[mesa-users] instability issue

[zoe ansari]

Hi MESA users,

We are going to study the behaviour of an external field during the
evolution of star, therefore a second order equation of time and radius
must be solved inside mesa code. The problem is that for the instability to
be refused, " dt "  must be about 10^(-11) seconds and the timesteps
between mesa profiles are of order 10^(+15) seconds. Is it possible to
study such a behaviour and apply the equation in mesa?
Another question is about mesa mesh adjustment and the CFL number. How is
the CFL number defined in mesa and which quantities does it relate, (dt,dr)
or (dt,dm) ?

Thank you in advance

Best regards

Zoe
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