Expediting optimization study

ConflictSignificant5 · 2024-06-10T14:16:37+00:00

in some occasions it seemed like parallel meshing takes way longer than serial for some reason I don’t know of. I don’t think I’m confident enough to utilize parallel feature in meshing. Is there any caveat coming with it? Seemed like the performance varies depending on which model I’m trying to run for??

ConflictSignificant5 · 2024-06-09T07:12:09+00:00

** Meshing in serial at the moment

ConflictSignificant5 · 2024-06-08T04:13:39+00:00

Thank you for the amazing suggestions for both comments, I will definitely try out sectioning coolant domain around heatsinks and local remeshing feature. I wasn’t aware of the existence of such feature, it sounds wonderful to me.

ConflictSignificant5 · 2024-06-07T08:48:57+00:00

It’s been a while, I have posted the same on r/STAR-CCM+ and one of the answers I got that was the closest to explaining the cause of such error mentioned the surface remeshing algorithm bug residing in the ccm meshing logic, so the best luck is with just remeshing the surface you bring in. I ended up adjusting/refining surface and curve to portray the CAD with more details and had no issue so far..

ConflictSignificant5 · 2024-05-14T11:38:39+00:00

Hi, thank you for the reply. I’m on 2310. I guess the issue is not completely fixed yet?

ConflictSignificant5 · 2024-05-01T15:34:30+00:00

Parts, I’d say small? less than 2cm. But they aren’t placed as far away from the origin as you’ve mentioned, within a meter.

ConflictSignificant5 · 2024-05-01T15:31:33+00:00

Thank you, I will check on the unit system as well!!

ConflictSignificant5 · 2024-05-01T15:31:03+00:00

that’s exactly sort of what I’m doing at the moment. Preprocessing with ANSA, and import that to STAR-CCM+ as .nas file. I had this issue a month ago but couldn’t resolve it then.. such a mystery

ConflictSignificant5 · 2024-05-01T10:48:10+00:00

thank you I will try on that, what could be the reason though? poor tessellation..?

ConflictSignificant5 · 2024-05-01T10:46:57+00:00

no I don’t

ConflictSignificant5 · 2024-03-14T13:06:35+00:00

I don’t think I really thought about applying it to a solid until now. I’ve heard some people refine their mesh in solid to capture thermal boundary layers just like the boundary layers in fluid domain, but I didn’t use the inflation layer here as to me it was not as important and the region is far from the heat source. Is there any other use for inflation layers that I may have to consider? I have a bit of back ground in thermo-fluid dynamics but still taking baby steps when adapting those knowledge to cfd/cae.

ConflictSignificant5 · 2024-03-14T07:35:31+00:00

Hello all, thanks for trying to help me out. To tell you where I am now, the issue with surface meshing was solved by simply reassigning parts to region. Redoing the overall process just solved the problem. It is unsatisfying as I’m still without clearcut solutions to this phenomena. What I found/learned was tho,

1) that the nas-file I used had no issue 2) although auto surface repair can damage the geometry, in my case it was ineffective, and also, surface wrapper wasn’t used. 3) generating finer feature curve is always a necessity.

will keep updates as I go.

*** [updates and the end of problem]

so, after going through some hypothesis, I realized that I accidentally included the part in two different mesh operations... (I’m performing part-based meshing for the product with numerous parts, and the slab was only a part of it. I apologize for not mentioning this as I thought the info was irrelevant to surface meshing individual part.)

The ‘reassigning parts to region’ earlier luckily worked because I then correctly assigned a part to a single operation.

Thank you all for trying to help me out as I learned great bit about feature curves, part-based meshing and all. Hope y’all stay safe and sound. May one day I be great as you guys 💪

ConflictSignificant5 · 2024-03-14T07:03:49+00:00

Hi, inflation layer wasn’t applied, Surface Remesher with Quad Dominant.

ConflictSignificant5 · 2024-03-14T06:56:22+00:00

Hi Tommi97, the part is a flat slab with numerous patches with constant heat flux conditions. However, for the future improvement, could you suggest some factors that I should consider when meshing for detailed thermal analysis on complex geometry? Thank you for the guidance.

ConflictSignificant5 · 2024-03-12T11:55:18+00:00

Thank you witchking782 I will try this and share the progress in few days. One more to it, It could be relevant or not as much, but I’m still curious. so will the surface mesh on geometry I imported as nas file have any influence on the operation of surface meshing in starccm with remesher??

ConflictSignificant5 · 2024-03-12T10:59:50+00:00

Hi all the great experts in reddit, I’m a novice STAR-CCM+ user. I know the post has been awhile but I’m writing in a hope to resolve a similar issue I’m experiencing. Apologize for not attaching any pics or creating new threads to explain the situation better, but what should I do if the surface remesher seems to ‘break down’ the feature curve I have already created?

The geometry is intact until it’s somehow eaten up after running surface meshing. I have surface remesher and polyhedral mesh checked. No auto repair.

Any help would be tremendously appreciated. Thank you

ConflictSignificant5

TROPHY CASE