Joe7218 wrote: ↑29 Apr 2020, 15:30
yinlad wrote: ↑29 Apr 2020, 09:35
I'm so very confused at the moment. I also can't get the rear of the car to make any downforce. My floor has also halved how much downforce it's making, even though the flow through and out of it looks the same as some earlier runs I did where it was producing around -1.00.
Cooling also gets worse over 2500 iterations compared to 1500, though I still don't get the correct streamlines for cooling. Has always been a problem for me for some reason.
Basically everything is going wrong and nothing I do seems to fix it!
The cooling streamlines don't seem to work for me either I don't think (set 5 of the streamlines is just blank, nothing shows up)
My rear wing makes about -0.7 right now, however I noticed my wing supports caused the flow to detach In the middle quarter of my wing or so. I've changed the supports but am yet to run a sim of it, will update once I do
This post worries me. I often post the following link and will do once more. Not paying attention to this killed Variante's championship last year:
https://mantiumchallenge.com/porous-media-openfoam/
Every node in the stl is the seed for a streamline. This is a bit unfortunate as it causes a bit too many streamlines on a good measurement surface. But only getting a handful of streamlines tells me that your surface is a bit too rough.
Today I will be exclusively be working on MFlow and MVRC to address some of the issues.
I have done some investigations on the cars this year to see why you generate so low downforce numbers. This is in part because of ride height and rake limitations together with the somewhat short car, we are running. I was close to fix the ride height and rake issue but then decided to just start the season for obvious reasons. Allowing more flexible rake, would need an automatic transformation of the rear suspension. But like, I said, I have been working on this and it will be available soon. It will probably have to wait for the new rule book though.
etsmc wrote: ↑01 May 2020, 09:31
regarding the num_cfd_results_mvrc file, has anyone got a process for comparing runs like grabbing the data from this file and throwing it into a spreadsheet? tried importing in to excel but there is no easy way as the file is not delimited in any way..
Having a useful separator in the numeric results is a good idea. I will try to get that done today. But I could just as well post some Python code on how to extract the numbers out of what we have right now into a Pandas dataframe, in case you or someone else is interested.
. My script extracted the strings inbetween ": " and ", " and would then look for names like "bargeboard" to find the appropriate cell to paste the data into. Another reason I don't use it anymore is, I tend to divide the parts as they get more detailed. So it becomes quite a hassle to keep track all the different parts, and it makes comparisons meaningless over time. But that may be stupid of me to begin with 
. 
I like to see trends over every iteration so it's a big spreadsheet with main results on sheet1, breakdown of parts on sheet2, deltas between parts on sheet3, and a big table with component IDs and what's changing with each case. i.e. baseline parts are v01a, a small incidence change or something would be v01b, a big geometry change is v02a. There are 2 "notes" boxes on sheet1 of what I want to see change in the case and a small report of what did change and what to look into moving on, kinda like your "problem" and "change" boxes. 