BE Update

​http://www.pas.rochester.edu/~erica/vvec.html

I am running into some odd behavior with my bonner ebert simulations. The simulations run smoothly for about 3 crossing times. During this time there is a density increase of about 500x and the mass is squeezed into a tiny region at the grid center. I have noticed that the mass here is unevenly distributed (I.e., more so along one dimension than the others). Then the entire clump expands, fast, but in a squashed geometry. It seems like as the simulation progresses, however, the clump tends again toward a spherical geometry.

I am curious why this squashing along one dimension is happening. In earlier simulations, I saw distortion caused by pressure waves running off the sides of the cube and interacting with the center sphere. There, however, the geometry remained symmetric, as it should… I am dubious as to why I am seeing this asymmetry appear.. Perhaps the volume into which the material is collapsing is smaller than the grid can resolve, causing some wonky numerical behavior? I noticed a diamond shape occuring at the center of the sphere in the slices of density contours, leading me to believe this could be a matter of resolution..But alas, why would one of the squares in the diamond contain more mass than the others?? Why would this mass not be symmetrically distributed?

ALSO — I noticed that running AMR with the same effective resolution took ~5x longer…

I am running a 63x63x63 job now, with 3 levels AMR..

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