[MVRC] Mantium Virtual Racecar Challenge 2016

[etsmc]

another question is with mantiumFlow if there a timeframe for when we might see the additional post processing? such as the generated HTML page and pictures?

[CAEdevice]

I have made a test using the "mid surface" (triangles max size 8mm, h/w max ratio = 2):

Code: Select all

faceSource mSurf_cooling_mid output:
    areaNormalIntegrate(sampledSurface) for U = (-1.41981 0 0)

faceSource mSurf_cooling_inlet output:
    areaNormalIntegrate(sampledSurface) for U = (1.36959 0 0)

faceSource mSurf_cooling_outlet output:
    areaNormalIntegrate(sampledSurface) for U = (-1.45137 0 0)

In my opinion we should switch to the "mid surface" measurement

[RicME85]

Wich surface (inlet/outlet) is used to measure the cooling flow (the values are a bit different sometimes)? I have chosen safe settings for the first two races (3.1-3.2 m^3/s), but the competition is getting harder and I have to refine the car.

I hope this picture explains how the stl triangulation affects the results measured by you guys:
http://mantiumchallenge.com/wp-content/ ... g_flow.png
I always made the mid surface myself using a uniform 10mm mesh.
If you need to know more you can find it here:
http://mantiumchallenge.com/measuring-p ... edia-flow/

This will be a problem for me once I have wflow working because I use Sketchup. Sketchup likes to choose its own way of deciding how planar surfaces are constructed internally. I hope Rich has a clever workaround

I'm going to investigate but off the top of my head the best solution would probably to have to draw horizontal and vertical lines at 10mm intervals and use the triangulate faces plugin. Time consuming but worth the extra accuracy.

Btw, Variante uses SU. That's his car in the image which is why the inlet and outlet is poorly meshed. The middle mesh I assume was done by LDVH for getting the results.

[CAEdevice]

You should switch to FreeCAD (or to a student edition of SolidWorks/Inventor/Creo or to the Personal Edition of CoCreate). It requires an initial effort, but it will give you many advantages, not only in MVRC, but in your future career (there many students among you). SketchUp is just a toy... follow the advice of an old engineer

[RicME85]

This Sketchup bashing from you is becoming old Matteo.
I have tried to switch to various other products but cannot get my brain around them. I struggle with being able to sit for a period of time learning due to pain but moreso painkillers dumbing me down.
Alonso Fan has barely had time to get WFlow working, how is he going to have the time to change the program he uses?
Sketchup works perfectly fine for Variante. It works fine for me, there is just a few quirks you have to work around and 90% of the time it just takes going to Sketchucation and finding a plugin to do the job.

[Alonso Fan]

I will have to check out that plugin you mention, once I get wflow working, that is

[CAEdevice]

This Sketchup bashing from you is becoming old Matteo.
I have tried to switch to various other products but cannot get my brain around them. I struggle with being able to sit for a period of time learning due to pain but moreso painkillers dumbing me down.
Alonso Fan has barely had time to get WFlow working, how is he going to have the time to change the program he uses?
Sketchup works perfectly fine for Variante. It works fine for me, there is just a few quirks you have to work around and 90% of the time it just takes going to Sketchucation and finding a plugin to do the job.

Hi RicME85, I am sorry about your health problems

Waiting for the next race (and without the hardware to develop my car) I try to pass the time talking about CAD. I am not interested in bashing SketchUp (I use it and it works perfectly with some applications), but I shared my experience (I hope it could help). I was talking especially to students, that will be asked which CAD they know when they will apply for a job in a couple of years. I am not sure that investing 2 or 3 weeks learning a serious CAD (including FreeCAD) would be wasted time.

How many seconds do you need to enlarge the cooling inlets? With SWX about 15 seconds (5 seconds to launch the software), with FreeCAD (that is not very good about associativity) about 30 seconds... Also consider that my preferred CAD is Creo (aka ProE) but I noticed that for the MVRC purposes, SWX is faster.

About Variante: he is such a capable aerodynamicist that the CAD tool takes second place (Adrian Newey is not using any CAD system or maybe he uses SktechUp, but I am not as good as Adrian Newey or Variante)

[pierlu99]

Hi guys, I'm trying to make the first analysis in the CFD of the car, but when I click start simulation, I get this error, how can I do?

[TalnoRacing]

Hi guys, I'm trying to make the first analysis in the CFD of the car, but when I click start simulation, I get this error, how can I do?
https://s10.postimg.org/idvq9f2ix/348.png

I had the same issue and resolved it as follows. Before starting the GUI, make sure you load OpenFOAM through the Docker application. Do this as follows:

1. Open Docker application and go the directory where OpenFOAM is installed (mine is in the location c:/program files (x86)/ESI/OpenFOAM/1606/Windows/Scripts).
2. Run the command "docker load -i of_v1606plus_centos66.tar" (enter the command with the "" signs). Your PC will hang for a few seconds and then show the command line again.
3. Open the GUI and follow the readme file to load and start a case.

Before starting Docker make sure your virtual machine is "OFF" or "not running" (sorry I cannot remember the exact term now). You will have to open the VM application normally and as an Administrator to check this.

[pierlu99]

Thanks very much TalnoRacing, later I will try if this work.

[HP-Racing]

I would also recommend updating to the newest version of the GUI. But that isn't linked to the problem you are having.

Edit: Also your car is probably in mm, because it doesn't fit onto the grid in the 3d-previewer properly.

[LVDH]

another question is with mantiumFlow if there a timeframe for when we might see the additional post processing? such as the generated HTML page and pictures?

Currently, no. My idea of using the direct image export from OF+ does not seem to work unfortunately. My current "working" solution is not perfect and only works on Linux which does not help you guys very much. So until I can supply you with a fully perfectly working solution could take some 4 weeks. In the meantime my online solution is hopefully available. Then you will be able to just upload your case to my new platform and you receive everything including the report. But as this is a somewhat complicated project, delays are possible.

In the latest release of MWFlow I supplied you guys with a lot of VTK data gets exported into a "surfaces" folder in the postProcessing folder. You can very quickly load it into Paraview. This should speed up your manual post-processing quite a bit.

Today I came back from the OF conference. There is a certain chance that I will get us a new sponsor and maybe a really cool technical highlight from my university.

[CAEdevice]

Today I came back from the OF conference. There is a certain chance that I will get us a new sponsor and maybe a really cool technical highlight from my university.

Thanks for the good news, you are doing an excellent job.

It would be nice to involve universities with their own teams, as it happens with formula student (I don't know if it is the right name, when I was a student we only had a team to design a steam turbine).

I have found (from next monday) a second PC to substitute mine (it is not available beacuse I need it for some very heavy FEM simulations): i5 4440 + 16gb RAM, not too bad. Meanwhile I am using the "Machin" method.

[RicME85]

Machin method?

Good news on the networking at the conference Andre

[CAEdevice]

Machin method?

= No CFD (there is a dedicated thread somewhere)