octree and then Delaunay...
The same if you use Shell meshin with patch independent and then delaunay!!! is the same thing!!

There is actually a icon for this in the selection tool bar. Go to "delete elements" and the then use the very right button in selection tool bar.

1) Octree meshing
2) Saving Project
3) Delete Volume
4) Run delauney


will not fit it for me :(

what is the problem. This procedure is pretty quick to produce high quality meshes

Hey, sometimes defining the material body helps to avoid this 'mesh leak'.

Oh and also do not forget to run the geom topology check for holes.