[mesa-users] Fwd: problem with mu-gradient region 6 Msun

[Bill Paxton]

FYI: Here's another way to attack the problem of smoothing composition.


Begin forwarded message:

> From: Bill Paxton <paxton at kitp.ucsb.edu>
> Date: July 19, 2013 10:13:21 AM PDT
> To: G J Savonije <G.J.Savonije at contact.uva.nl>
> Subject: Re: problem with mu-gradient region 6 Msun
> 
> 
> On Jul 18, 2013, at 10:10 PM, G J Savonije wrote:
> 
>> My idea is that only the compostion should be smoothed from cell to cell by introducing an artificial diffusion-term.
> 
> ahh!  then let's try this -- it sets a floor for the mixing diffusion coeff's (cm^2/sec).
> 
>          set_min_D_mix = .true.
>          min_D_mix = 1d6 ! D_mix will be at least this large
> 
> You'll need to try different values to see what works.  
> For comparison, in convective regions D_mix is > 10^15.
> 
> Here's the D mix profile with min_D_mix = 1d6 for your test case.
> The regions where log D_mix = 6 would be unmixed normally.
> 
> 
> Cheers,
> Bill
> 

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