MachUp 4 to MachUpX

[Mathiu Berrazueta]

Hello, I am new to aerodynamics. I want to solve a wing in MachUpX, I can do it in MachUp4 but now I don't know how to set the json file to run in Python.

I installed MachUpX and ran examples with no problems.

Can anybody help me please.

[Cory]

MachUp 4 input files are not compatible with MachUpX. You'll need to translate the input file into the format MachUpX recognizes. They are similar, but there are also some significant differences. It's all explained in the docs (https://machupx.readthedocs.io/en/latest/).

[Lucas]

Also the lab made a great video to tintroduce everything : https://www.youtube.com/watch?v=KLZWTqD8GhM&t=1032s

A good start is to look at the examples available in the file you download, then you modify it to suit your case.

[Mathiu Berrazueta]

Thanks for answering me.

I am running the tutorial example, but I have this error.

I attach the files.

Please can you explain to me what is wrong?

[Lucas]

Hi,

First, this error means that the algorithm cannot achieve convergence within the maximum iteration limit. To have a better understanding in the convergence you shoud add verbose=True in solve_forces parameters. It shows that indeed there is  a problem that will not be resolved by increasing number of iterations.

After testing I saw that the problem comes from interaction between the h_stab and v_stab, removing the v_stab resolves the problem. To keep the v_stab, you sometimes like in this case need a gap between it and the h_stab. To do so, in the connect_to section, replace :

"dx": -5.0

by

"dx": -5.0,

"dz": -0.1

I don't know why it ran fine on the video.

[Mathiu Berrazueta]

Thank you so much.