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Meshing Process

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Old   September 11, 2015, 22:59
Default Meshing Process
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Dear Experts,
I am new to CFD domain, so needed some help regarding the meshing process.
Right now I am working on a project of underhood thermal management using Star CCM as solver.

Now I want some guidance that how meshing process works when we are dealing with meshing of different parts with the control volume.

In the solver there are three different places where the meshing parameters are mentioned, they are
1) The Mesh Continua
2) In the "Regions" node
3) In the individual "boundaries" of the "Regions" node.

It is easy for me to understand that how the meshing at the part level is done, but how these different parts are connected in a control volume to form a Single volume mesh, by defining mesh at different level, is difficult to grab.

So it will be really great help, if someone can can guide me along the process of meshing i.e how the entire mesh is generated from the part level till the control volume and how they are connected, by defining the mesh parameters at different levels.

Thanking You,
Sidharth.
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Old   September 13, 2015, 20:08
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1. Your question implies you are using region-based meshing, which is obsolete. I highly recommend you switch to the part-based meshers. Consult the user guide.

2. I can't say I understand your question though. You have global settings for the meshers which apply certain parameters to all surfaces and certain parameters to the core volume, and you can apply custom settings to either of these. The code figures out the sizing based on your parameters and determines how to transition from one to another.
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Old   September 15, 2015, 00:43
Default region based meshing
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Hi sid,

##################
region- R
part based meshing- PBM
region based meshing- RBM
####################

I hope you are aware of meshing process in PBM, so without dragging into ocean i'll just stick to your pool of questions.

1) THE MESH CONTINUA
here in RBM it is somewhat different compared to PBM. here we define each mesh continua for each region. say you have 3 R's R1, R2 and R3. then you need to define 1 mesh continua for each region.

2) IN THE REGIONS NODE
lets keep it default for the time being, since, it have different parameters to be defined for different mesh models you select under models in mesh continua.

3)IN BOUNDARIES
as we have surface control in PBM here in RBM we define custom sizes under this node. say you have some small parts whisch has to have small mesh size, just select custom surface size under mesh conditions and define the surface size in mesh values.

on a whole PBM is much easier comapre to RBM. yet, the choice is your's.

Cheers,
bharat
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Old   September 15, 2015, 02:30
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Hi bharat,
Thank you for the guidance. .
I just had one more question that if I need to define a solid mesh in my CFD simulation then, do I need do to it in the PBM, or in the RBM I need to define a solid region and define the mesh continua accordingly..?
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Old   September 15, 2015, 03:31
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Quote:
Originally Posted by sidharth9426 View Post
Hi bharat,
Thank you for the guidance. .
I just had one more question that if I need to define a solid mesh in my CFD simulation then, do I need do to it in the PBM, or in the RBM I need to define a solid region and define the mesh continua accordingly..?
well, i suggest you to stick with one method (PBM or RBM) to aviod confusion. coming to query, define that region(solid) seperately and another a mesh continua for it(in RBM).

bharat
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