Flowsquare: Baby's First CFD Software
Flowsquare is an easy to use 2D CFD program that is free/cheap. It was developed by one guy (Yuki Minamoto) for educational purposes.
What makes it especially accessible is that the boundary layer conditions are just a bitmap. So you can set up your simulations in mspaint. Everything else is configured through a text document. I figured with how much interest there is in miata aero, that some of you may get some use out of this. Its obviously nowhere near as capable as professional CFD software, but those packages are pretty challenging to use. This is a good way to make pretty pictures and maybe learn something along the way. Download and read documentation here: Flowsquare | The free, handy, integrated, Computational Fluid Dynamics software Here is a little sim I ran recently |
2 Attachment(s)
Almost forgot, heres the miata bmp and the config file (grid.txt). For some reason I cant upload a bmp, so its a png. Just open it in paint and save it as a bmp and it should work (it must be called bc.bmp)
https://cimg3.ibsrv.net/gimg/www.mia...5fc33c7b2d.png |
This is really cool, thank you!
I made .bmp files based on yours for hardtop and no hardtop, but when I try to use your grid file I get the attached error. Not sure what is going on there because there is nothing in the grid file called fname1 and there are no differences between your grid file and the default grid file aside from parameter values. I am learning about the parameters in the grid file now. I did not pay enough attention to the aero work when I was on a formula SAE team, I am regretting that now! https://cimg4.ibsrv.net/gimg/www.mia...a7774c8fc2.png |
Thats strange, are you creating a new simulation with a new name? It looks like its looking for a file in the dump folder, which is created in a simulation folder.
Can you screenshot (or cmd dir) the directory everything is in? |
Originally Posted by Full_Tilt_Boogie
(Post 1597298)
Thats strange, are you creating a new simulation with a new name? It looks like its looking for a file in the dump folder, which is created in a simulation folder.
Can you screenshot (or cmd dir) the directory everything is in? Here is the directory before running the program... https://cimg0.ibsrv.net/gimg/www.mia...fe210926a5.png EDIT... So by process of elimination (changing params from defaults to your values until it broke) that the param causing the issue is the 06:sts (start time step). No clue why, because the error it gives doesn't really seem related to that, but that is the one that is breaking things. EDIT 2... I found out why 06:sts is causing an issue and why. The description on the site for sts is "Start or restart time step of the simulation. New simulation always starts from sts=0. You can restart the simulation from the point you output the simulation results in dump folder". So in your grid.txt file, sts is a positive number (not 0), so the program thinks that it is picking up at the sts time on an existing simulation. So I guess the error now makes sense too. I should have noticed this earlier but didn't have time to dig into the documentation. Either way, awesome program and I am going to keep messing with it! |
Oops that was my bad. I last used that grid file to continue a simulation.
Glad you got it working though. Ill be curious to what kind of stuff you make |
Miata with hardtop vs top down...
https://cimg9.ibsrv.net/gimg/www.mia...4186f2a47d.png https://cimg0.ibsrv.net/gimg/www.mia...e4207b6ef3.png Not sure what I have learned so far, but I had fun. lol Am I right in thinking that pressure is the important thing to visualize if I am trying to see the aerodynamic penalty for running with the top down? |
I was lucky enough to get a Canadian company named Creaform to do the CFD for my Catfish. They used the same program that's used by several F1 teams and needed a server farm for the results. That said, it seems like your setup gives much of the general data that you'd need to make aero decisions. Open top is definitely bad for aero. If I remember, it might be as high as 0.48 Cd in top-down form.
https://cimg5.ibsrv.net/gimg/www.mia...6f8d6946f6.png https://cimg6.ibsrv.net/gimg/www.mia...81e18ac504.png https://cimg7.ibsrv.net/gimg/www.mia...9e660354bf.png https://cimg8.ibsrv.net/gimg/www.mia...9cf000f578.png |
Originally Posted by cordycord
(Post 1598727)
I was lucky enough to get a Canadian company named Creaform to do the CFD for my Catfish. They used the same program that's used by several F1 teams and needed a server farm for the results. That said, it seems like your setup gives much of the general data that you'd need to make aero decisions. Open top is definitely bad for aero. If I remember, it might be as high as 0.48 Cd in top-down form.
The flowsquare software is really cool but I don't know to use it well enough yet to do 3D models that would be needed to know the aero impact of hardtop vs soft-top vs top down. I really wish I had paid more attention to the aero work back when I was in school. |
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