Hi Daniel,
You do have control over the most important parameters that control the moving
patch. See demo_VEH_GranularTerrain_MovingPatch and the parameters passed to
EnableMovingPatch.
A few comments:
* The one parameter that is not exposed to the public API is the height of
the lowest layer of moved particles. This is because that is implemented as a
factor of the particle radius and its value is constrained by some other
considerations (if you really want to play with that, you can change its value
from the default 3 to something else in GranularTerrain.cpp at line 64).
However, the same effect of increasing this height can be obtained (more
robustly) by increasing the downward velocity with which moved particles are
initialized (last argument of EnableMovingPatch).
* Through EnableMovingPatch you can therefore change:
* “buffer_dist” – this is the (forward) distance from the moving body to
the end of the current granular terrain patch at which a relocation of
particles is triggered. The shorter this value, the longer the body will go
before new particles are created in front of it (and the shorter the time those
particles will have to settle before the body gets above the relocated
particles).
* “shift_dist” – this is the dimension (in the forward direction) of the
relocated block of particles. The larger this value, the more particles are
moved from “back” to “front”
* “init_vel” – this is the initial velocity given to all relocated
particles when they are moved to the front. Usually, you would set this as a
downward velocity to help the relocated granular material relocate.
--Radu
From: [email protected] <[email protected]> On Behalf
Of Daniel Zuo
Sent: Thursday, November 7, 2024 2:45 PM
To: ProjectChrono <[email protected]>
Subject: [chrono] How to adjust the parameter of "moving patch"
Hi,
I'm currently running the "multicore tire testrig" demo with granular terrain
to study the tire-soil contact scenario, and I'm having problems trying to
modify the 'moving patch' parameters (for example, moving patch generating
height, moving patch length) to see how it affects the simulation results. I
tried to modify the code in
chrono/src/chrono_vehicle/terrain/GranularTerrain.cpp, but it doesn't seem to
work. What should I do?
Thanks！
Regards
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