Multi Resolution NGon

[Koaib Kaleem]

Hi,

Can someone kindly guide me about the process to generate the multi resolution mesh. I referred to the 2025 Workshop VSPAERO Theory & Updates video. It says  'd-res' and that the finest mesh is generated first and then coarsened with all levels written to a single .vspgeom file, but I cannot find this option.

Can someone tell me the approach?

I am planning to use this capability for a mesh convergence study for aero analysis on a fighter aircraft geometry.

Any help and relevant resources will be helpful.

Thank you.

[Rob McDonald]

The built-in multi-resolution support only exists in OpenVSP, it has not been utilized by VSPAERO yet.  Consequently, this capability is not useful to you or anyone else.

Since it is an experimental feature, the options to turn it on are suppressed by default.  Once VSPAERO has been extended to support it, the option will be un-suppressed.

To do a mesh resolution study, you should simply change the tessellation settings as you want and generate separate models for each run.

You might want to look into Variable Presets and/or Modes.  You can use these features to set up different resolutions (fine, medium, coarse) and then you can easily switch between them.

Rob

[Koaib Kaleem]

Sorry, but I am a little bit confused.

"The built-in multi-resolution support only exists in OpenVSP"

If there is this option in OpenVSP, then can't the same model be exported to VSPAero, or is it that it is suppressed in OpenVSP too until VSPAero catches up?

Consequently, the advantage that coraser mesh is strict subset of finer mesh could not be of use for now? Right?

Is there a rough timeline for when VSPAERO support for this feature is expected?

also i have one more question that can we export the mesh from the CFDmesh capability and utilize this mesh in VSPAERO?

thx

[Rob McDonald]

On Thursday, June 25, 2026 at 9:07:59 AM UTC-7 kkalee...@gmail.com wrote:

Sorry, but I am a little bit confused.

"The built-in multi-resolution support only exists in OpenVSP"

If there is this option in OpenVSP, then can't the same model be exported to VSPAero, or is it that it is suppressed in OpenVSP too until VSPAero catches up?

The multi-resolution feature in OpenVSP writes out a *.vspgeom file with more information in it.  Instead of just one mesh, multiple meshes get written to a single file.

VSPAERO does not yet know what to do with that extra information in the extended file.  It will not work with it at this time.

The option is suppressed until VSPAERO support exists for it.  The code is in there, but only so that developers (me and the VSPAERO developer) can create the files for testing -- and to help develop the extensions to VSPAERO that will utilize the file.  This capability is not useful to anyone else.

If you really want it, I can show you how to access it.  However, you would then need to develop a tool to strip the *.vspgeom file down into separate files -- one for each embedded resolution.  That seems like a lot of hassle for little gain.

 

Consequently, the advantage that coraser mesh is strict subset of finer mesh could not be of use for now? Right?

Is there a rough timeline for when VSPAERO support for this feature is expected?

No, it is not on the development roadmap at this time.

 

also i have one more question that can we export the mesh from the CFDmesh capability and utilize this mesh in VSPAERO?

Technically yes.  You will need to run VSPAERO from the command line to make this work.

In addition, the solutions are expected to be worse.  CFDMesh creates an isotropic mesh that does not resolve leading edges as well as the normal path.

Rob

[Koaib Kaleem]

Right, got the point. Will check out the tesselation setting approach. thank you for the guidance