Clump Behavior: Alexei's Setup + High Density Contrast

The same setup as before (ehansen09162014), except now the clump density has been increased by a factor of 4 to make the density contrast 2000. This time, I only tested the 3 different Riemann solvers with 2nd order accurate interpolation. Also, the CFL vars have been lowered to 0.5, 0.2, 0.5 for all runs.

Exact HLL HLLC
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Some interesting facts about run times…These all ran on 64 procs on Stampede.

Solver Run Time (mins)
Exact 66.88
HLL 180 (to frame 92.5)
HLLC 68.34


Some Observations

  • HLLC is still very asymmetric
  • Exact has become more asymmetric
  • HLL is now most symmetric but is also most diffusive and for some reason the code is much slower with HLL

So Exact still looks like the best option even though a high density contrast has led to more asymmetry. Is it possible that we are pushing the accuracy limits of the code with such a high density contrast?

I think the next logical step is to put the contrast back down to 500 and put the clump in motion. Then we will know how clump motion affects the simulation independent of the high density contrast.

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