Hello everyone!
I’m currently working on the simulation and calculation of lunar
rover terramechanics. So far, I’ve successfully configured
Project Chrono for C++ and PyChrono for Python through Windows.
However, I’m not as familiar with C++ as I am with Python, so I’m
asking everyone: are the current features of PyChrono
comprehensive enough to implement the calculation process for
FEM-based wheels and SPH-based soil? If yes, what are the
installation commands for the latest version of PyChrono? Since
I’ve already installed PyChrono 9.0.1, it seems that it doesn’t
support the pyChrono::FSI module yet.
All the best！
Ding
屏幕截图 2025-12-19 152954.png屏幕截图 2025-12-19 153029.png
在2025年9月28日星期日 UTC+8 23:50:23<Radu Serban> 写道：
That’s fantastic, Rebeca.
We’ll make a note about the number of threads issue (in case
other users run into similar issues). The truth is we have
not used older GPUs in such a long time, we take for granted
certain capabilities.
If you can get access to a cluster with newer GPUs, you will
see a dramatic increase in computational performance.
Best,
Radu
*From:*[email protected]
<[email protected]> *On Behalf Of *Rebeca Guimarães
*Sent:* Saturday, September 27, 2025 4:34 PM
*To:* ProjectChrono <[email protected]>
*Subject:* Re: [chrono] FSI won't work
Hey there, Radu!
I'm thrilled to tell you I was able to run the FSI module in
my computer!
It turned out FsiForceWCSPH was requesting 1024 threads and
my GPU was unable to give that. I then adapted it and changed
to fewer threads and it worked out.
I'm still working on the visualization, since I only had
Irrlicht, so I'll now install VSG.
It's just a temporary solution, since I'm requesting approval
to use my uni's laboratories' computers, but up until then,
I'm able to continue my VIPER single wheel simulations. Once
I have access to the labs, I hope to be able to run complete
rover simulations.
Em sexta-feira, 26 de setembro de 2025 às 15:28:46 UTC-3,
Radu Serban escreveu:
Hi Rebeca,
So, you do have a pretty old GPU. Anything before 7.5 is
now considered legacy. In fact, 7.5 is also marked for
obsoletion.
I’m afraid you’ll need to get access to newer hardware.
--Radu
*From:*Rebeca Guimarães <[email protected]>
*Sent:* Friday, September 26, 2025 1:48 PM
*To:* Radu Serban <[email protected]>
*Subject:* Mensagem particular referente a: [chrono] FSI
won't work
Hey there, Radu!
My last try had indeed been with CUDA 12.3 yet again,
since my last try with 13.0 resulted on the exe simply
closing right from the start.
Searching for CUDA
CUDA compiler: D:/Program Files/NVIDIA GPU Computing
Toolkit/CUDA/v12.3/bin/nvcc.exe
CUDA toolkit version: 12.3.52
CUDA toolkit root dir: D:/Program Files/NVIDIA GPU
Computing Toolkit/CUDA/v12.3
CUDA archs (from cache): 60
CUDA found and enabled.
Searching for Thrust
Thrust version: 2.2.0
Thrust include dir: D:/Program Files/NVIDIA GPU Computing
Toolkit/CUDA/v12.3/include
I was able to surpass the atomicAdd error by defining
sm_60 instead of all_major as the arch, since I have a
GPU with compute capability of 6.1. On the other hand,
now I'm getting a new error of too many resources
requested for launch when I compile and run the single
wheel FSI demo. But that only happens when I run my own
compiled demo, the pre compiled demo available on the
Chrono website runs normally.
I don't know if there are any differences between the
source code of the pre compiled demo and latest one
available on git that would explain the higher demand for
GPU. Or if it's still an error due to CUDA issues.
If you could shed any light on the matter, it would help
a lot!
Thanks,
Rebeca
Em sexta-feira, 26 de setembro de 2025 às 02:53:51 UTC-3,
Radu Serban escreveu:
I would suggest holding off on using the PyChrono
conda package that Dan mentioned. That is not based
on the current Chrono code (and was set up as a
temporary solution for some tutorials we recently ran
at UW-Madison). Updated official PyChrono conda
packages with Chrono::FSI support will come soon.
--Radu
*From:*[email protected]
<[email protected]> *On Behalf Of *Rebeca
Guimarães
*Sent:* Thursday, September 25, 2025 11:30 PM
*To:* ProjectChrono <[email protected]>
*Subject:* Re: [chrono] FSI won't work
Hello, everyone!
Thank you for the suggestion, Dan! I will definetely
try out PyChrono. I need to present a proof of
concept to my undergrad thesis advisor in the next
weeks so I had decided to go with C++ since I
struggled a bit with Anaconda. But I'll try again :)
Radu, I've been using the latest version, I
downloaded it from the git. I'm able to compile and
build Chrono and run Vehicle module projects.
The FSI single wheel demo that comes in the pre
compiled pack works just fine in my computer. But
whenever I try to compile a new project, even the
demo cpp itself, it will run and then simply close
the prompt before the visual interface ever starts.
This has been happening with CUDA 12.3, CUDA 12.9,
CUDA 13.0.
What baffles me is the fact I'm able to run the pre
compiled exe, so it doesn't seem to be a hardware
incompatibility. I really have no idea what's going on :(
Have any of you ever faced a similar problem, where
the prompt closes right at the FSI Initialize() line?
Rebeca
Em terça-feira, 23 de setembro de 2025 às 04:46:32
UTC-3, Radu Serban escreveu:
Hi Rebeca,
Could you please clarify what Chrono version you
are using? Older releases will obviously not work
with new CUDA releases.
The current Chrono code in the main branch of the
repository should work fine with any new CUDA
12.* versions (e.g. 12.8 or 12.9), as well as
CUDA 13.0 (although I only tested the latter on
Linux). Any of these CUDA versions will work
fine with the latest VS versions.
Please make sure that:
* you use the latest Chrono code from the
development branch (‘main’).
* Update your copy of Visual Studio to the
latest version.
* You can test with CUDA 13.0.1. If that
doesn’t work, please let me know. But if you
can install a different version of CUDA, I
suggest you use 12.9 which is what I
currently use on my Windows machine.
--Radu
*From:*[email protected]
<[email protected]> *On Behalf Of
*Rebeca Guimarães
*Sent:* Thursday, September 18, 2025 10:45 PM
*To:* ProjectChrono <[email protected]>
*Subject:* [chrono] FSI won't work
Good afternoon!
I've donwloaded and compiled Chrono and been able
to run many projects. Since I'm running
terramechanics analysis, I am now trying to run
FSI SPH.
I was able to code, configure and geenrate, but
when I run the exe, it will halt at the
Initialize and close the cmd.
I think I've narrowed the issue down to CUDA. I'm
using version 13.0.1. I read at the website I
need to use 12.3, but my MSVC says it expects
version 12.4 or newer.
Can someone help me how to downgrade my MSVC so
it will accept 12.3?
Thanks!
D:\Program Files\Microsoft Visual
Studio\2022\Community\VC\Tools\MSVC\14.44.35207\include\yvals_core.h(902):
error : static assertion failed with "error
STL1002: Unexpected compiler
version, expected CUDA 12.4 or newer."
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