CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > Siemens > STAR-CCM+

mesh strategy

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 9, 2016, 05:51
Question mesh strategy
  #1
Member
 
Join Date: Jan 2015
Posts: 40
Rep Power: 11
philus is on a distinguished road
Hi all,

my question is quite general and about the strategy on how obtain the best mesh:

Imagine to have the geometry shown in the picture attached: a semi-spherical surface (zero-thickness), a cylinder and a rectangular prism. I am interested to the external aerodynamics of these objects and I want split the computational domain along the plane of symmetry also shown in the picture for decrease the total number of cells. I expect a prism layer mesh on each surface except the volume walls. The rectangular prism must be also meshed in its interior, I hope then a conformal mesh between the inside and the outside of this solid. Imagine also that all geometries can be quite dirty so they may requires a surface wrapping.

I tried the following strategy:
1. wrap sphere and cylinder
2. wrap rectangular prism
3. create fluid block defining the symmetry plane
4. under part operation subtract all geometries to fluid block
5. under part operation intersect rectangular prism and fluid block
6. send intersection and subtraction to region
7. create interfaces selecting prisms surfaces in both regions
8. change fluid block surfaces in subtraction region to symmetry in order to avoid prism layers
9. create automated mesh (surface remesh + repair + polyhedral + prism layer + thin mesh)

But I'm not happy with that because the mesh isn't conformal on each side of the rectangular prism, because the semi-spherical surface now has a thickness (corresponding to the 25% of the wrapping cell size I think), and because I don't have any prism layer on surfaces.

You, lovely user familiar to Star-CCM+, which strategy would you prefer to correctly mesh my problem?

Thanks in advance,
philus
Attached Images
File Type: png problem.png (20.0 KB, 31 views)
philus is offline   Reply With Quote

Old   March 11, 2016, 02:51
Lightbulb
  #2
Member
 
Join Date: Jan 2015
Posts: 40
Rep Power: 11
philus is on a distinguished road
news:

I discovered I have to imprint intersection and subtraction otherwise I cannot get a conformal non intersecting mesh!

thanks to cd-adapco support!
philus is offline   Reply With Quote

Reply

Tags
conformal meshes, mesh 3d, prism layer, star ccm+, surface & solid bodies

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
sliding mesh problem in CFX Saima CFX 46 September 11, 2021 07:38
how to set periodic boundary conditions Ganesh FLUENT 15 November 18, 2020 06:09
[Gmsh] Serious problem with mesh strategy????? tareqkh OpenFOAM Meshing & Mesh Conversion 16 August 3, 2015 07:19
[ICEM] Generating Mesh for STL Car in Windtunnel Simulation tommymoose ANSYS Meshing & Geometry 48 April 15, 2013 04:24
[snappyHexMesh] Layers:problem with curvature giulio.topazio OpenFOAM Meshing & Mesh Conversion 10 August 22, 2012 09:03


All times are GMT -4. The time now is 15:58.