The problem of motion by use FreeCAD

Sding · May 2021

I want to simulate the motion of two "Regular Wave Generator(Piston)" at the same time by FreeCAD,

however, it can't run the simulation for the reason:

"*** Exception (JMotion::EventAdd) Text: Missing movement (id=1) inside the object with id=2."

I know it can be solved by changing the "mvdull id" to "1" in Case_DEF_XML, for the initial simulation is:

</objreal>

and change it, it can run but not use FreeCAD :

</objreal>

</objreal>

</motion>

Can you help me to solve it ,just to simulate two Piston by FreeCAD

Thank you sincerely

Alex · June 2021

Perhaps you should work directly with the XML files and the scripts (BAT or SH).

You can download the full package from https://dual.sphysics.org/downloads/

and follow this video: https://youtu.be/_sL1iQUJfs8

Regards

Sding · June 2021

Thank you for your reply, i got the result with XML files.i did the same example months ago by FreeCAD but now can't ,so i wonder it.

by the way, dose DSPH can solve the wave decay problem?

Best Regards

Alex · June 2021

There is no wave decay problem if you use proper values of artificial viscosity (0.01) of density diffusion term (option 2 with 0.1), coefh higher than 1.2 and you propagate the wave for no more than 3 wavelengths of course

Regards

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The problem of motion by use FreeCAD

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