MeshLink | Parametric Evaluation

pdp.aero · August 9, 2021, 09:37

Hi there,

I have a question.

I am wondering if MeshLink provides mesh derivatives with respect to a geometry parameter.

Let's say there is a wing that has been meshed and now does the "evaluation of computational geometry" in MeshLink mean I can get mesh derivatives for example with respect to the span length?

I see parametric evaluation in geometry kernel in the doc but I am not sure this is what I think it is.

If this parametric evaluation doesn't do exactly what I need, could you please give mesh some advice how I could do this through MeshLink?

I know I can change the span a bit and do finite difference but I am interested in implementing automated differentiation to get mesh sensitivities.

Cheers,
Pay

dgarlisch · August 10, 2021, 14:07

The current Pointwise MeshLink implementation only exports to the Geode NMB cad format. You will need to request access to Geode via Pointwise support. MeshLink + NMB +Geode will give you access to the geometric data to which the surface mesh is constrained.

pdp.aero · August 10, 2021, 16:54

Quote:

Originally Posted by dgarlisch

The current Pointwise MeshLink implementation only exports to the Geode NMB cad format. You will need to request access to Geode via Pointwise support. MeshLink + NMB +Geode will give you access to the geometric data to which the surface mesh is constrained.

Thank you David. I know about Geode and have already requested for the beta testing access; though haven’t heard yet.

I guess I have to see if through those data I could get mesh sensitivities with respect to a geometric parameter let’s say.

Looking forward to this very interesting tool.

Best,
Pay

dgarlisch · August 11, 2021, 14:09

It is my understanding that MeshLink will only give you the relationships between grid data and the CAD curves/surfaces to which they are constrained.

With this linkage, your application can query info about the CAD data, project points to the appropriate entities, etc. This permits you to refine a mesh and keep it conformal to the CAD.

MeshLink itself does not provide any kind of analysis information.

Maybe someone else can clarify this.

pdp.aero · August 13, 2021, 01:32

I also think the same way. I have to do the sensitivity analysis through MeshLink.
I am thinking what is the best way to obtain sensitivities. I know some do finite difference.

August 9, 2021, 09:37	MeshLink \| Parametric Evaluation	#1
pdp.aero Senior Member Pay D. Join Date: Aug 2011 Posts: 166 Blog Entries: 1 Rep Power: 14	Hi there, I have a question. I am wondering if MeshLink provides mesh derivatives with respect to a geometry parameter. Let's say there is a wing that has been meshed and now does the "evaluation of computational geometry" in MeshLink mean I can get mesh derivatives for example with respect to the span length? I see parametric evaluation in geometry kernel in the doc but I am not sure this is what I think it is. If this parametric evaluation doesn't do exactly what I need, could you please give mesh some advice how I could do this through MeshLink? I know I can change the span a bit and do finite difference but I am interested in implementing automated differentiation to get mesh sensitivities. Cheers, Pay

August 10, 2021, 14:07		#2
dgarlisch Senior Member David Garlisch Join Date: Jan 2013 Location: Fidelity Pointwise, Cadence Design Systems (Fort Worth, Texas Office) Posts: 307 Rep Power: 14	The current Pointwise MeshLink implementation only exports to the Geode NMB cad format. You will need to request access to Geode via Pointwise support. MeshLink + NMB +Geode will give you access to the geometric data to which the surface mesh is constrained. pdp.aero likes this.

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August 11, 2021, 14:09		#4
dgarlisch Senior Member David Garlisch Join Date: Jan 2013 Location: Fidelity Pointwise, Cadence Design Systems (Fort Worth, Texas Office) Posts: 307 Rep Power: 14	It is my understanding that MeshLink will only give you the relationships between grid data and the CAD curves/surfaces to which they are constrained. With this linkage, your application can query info about the CAD data, project points to the appropriate entities, etc. This permits you to refine a mesh and keep it conformal to the CAD. MeshLink itself does not provide any kind of analysis information. Maybe someone else can clarify this.

August 13, 2021, 01:32		#5
pdp.aero Senior Member Pay D. Join Date: Aug 2011 Posts: 166 Blog Entries: 1 Rep Power: 14	I also think the same way. I have to do the sensitivity analysis through MeshLink. I am thinking what is the best way to obtain sensitivities. I know some do finite difference.