Turns out I was running my BLOB tests incorrectly by not telling gadget that the box size was not a cube. The periodic box was supposed to be x,y,z=[2000,2000,6000] but was simply registering as [2000,2000,2000]. Initially I didn’t think this would pose a problem since it was a periodic box, but I forgot to take into account the shockwaves propagating back into the initial blob and causing some unwanted disturbances. Anyway, by switching on three parameters in the makefile:
-DLONG_X=1.
-DLONG_Y=1.
-DLONG_Z=3.
I was able to easily fix this problem so the box was properly
structured. After a day’s worth of testing I ended up with some nice
results:
where we see that both DISPH cases do much better than the vanilla
SPH case.
UPDATE(7/26/13)! Movie of a high-res blob test zoomed in on the blob:
In other news I made a longer KH instability movie, this time in
1080p!
these movies were created with ffmpeg, the settings to create a
slightly smaller and ‘more compatible’ youtube file are as follows:
ffmpeg -r 12 -i splash_%04d.png -c:v libx264 -crf 1 -pix_fmt
yuv420p -r 30 output.mp4
where the -crf is the constant rate
factor; a value of
0 is no compression where a value of 50 is maximum compression. The
-pix_fmt command has something to do with downsampling. I got all of
this from a forum
post.
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