[KVRC] Khamsin Virtual Racecar Challenge 2016

[CAEdevice]

Hi Julien, the single threaded version is running tonight: I will let you know the results tomorrow (but it seems to work, thank you for adding this option!).

The multicore version instead stops at the same point of the previous release.

[etsmc]

@etsmc You may want to use the light version of OCCFD for part of the development. Expect to see some differences (in particular in regards to downforce), but you should be able to have a faster turn-around (and get confirmation that OCCFD is working from start to finish),

Thanks, giving it a go now. the first time it failed but I had not installed the ms-mpi file you linked to so installed that now and running again.

edit:

another update tried the light setting after installing the Microsoft HPC pack and I get an error on simulation 1 after the section "Running parallel with command "(mpiexec.exe location) -n 2 simpleFoam.exe -parallel"
Error occurred with message:
the simulation did not run properly.


any suggestions??

[CAEdevice]

@etsmc You may want to use the light version of OCCFD for part of the development. Expect to see some differences (in particular in regards to downforce), but you should be able to have a faster turn-around (and get confirmation that OCCFD is working from start to finish),

Thanks, giving it a go now. the first time it failed but I had not installed the ms-mpi file you linked to so installed that now and running again.

edit:

another update tried the light setting after installing the Microsoft HPC pack and I get an error on simulation 1 after the section "Running parallel with command "(mpiexec.exe location) -n 2 simpleFoam.exe -parallel"
Error occurred with message:
the simulation did not run properly.


any suggestions??

The parallelization issue is still present. Try to launch "simpleFoam.exe" from the console, it will run a single core solution (or Julien could add a "light" solution not parallelized).

[CAEdevice]

I finally was able to complete simulation with OCCFD (single core).

I received strange results about the inlet/outlet surface areas (opt1):

Code: Select all

Cooling intake, Area: 0.103m2 - Not compliant !!!
Cooling exhaust, Area: 0.076m2 - Not compliant !!!

Why are they not compliant? The rulebook says that there values are ok, am I wrong?

[Alonso Fan]

The parallelization issue is still present. Try to launch "simpleFoam.exe" from the console, it will run a single core solution (or Julien could add a "light" solution not parallelized).

Does parallelisation issue mean that occfd can't run on multiple cores?

[CAEdevice]

Yes, the windows porting seems to have problems with multicore.

[CAEdevice]

I'm ready for the first race: it doesn't matter if there will be no points, I'm going to use the most optimized car I could design.
Here's the new car, with the official colors . I hope it can intimidate the other teams , especially MantiumRAY

[Alonso Fan]

I'm ready for the first race: it doesn't matter if there will be no points, I'm going to use the most optimized car I could design.
Here's the new car, with the official colors . I hope it can intimidate the other teams , especially MantiumRAY

https://dl.dropboxusercontent.com/u/522 ... _light.jpg

Looks cool. Which CAD software did you use?

[CAEdevice]

I'm ready for the first race: it doesn't matter if there will be no points, I'm going to use the most optimized car I could design.
Here's the new car, with the official colors . I hope it can intimidate the other teams , especially MantiumRAY

https://dl.dropboxusercontent.com/u/522 ... _light.jpg

Looks cool. Which CAD software did you use?

90% Solidworks

[WillemG]

Looks like I am a bit out of my depth in the introductory class

So I've loaded up the parts.skp file in SketchUp and have this.
http://imgur.com/Lwga2cb

So I need to make the floor, front wing and rear wing, although I have some SketchUp experience I have absolutely no idea where/how to start. Has anyone got any pointers?

Many Thanks,
Will


--- 20 minutes later....
http://imgur.com/aBbJ8f3

[CAEdevice]

I'm sorry, but I can't see the images!

[julien.decharentenay]

@CAEdevice Nice car and I love the rendering details. Well done.

On my quest to get a parallel setup to work for someone else than me (and giving you some more tools), I have done the following two things:

- OCCFD v1.1 patch 008 - I added a parallel test option to the KVRC Testing - so that you don't have to wait a while to test if the parallel simulation is working. I also added a Light Single Core version. Download link http://www.khamsinvirtualracecarchallen ... .1-008.zip

- i made a small test case to run in parallel. Download it from https://drive.google.com/file/d/0B7FzSB ... sp=sharing and extract it. Open a command prompt and try running in parallel using the command
mpiexec -n 2 simpleFoam.exe -parallel

You can try variations: calling mpiexec with the path, or trying within cygwin and outside of cygwin. For my purpose it is important that it works outside of cygwin. In cygwin, use the command "which" to find where the executable is located (for example which mpiexec) and the command "where" in the windows command prompt.

It would be great if you can feedback what works and doesn't work.

[WillemG]

I'm sorry, but I can't see the images!

The images keep disappearing after ~10 minutes so I've included a link.

[RicME85]

I'm sorry, but I can't see the images!

The images keep disappearing after ~10 minutes so I've included a link.

Are you signed up to Sketchucation? If not go there, sign up and get their Extension Store plugin. From there I recommend Curviloft and Bezier Curve (I think that's what its called) and Mirror. Also worth using the official Sketchup store to get the Stl plugin.

[machin]

Ok... so another problem for you nice people on the forum to help out with....

I am trying to save my body parts out of Solidworks into STL format... however the origin doesn't stay where it is in the Solidworks model....

I've checked the "Do not translate STL data" box, highlighted below, and you can see the origin in solidworks is in the right place:-



The STL export preview still shows the origin in the right place:-



...and yet when I open up the STL file the origin shows up in the volumetric centre of the part!



Any ideas???