non-convergence with full chianti enabled
testing with all of chianti turned on reveals only one abort, the sim blr_n09_p22_Z20. the symptoms are mysterious
getting to zone 16, where the first convergence failure is announced, takes several hours. the code is clearly thrashing.
typical ionization at this point is roughly Fe 21 +/-2
there is a thermal front in this model, so I checked whether too large a dr near that front could be a cause. The save dr output was not produced. there were only the first dr choices - the zone dr was never reported. so, "save dr" does not work in this test.
the convergence failure is not due to a thermal front - constant temperature also fails