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Creating non-design space

Altair Forum User

Hi,

I want to assign non-design property to the engines in my aircraft model.

As,I realize during optimization run that I don't need the engines to be part of the optimization process.

But, I have already done the following steps:

1. All the components are combined as a single solid using Boolean option in HM.

2. Exported the parasolid file and created mesh in 'INSPIRE' and exported FEM from Inspire.

3. Then , extracted faces in HM.

4. Run the model in VWT for CFD.

5. Imported loads from VWT to HM.

Is there way, I can put engines in the non-design space now ? OR is there any other way to make the engines to NOT to be part of the Optimization process.

I am really short on time. It would be really nice , if somebody can provide support in this context.

Looking forward to a timely response.

Thank you.

Garima

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Rahul Rajan_21763

Hi,

If you want to carryout topology optimization of Entire aircraft model.Then Designable and non designable concept would be good.

For analysis material property is needed.Using organize command you can move elements of Engine region to newly created non design component collector.

For more info refer Optistruct Topology optimization tutorial.

Regards

Rahul R

Altair Forum User

Hi Rahul,

Thank you for your reply.

Yes, I am interested in doing topology optimization of the entire aircraft .

OK , but next concern is : How to select only engine elements?

Because whole aircraft is meshed as one component, in Inspire.

And, If I select manually , there are chances that I might miss some small elements or some background elements may also get selected.

Can you help with this.

Looking forward to a timely response.

Thank you.

Garima

Rahul Rajan_21763

Hi,

Its a common practice that while meshing we keep elements in appropriate collector.Since you have used Inspire and made one solid for entire aircraft.I would recommend you to organize element of engine region with approximation.

You can keep entire meshed model in wireframe mode & geometry of engine potion in shaded mode and then by using organize command move select/deselect element of engine region.

Regards

Rahul R

Altair Forum User

Hi Rahul,

I was able to do that through approximation.

But , I just noticed that, when I go to count option in tools. I see no count in geometry. How can this be possible?

The geometry was exported to Inspire and after meshing , I used .FEM file generated to open in HM.

Is it something I need to worry about ? will it effect optimization ? I am supposing yes ..

Can you help with this?

Looking forward to a timely response.

Thank you.

Garima

Rahul Rajan_21763

Hi,

. fem is the solver deck file for Optistruct hence it contains only nodes and element but no geometry.

you can save fem as .hm file.Then you can import entire Geometry or only engine geomtery in hypermesh.

Regards

Rahul R