[mesa-users] Mass Transfer + Rotation Problems

[Pablo Marchant]

Just checked on this, and It's not the same problem I was facing before,
though just as Bill I only find that the simulation goes to minuscule
timesteps instead of stopping.

Before, I had that the binary rlo implementation, as it evolved first the
donor, and then the accretor in as much steps it took up to just the age of
the donor, could cause the donor to make very tiny timesteps when it got to
close to the donor age while catching up. My personal version of binary_rlo
fixes this, yet with these inlists my runs also go to tiny timesteps, using
either implicit or explicit rlo.

This however seems to be a problem related to accretion onto a rotating
model. When running this example the accretor starts failing on evolve as
the mass transfer becomes stronger and ends up with messy models and tiny
timesteps.

Will try to see if I can get something similar experimenting with single
rotating stars to check if this is effectively not a problem with the rlo
routines.

Cheers!


On Wed, Feb 27, 2013 at 11:47 PM, Bill Paxton <paxton at kitp.ucsb.edu> wrote:

> Hi Pablo,
>
> Could you please take a look at this binary_rlo case (it is directly based
> on the test_suite).
> Cole reported a "stop" debug error at the start of mass transfer.
> But when I run with his inlists, it drops to very small timesteps at the
> start of transfer
> (log(dt/yr) ~ -8.5).  This sounds similar to things you've been working on.
>
> Thanks,
> Bill
>
>
>
>
>
>
>
> On Feb 27, 2013, at 12:13 PM, Cole Adams wrote:
>
> Hi,
>
> Here is a .tar with the set of inlists used (borrowing heavily from the
> example given in the test_suite)
>
> Cole
>
>
> On Tue, Feb 26, 2013 at 2:15 PM, Bill Paxton <paxton at kitp.ucsb.edu> wrote:
>
>> Hi Cole,
>>
>> Please send me the necessary info to reproduce the problem: inlist and
>> starting model if any.
>>
>> Thanks,
>> Bill
>>
>>
>>
>>
>>
>> On Feb 26, 2013, at 11:19 AM, Cole Adams wrote:
>>
>> > Hello,
>> >
>> > I've been trying to run rotational binary models, but when the system
>> begins mass transfer mesa exits with the debug error "set1_omega". I found
>> the function in question in the adjust_mass.f file, and was able to verify
>> that the reason is because dm_sum is bigger than new_point_dmbar, but I
>> don't know what I should be doing differently to get the model to run
>> properly.
>> >
>> > Cole
>> >
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>
>
>
>


-- 
Pablo Marchant Campos
M.Sc on Astrophysics, Universidad Católica de Chile
PhD student, Argelander-Institut für Astronomie
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