Actually there's no "perfect" model for turbulence in the sense of computational efficiency. Grad or SuperBurnett models based on Navier-Stokes are good but computational expensive. LBM can be used also for turbulence but instead of LBGK which is a linear approach best suited for steady state, the collision operator should consider extra terms and then it becomes non linear and suitable for handling large Re and moderate Kn numbers.
Could you share much more information, such as explaining some of your coding project. I am very interested with this kind of simulation and want to have a try. Thanks!
I'm curious, because I thought LB was notoriously bad for turbulence (because the grid would have to be ridiculously fine in order to get accurate eddies)?
Actually there's no "perfect" model for turbulence in the sense of computational efficiency. Grad or SuperBurnett models based on Navier-Stokes are good but computational expensive. LBM can be used also for turbulence but instead of LBGK which is a linear approach best suited for steady state, the collision operator should consider extra terms and then it becomes non linear and suitable for handling large Re and moderate Kn numbers.
googlenauta 9 months ago
Great...what was your grid size??
mak541 1 year ago
@mak541 I'm no sure now. I think it was 512x256.
ZnahNah 1 year ago
Could you share much more information, such as explaining some of your coding project. I am very interested with this kind of simulation and want to have a try. Thanks!
gwtw1276 3 years ago
What software did you use to make this animation? It looks much better than those made using TECPLOT.
rapters1983 3 years ago
My own code.
So I used MSVC, ImageMagick library for saving images and VirtualDub to convert them into .avi
ZnahNah 3 years ago
Cool! What visualization method did you use? I have misjudged it to be an experimental result.
rapters1983 3 years ago
Brightness of pixel shows local speed. Also I add a lot of small green particles, which were blurred by youtube's codec.
ZnahNah 3 years ago
Very, very cool. Is this from your PhD or something?
ErlendDavidson 4 years ago
No, it is just a part of my course project.
ZnahNah 4 years ago
I'm curious, because I thought LB was notoriously bad for turbulence (because the grid would have to be ridiculously fine in order to get accurate eddies)?
ErlendDavidson 4 years ago
nice vid, which boundary condition has been used at the obstacle and which code is that?
ytdank 4 years ago