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generate meshing refinement on necking area

hi there

briefing :

- i am trying to have the fatigue simulation. i have done my CFD simulation in acusolve and the output data (temp and pressure) is now mapped onto the structure for structural analysis (optistruct) > next target is fatigue

- during running the structural analysis simulation, the error kept coming out. and the latest one saying "poor quality mesh". as per attached

problem

- i need help in GENERATING QUALITY 2D meshing > 3D meshing. especially in the necking area of the manifold because that is the study area.

- ANY video, suggestion and tutorial is highly recommended. i have watched several tutorial to generate 3D meshing, but in my case, since i need to run in CFD and then to structural, my meshing should have the surface mesh, volume mesh and create the fluid volume as well.. just for your additional information

attached herewith is the model and the error files.

thank you in advanced for your time and help

error.PNG

thermal_stress_11March2022_6.hm

thermal_stress_11March202_run6.out

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AcuSolve

English

HyperMesh

OptiStruct

v2021.2

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acupro

Just trying to get clarification here. You're fine with everything you've done on the AcuSolve side, including the mapping (process anyway). From here, you need help to create the better quality OptiStruct mesh/model - to which you'll again need to map the AcuSolve results. So really this is a question for OptiStruct (or meshing for OptiStruct.) Is that correct?

And with which tool do you typically do your meshing (pre-processing) for OptiStruct?

acupro

Just trying to get clarification here. You're fine with everything you've done on the AcuSolve side, including the mapping (process anyway). From here, you need help to create the better quality OptiStruct mesh/model - to which you'll again need to map the AcuSolve results. So really this is a question for OptiStruct (or meshing for OptiStruct.) Is that correct?

And with which tool do you typically do your meshing (pre-processing) for OptiStruct?

In the meantime, I looked at your mesh a little and found some interesting areas. Here's one:

Second image is zoomed and rotated a bit. This is on the outside surface of the solid. There's some sort of offset ending in really small angles at the ends. Is this the area giving the problems? You could correct the geometry, or suppress some edges to 'walk over' this area without explicitly capturing the tiny surfaces. You could suppress edges in other areas as well, to avoid creating mesh elements with tiny angles.

There are some areas with similar issues on the inside/fluid surface where some edges could be suppressed to avoid small angles:

Intan Kushairi

Just trying to get clarification here. You're fine with everything you've done on the AcuSolve side, including the mapping (process anyway). From here, you need help to create the better quality OptiStruct mesh/model - to which you'll again need to map the AcuSolve results. So really this is a question for OptiStruct (or meshing for OptiStruct.) Is that correct?

And with which tool do you typically do your meshing (pre-processing) for OptiStruct?

hi there, thank you for replying my questions.

yes, inded, the question is for meshing for optistruct, because when running in acusolve, no issue, however when running in Optistruct, the solution kept stop immediately.

i have done some modification (toggle, edit lines) and currently having issue with some thin part especially the gasket part.

i have read some info, for gasket, we need atleast 3 layers? is that true?

is there any related tutorial/video for the gasket meshing?

acupro

hi there, thank you for replying my questions.

yes, inded, the question is for meshing for optistruct, because when running in acusolve, no issue, however when running in Optistruct, the solution kept stop immediately.

i have done some modification (toggle, edit lines) and currently having issue with some thin part especially the gasket part.

i have read some info, for gasket, we need atleast 3 layers? is that true?

is there any related tutorial/video for the gasket meshing?

I do not have expertise on the structural/OptiStruct side. I do see this is also on that Forum, so hopefully somebody there can assist. Otherwise, you may wish to submit a support ticket.

ydigit

You could use two different meshes for AcuSolve and OptiStruct, with each optimized for respective solvers.

The one way mapping process does not require the same mesh for both solver. e.g.

https://2021.help.altair.com/2021.2/hwsolvers/acusolve/topics/tutorials/acu/acu_3110_intro_sl_r.htm

Probably someone with more OptiStruct experience will be able to help with that error.