Changing direction of flow in VWT

exx077

Hello,

 

I am using VWT to access to the surface pressures on a model. These are then to be exported and applied to the model within HyperMesh via linear interpolation.

 

I recently came to realise that if I move the model in VWT then the nodal pressure coordinates that I can then export to a .txt file are wrong. They do not align with the nodal coordinates of the model within HyperMesh, but refer to the region of space that they occupy in VWT.

Thus, you must translate and rotate the model in HyperMesh first. This is justifiable and works for just one loading scenario.

 

The problem I am having is that I wish to do a weighted compliance topology optimisation with multiple loading scenarios that require the angle of incidence of the flow to change.

Therefore, if I rotate the model, the pressure files nodal coordinates will change and I will not be able to use the same hypermesh file (as it will have to be rotated accordingly too).

 

So, is there a way to change the direction of the flow or rotate the windtunnel within VWT - so that my model can stay constrained in its geometrical space but the loading scenario can change?

 

Thank you in advance.

ydigit

In this case you would probably want to go to AcuConsole to do these changes. The 'FarField' boundary condition can be useful.

It might be easier if you had a 1-1 talk with your local Altair UK support on this topic.

 

ydigit

ACU-2100: Turbulent Flow Over an Airfoil Using the SST Turbulence Model, in the AcuSolve_2017.1_Training_Manual.pdf  in your AcuSolve installation folder has an example of far field boundary condition. This has an airfoil with varying angle of attack, by changing inlet direction instead of moving/rotating the airfoil.

exx077

Hello @ydigit,

 

I am unsure as to how I access the AcuSolve Training Manual.

Do I find it from within AcuSolve's help menu (as discussed here - https://altairuniversity.com/10463-acusolves-reference-manuals-tips-tricks/)?

Would it be possible to share the PDF with me?

 

Thank you for your help

ydigit

 

 

Each AcuSolve installation has this folder, whether Linux or Windows. You can find all PDFs there.

 

ydigit

For Windows, try

...\AcuSolve\Win64\doc folder.

exx077

@ydigit,

 

Thank you, I will have a go and come back to you on this forum post.