[Maddin]

Hey folks,

after years without CFD I'm back in contact for starccm+, may somebody can remind V4
Well I have V13 at the moment and the differences are really big.
Shitty Java interface but somehow the mesher is better?

Did somebody compare the mesher somewhere?

I make some compares at the moment and the mesh is always much smaller than in V4... 380k vs 1300k cells etc. same simulation, only new mesh.

Thanks for your time!

[SoAero]

I’m sure there’s plenty of resources generated in the past 7 years of releases about why your mesh might be different. I suggest starting with the release notes.

Also, you have not given much information to answer your question about why the mesh is different. What’s your application, what meshes are you using, what are their settings, etc...

[Maddin]

Where do I find the release notes?

Settings attached, as I wrote, I open an old file and cleared the generated mesh and made a new surface and volume mesh.

[SoAero]

The mesh is supposed to “equivalent” but not identical between releases. But there’s lots of incremental changes that can add up to a lot of change over 7 years worth of releases (21 total since they release 3 times a year).

Which mesh result is different? I see the settings, sure. But which mesher has changed?

[Maddin]

Seems to be the remesher which made a huge progress

Where do I find the release notes?

[SoAero]

Since Siemens acquired CD-adapco I’m not sure where all that stuff is anymore. Sorry.

I hate to be the guy that says, “google it” but that’s what I’d do.

[LuckyTran]

The polyhedral algorithm has been pretty much the same since v4 my opinion (they still use the 3 ray algorithm). The surface remesher has seen the most tweaks since first generation of the surface mesh dictates everything else. They have also gone through ups and downs. I.e. tweaking for more robust but higher cell count vs tweaking for higher quality vs tweaking for low cell count. I think the last big change was in v11, which still was not fundamentally different. One of the experiences that CD-Adapco has learned quite painfully is that real geometries are complex and customers are very unhappy when the mesh generation fails, even more so if it's because too many cells are being generated.

Where they have spent a lot of time though is developing the advancing layer mesher and towards better automation by using the pipeline. Also, you can mesh in parallel!

You won't find the details in the release notes, since they only say things like "tweaked settings." It's better to google the slides from the star global conferences, etc. because they contain developer notes and often tell you exactly what setting has been tweaked. Again, mostly tweaks.

[Maddin]

Yeah, found some notes via Google.

The GUI is a little big buggy but after some days I feel happy with the new version