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Preprocessing of OptiStruct in Simlab and HyperMesh

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1. Is it okay to mesh the model, assign material properties and forces in SimLab, then export it as an .fem. Then import the .fem into HyperMesh and set up the optimization. I have done it (I think the meshing part is easier in SimLab), and it seems to work, but I just want to make sure so that I don't miss anything, so that no information gets lots or so.
 

Answer: Yes, that is perfectly fine. You can exchange .fem (which is the input format of OptiStruct) between Simlab and HyperMesh and the data will be transferred from one program to the other. You would also have the option of setting up the optimization within the Simlab "Optimization" Ribbon (probably with not as many options as HyperMesh )


2. I have tried to create a new component in SimLab around the holes, but I don't get it to work. I'm not quite sure which operation I should use to make it correct. I still want the "new component" to be in contact with the old, in the same way as if they were one component. Do you have any good tip? 
 

Answer: I am not sure how to do this in Simlab (as I am not familiar with the software). It seems that you would need to create to separate bodies and organize your elements within the new body.

Here is how it is done in HyperMesh:

- Create a new component and Property

- Use the Mesh - Organize funktion (F11) to select your elements by window (shift + left mouse) and then click "move" to transfer the elements to the new component


Kind regards
Jan

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1.From 14.0 version of simlab one can setup topology & free shape optimization. Setting optimization deck is easy in simlab.

http://www.altairuniversity.com/wp-content/uploads/2016/01/SimLab-How-to-setup-topology-optimization-in-SimLab.pdf

 

2.While meshing in simlab one can have separate body using mesh control or with break option one can achieve multiple body.Design space can be defined after entering optimization.

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Hi!
1. When I do the optimization in SimLab I can't see the results, and I recive the folowing message:
 
 The .out file says that the optimization has converted, and feasible design, but may be there is something else that is wrong?
I have also tried to import the result file (des.h3d), but there is no result. Please find the .out attached.

2. I tried to create 2 bodies in SimLab, by doing the following: Geometry > Break > Body. And the meshed the two bodies, but I don't think I get any connection between them, please see the attached image. The two plates has the same material, propertiy, and load case, the only different is that the above plate has two bodies. What should I do?

Thanks!

1_2_body.png

Plate_1_opti.out

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Hi,

You should plot output in Hyperview for optimization results.Simlab postprocessor currently don't support topology optimization results.

After using break command you should use remesh command to maintain same density on both body. I hope you may have connectivity issue.

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Ok, thanks then I know.

 

Now I did the following: 2D Mesh - Geometry > Break > Body - Re-mesh both components - Solid Mesh. However, I still receive the same result as the first picture above, so I still don't get any connection between the two bodies. Is there something I have done wrong, or is there any other option I could try? 

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I see you have not a common face for two body & optimization setup is also not available in your model.

Will work on your model and share you setup through video.

Swe likes this

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Yes, I have tried to use the join option on the assembly page, but I still don't get any contact between the two bodies. When I solve the problem, I still get only one colour around the circular body (as in the picture above), which I don't think is right.

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Setting up the optimization parameters works fine. Just a few questions, if you compare the set up in SimLab with the set up in HyperMesh, is the option "Fraction of design volume" in SimLab defined in the same way as the option "Volumefrac" in HyperMesh? Respective "Compliance of a static subcase" in SimLab and "Compliance in HyperMesh"? And, the size constrain "minimum thickness" in SimLab does it correspond to the "mindim" option in HyperMesh?
 

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Hi, 

How can i convert simlab meshed file to hm. file.

 

I can convert it to FEM file...

 

After meshing in simlab...My purpose is to edit the mesh along with CAD in hypermesh again..

 

Is it possible?...

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Hi,

you can not export currently FEM and geometry together from SimLab to Altair HyperMesh.

 

HyperMesh requires the FEM to be associated to the CAD geometry: this does not happen in SimLab. Actually, the CAD geometry is not even present in the SimLab database, since it remains written in its original file (parasolid, step, CATIA and so on).

My suggestion is to do all editing within SimLab, and finally export the mesh as *.fem into HyperMesh.

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