|April 3, 2006, 10:23||
STAR CCM+ v2
Does anyone has information about STAR CCM+ V2? What else could I expect compared to V1. Did any of you attend the conference in London 2 weeks ago ?
I heard there is underhood features in it now, do you know the other new features it has inside? i am wondering if I should upgrade from v1 to v2.
|April 3, 2006, 11:30||
Re: STAR CCM+ v2
The primary new feature of the pending 2.02 release of STAR-CCM+ is the integration of next-generation meshing tools into the existing STAR-CCM+ product. The goal of this integration is to shift your starting point upstream. Rather than requiring you to import a volume mesh generated outside STAR-CCM+ (in pro-am or a 3rd party tool), you can now import a surface mesh and proceed through the Volume Meshing > Solution > Analysis procedure without ever leaving STAR-CCM+. In addition to streamlining your overall process and allowing you to master just a single tool, this release provides a much more flexible product where you can easily iterate between meshing and solution as needed to achieve a high quality CFD result.
For this release, previous meshing technology in ammbatch was completely rewritten from the ground up. The goals of the rewrites included:
* Improvements in CPU and memory use over ammbatch meshers
o Surface wrapper: ~6x faster, ~3x memory reduction
o Tet mesher: ~3x faster, ~4x memory reduction
o Poly mesher: ~3x faster
o Trimmer: ~3-4x faster, ~2x memory reduction
o Prism meshing (subsurface + extrusion): ~10x faster, ~2x memory reduction
* Improvements in mesh quality
o Surface wrapper: Much better retention of features
o Surface remesher: Accurately coarsens/refines surface meshes while maintaining original geometry
o Poly mesher: Uses solver-based validity metrics to optimize mesh
o Trimmer: High fidelity to surface details
o Prism meshing: Quality metrics built into subsurface process to guarantee high quality subsurface
* Improvements in mesh robustness
o Surface wrapper: 100% guarantee of a closed, manifold surface after wrapping
o Poly mesher: Post processing codes to eliminate negative volume or invalid cells
o Trimmer: 100% guarantee of zero "unresolved cells" or CP errors
o Prism meshing: Post processing of extrusion cells to eliminate negative volumes
* Improvements in coordination between meshers
o New embedded "pipeline" takes the mesh through the various meshers without relying on disk I/O
o Pipeline model gives the user the ability to generate a high quality mesh with just one click
At this point, this meshing release cannot yet be considered a replacement for pro-am. There are many powerful features in pro-am (manipulating meshes, set manipulation, etc.) that have not been migrated into STAR-CCM+. In cases where you really need a fine tuned control over your meshing process, you must still rely on pro-am. For many cases, though, where you want to import a surface, set some meshing options, and generate a mesh without extensive interaction, the STAR-CCM+ meshing functionality is the ideal choice. Unlike STAR-Design and the other STAR-CAD products that give you "one click" meshing but minimal control, STAR-CCM+ 2.02 will expose many more options in the meshers while still preserving the "one click" idea. In addition, there are defined exit/entry points in STAR-CCM+ that allow you to get your model into pro-am, tweak it, and get it back into STAR-CCM+. The two places where this is possible are:
* Modifying (fixing, improving, etc.) a surface mesh generated in STAR-CCM+:
o Export any surface mesh from STAR-CCM+ into .dbs format.
o Read the .dbs file into pro-am, modify it as needed, then re-export.
o Reimport the modified (or new) .dbs file into STAR-CCM+.
* Modifying (fixing, improving, etc.) a volume mesh generated in STAR-CCM+:
o Export a generated volume mesh using the .ccm format.
o Read the .ccm file into pro-am, modify and re-export.
o Read the modified .ccm file back into STAR-CCM+.
* Surface-to-surface radiation
* Discrete ordinate radiation
* Heat exchanger (radiator) Method 1
* Transition model (laminar to turbulent)
* Volume of fuid (VOF)
* Multi-species (active scalars)
* Eddy-breakup combustion
|April 3, 2006, 15:03||
Re: STAR CCM+ v2
also got moving mesh (rotating, not just mrf) also got speed improvments. I have had a crack at the beta (its been available for a while) and it seems really good, certainly the mesh side is so easy, and has some really clever touches. I havent used much of the other stuff, some vof, which is comet vof and so should be fairly good.
|April 3, 2006, 16:31||
Re: STAR CCM+ v2 - have a go with the macros!
You can record a macro java.macro that:
read case .sim
change one parameter
run the case for n iterations
save the post-processing
save the new .sim
then running via shell command is:
starccm+ -batch java.macro > output.log
starccm+ -help as in star to run multiple processors,
running in parallel is as easy as in star-cd. May be easier.
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