[mesa-users] Change Mesh Resolution Dynamically?

[Spencer C Wallace]

Thanks! I didn't realize I modify the inlist controls through the star
pointer. Is it safe to change the mesh tolerance parameters from
'other_mixing', or do you suggest writing a routine through 'other_mesh' to
do it?

Spencer Wallace

On Mon, Sep 8, 2014 at 5:45 PM, Bill Paxton <paxton at kitp.ucsb.edu> wrote:

> Hi,
>
> There are controls that let you increase the resolution adjacent to a
> convection zone boundary.
> You specify the type of convection zone (non-burn, h-burn, he-burn, other),
> the boundary (upper or lower),
> and the direction relative to the boundary (above or below).
> You give the extent of the increased resolution in terms of the local
> pressure scale height.
>
> e.g.    for below lower nonburn convective boundary
>       xtra_coef_b_l_nb_czb = 1   ! Value < 1 gives increased resolution.
>       xtra_dist_b_l_nb_czb = 0.2 ! distance in units of pressure scale
> height
>
> You should of course read through the entire list of controls for the mesh
> resolution in star/defaults/controls.defaults.
>
> Good luck,
> Bill
>
>
>
> On Sep 8, 2014, at 4:52 PM, Spencer C Wallace wrote:
>
> > Hello,
> >
> > I have added some code to the 'other_mixing' routine that mixes material
> at the convective boundary according to a 1D entrainment law. At each time
> step, I calculate some deltaM according to how much material should be
> entrained and crank up the diffusion coefficient in all zones that fall
> within deltaM of the convective boundary.
> >
> > In the types of models I am working with, this deltaM often only covers
> one or two extra zones. This introduces some noise, as the difference
> between mixing one and two extra zones can be quite dramatic.
> >
> > Now the most obvious solution is to increase the mesh resolution, which
> does fix the problem. I understand that I can do this by changing the
> inlist parameters, but that requires some trial and error, as there no way
> to know how many zones the entrainment will cover at each time step until
> you actually run the model.
> >
> > I was wondering how I could make the mesh resolution scale with the
> entrainment strength. My 'other_mixing' routine calculates a deltaM at each
> time step, which is then translated into some number of zones, deltaN. If
> deltaN is too small, is there some way I can temporarily bump up the mesh
> resolution?
> >
> > I saw that there is an 'other_mesh' hook that I can add code to, but I
> didn't see any variables in 'star_data.inc' that looked like they would
> allow me to tweak the mesh resolution. Any suggestions?
> >
> > Spencer Wallace
> >
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