Topology optimized part

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  • Last Post 06 October 2018
diptanshu18 posted this 04 October 2018

Hello all,

I am a new user of the topology optimization toolbox in Ansys. I was trying to get the topology optimized part back in spaceclaim. (I already optimized the part and I was trying to use the reshape the optimized part in spaceclaim but I keep getting an error which says

"Update failed for Geometry component in Model,static, structural . Update of the geometry component in Model, static, structural did not mark the component as updated due to a change made to the Results component during the update".

I am using the latest version of ansys. (19.1 Student version). I would really appreciate if anyone could help me with this problem. I have attached here a screenshot of the problem.

Thanks

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peteroznewman posted this 04 October 2018

Please reply with the Workbench Project Archive .wbpz file attached so I can see the whole project.

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diptanshu18 posted this 05 October 2018

Hi Peter,

Thanks for your prompt reply. I attached the archived file for you to see the problem. It would be great if you could look into it at your convenience. 

Diptanshu

 

 

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SandeepMedikonda posted this 05 October 2018

[EDITED]:

How are you inserting the last Static Structural Analysis system? I would recommend you to Right Click on the Results cell and Transfer to Design Validation System... Then right-click and update the solution cell of the topology optimization cell. Go the geometry cell of the newly inserted Static Structural analysis system and click on Refresh.

Regards,
Sandeep
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diptanshu18 posted this 05 October 2018

Hi Sandeep,

Thanks for your reply. Yes, that is exactly how I inserted the last Static Structural Analysis system. After that how do I access the optimized part in spaceclaim?

Regards,

Diptanshu

diptanshu18 posted this 05 October 2018

If I click on update on the geometry in the last Static Structural Analysis system it throws the error i mentioned in the post. Is there a solution for this?

SandeepMedikonda posted this 05 October 2018

Ahh Sorry, I intended to say Results but typed solution instead...

peteroznewman posted this 06 October 2018

That created a system where I had to Update Project, then I got this system:

However, the geometry in the Model C4 is the original geometry.

The Topology Optimization showed a reduced mass model in B.

All the above is being done in 19.2

Regards,

Peter

SandeepMedikonda posted this 06 October 2018

@Diptanshu

You would need to follow these steps:

@Peter

  By default the Topology Density will be exported as an STL. However, if there are more result objects in the tree (which doesn't seem to be the case here) it is possible that the defaults might change:

  Please check the following in the Solution settings:

Also, note that you can right-click on the result and just export it to STL:

Now, the reason you didn't see the optimized geometry is that after you right-click on C3 and click on Refresh. When you open the geometry in SpaceClaim, here you would notice that by default the optimized part is suppressed. You would need to Activate for Physics:

The intention is to un-suppress the optimized part, clean it up using SpaceClaim tools, convert it to a solid. Full CAD conversion can take some smoothing operation etc with the tools in Facets tab and then fitting geometric features to it. However, for a quick validation run. You can do this as shown:

Hope this clears it?

Regards,
Sandeep
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peteroznewman posted this 06 October 2018

Thank you Sandeep for the extra instructions. I completed a Topology Optimization one time more a few years ago and forgot the workflow.

After I switched to the Facet Body, made a solid out of it and brought that into Mechanical, the meshing threw an error.

Then I added Virtual Topology and it solved.

I can see that Topology Optimization should really include a significant geometry cleanup phase.

Regards,
Peter

 ANSYS 19.2 archive attached.

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diptanshu18 posted this 06 October 2018

Hi everyone,

Thanks for finding time to put in your inputs. I was able to export the optimized geometry by 'exporting as .stl' file. (The update thing on the geometry on the C block still didn't) work for me for some reason) Though I might have to try it again. I was able to clean the geometry and run simulation on it again. I would appreciate any comments on the same. I have attached here the pictures for your reference.

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SandeepMedikonda posted this 06 October 2018

Diptanshu,

  If you are having problems yes that is the way to do this. Note that whatever topology density retain threshold you are selecting is being transferred to the STL.

Now, once in SpaceClaim often at least a few operations are to be done to avoid the meshing problems as Peter mentions. I typically use these tools as a common practice to smoothen the geometry:

After Shrinkwrapping and using the Smooth, Reduce operations a few times you would end up with a reasonably cleaned up geometry.

Oftentimes at this point, I try to convert this to solid and take the geometry to Mechanical. If needed I would use the Virtual Topology to help with meshing as there are a significant number of surfaces. The suggestion is to use patch independent tet mesh.

Now, if you want to do a full CAD conversion, you would typically use the Skin surface tool and extract curves to build the entire CAD.

The method is a little involved but you get a CAD which is much smaller and easier to work with.

Regards,
Sandeep
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diptanshu18 posted this 06 October 2018

Hi Sandeep,

Thank you very much for your input. I used the sketch plane, copied the sketch and pasted on the existing sketch. I edited the sketch and then converted it to the model. That method resulted in the geometry changing a little but without sharp edges and non-uniform geometries in the  model. i will also go ahead and try your method for editing the geometry.

Regards,

Diptanshu

peteroznewman posted this 06 October 2018

Nice cleanup job.

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