[mesa-users] accretion

[David Arnett]

Historically we have used accretion as a way to change mass slowly, often
without worrying about the entropy of the accreted matter or more rapid
time dependence. That is actually a complex multidimensional
radiation-hydrodynamics problem itself, as Dean knows perhaps too well ;-)

I have a question: are the short time steps due to accuracy constraints or
causality constraints? If the former, we have to integrate through them (or
change the algorithm). Are they due to instability (physical or numerical)?
If the latter, we also can change the algorithm. I am curious about what
MESA is trying to do here. Is it clumping?  Is it numerical inconsistency?
Something else?

-- 
David Arnett
Regents Professor
Steward Observatory
University of Arizona

Facts are stubborn, but statistics are more pliable.  Mark Twain
Facts do not cease to exist because they are ignored.  Aldous Huxley
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