Question #671364 on Yade changed:
https://answers.launchpad.net/yade/+question/671364
Status: Open => Answered
Jan Stránský proposed the following answer:
Hello,
Instant replay: "Please describe more the experiment (how much is the
aircraft crashed etc.)". First you (and we if you want our help) should
know what is simulated. I know you wrote 18 m/S velocity and penetrate
1/2 meters, but for not at all experienced person it does not tell
much..
> I have To use yade for this project And compare its result with others
taken with others software.
ok, makes some sense. Yade **might** (depending on time, dimensions etc.) be a
good choice for the soil modeling, but currently definitely not for modeling
deformations (especially inelastic) of the aircraft ..
What exactly "its result" should be?
How much time you have for this project? I think it is a critical point. If
years, you can try a lot of things, if weeks or months, I would not be very
optimistic..
Also the computational power you have might be important..
> I would like to see on video the deformations of the aircraft( if something
> break, like The wings And etc.), that S why i would like To have facet facet
> contacts.
> However i don t have To register the deformation , But i would like To see
> that the aircraft Is taking "damage" during the impact
a few points:
- according to Wikipedia (I don't know STL almost at all): "STL files describe
only the surface geometry of a three-dimensional object". This would mean, that
even you have facets, they are useless for aircraft modeling even if there
would be fatet-facet contact (because it is "surface of surface"). Maybe you
could post the stl file on the internet such that we can view it?
- I understand the idea to use facets for modeling the aircraft as a shell.
However, you would need some fancy cohesive inelastic facet-facet contact model
able to capture shell-like behavior etc... quite a lot of work, implementing,
testing..
- all in all, this aircraft modeling you want is not suitable for DEM and Yade..
- To realistically model the crash is complicated even for specialized
softwares. I.e., to "see" deformations and damage is no problem, but if you
come to velocity, energies...
Maybe you could model the airplane also by spheres, but that would need
a lot of preprocessing work..
> Or, if Is The same, clumping The structure. What do you suggest) .
clumping the facets would make it rigid body
My suggestion: I would go step by step. First make the aircraft rigid and
simulate the test this much simplified. It might happen that the simulation
would take too much time or the soil would react in completely different way
you want or........
After you check the simulation is feasible and gives somehow acceptable
results, you can make it more complicated.
cheers
Jan
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