Roll, Pitch, Yaw Rate

[Hrishav Das ae21b023]

Hi

While running a stability analysis I noticed that the roll rate, pitch rate and column rate for the run about which the stability analysis is done is mentioned at the start. Where might I look into the change these terms (which file holds these inputs). I checked my vspaero input file and there's no place where these terms are specified.

Thank you

[Hrishav Das ae21b023]

Where might I look to change these terms* (corrected grammar :)

[Rob McDonald]

Unfortunately, it is not exposed in any files, so you have to change it in source and recompile.

For a steady run, the deltas are here...

https://github.com/OpenVSP/OpenVSP/blob/main/src/vsp_aero/Solver/vspaero.C#L2786

For the unsteady run, I believe it is calculated here...

https://github.com/OpenVSP/OpenVSP/blob/main/src/vsp_aero/Solver/VSP_Solver.C#L564

Rob

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[Rob McDonald]

I neglected to mention...

In the (hopefully near) future, VSPAERO will calculate stability derivatives with an analytical derivative -- so this perturbation will not matter at all.

Rob

[Hrishav Das ae21b023]

Thank you very much!

[skyc...@gmail.com]

Slight side question here, is the same true for a single VSP run (not a stability run).  IE, is there a way to specify a roll rate for a single VPSAero run?

Thanks,

Bryan

[Rob McDonald]

Yes, but not through the OpenVSP GUI.

VSPAERO has a mode where it will apply a uniform roll rate about the x-axis to the model.  It is a steady solution.  It is meant to be a mode for simple isolated propeller analysis, but would work for the entire airplane if you want.

There are actually some instructions about this mode online...

https://github.com/OpenVSP/OpenVSP/tree/main/examples/vspaero_ex/Isolated_Rotor/Steady_Rotating_Frame

I haven't tried it in a long time, so I'm not actually 100% sure it still works....

Rob

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