[FLASH-USERS] Maclaurin test problem

[Carlo Graziani]

Hi Philip.

The Maclaurin unit test setup is only intended to test the accuracy of the
potential calculation.  It does not, as you observe, evolve the fluid,
because that is not required for this purpose.

The full Maclaurin spheroid solution corresponds to a uniformly-rotating,
uniform-density (and therefore incompressible) fluid.  Setting this up as a
dynamical problem with a gasdynamic code such as FLASH would not be easy,
and would probably require a degree of approximation such as to make the
comparison with the analytical solution moot.

Regards,

Carlo


On 07/17/2013 02:50 PM, Philip Chang wrote:
>
> Hello FLASH users,
>
> I'm trying to set up the Maclaurin test problem and it doesn't appear to work.  In particular, it appears that it is failing on calling the equation of state, which is strange because it is just an adiabatic gamma-law EOS.   On the other hand, the unitTest/Multipole seems to work just fine.  Because they are so similar, it is confusing why this is happening, but it appears that the difference is that the evolution step in the unitTest is empty, i.e., no hydro step, while the Maclaurin uses the hydro step.   This suggests to me that the included Maclaurin test problem no longer works, i.e., these Maclaurin test problem does not evolve.  Is this correct?
>
> Cheers,
> Phil
>


-- 
Carlo Graziani                                 (773) 702-7973 (Voice)
University of Chicago Flash Center             (773) 702-6645 (FAX)
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