[aspect-devel] questions regarding accuracy of no-heat flux boundary condition and help needed for the right entropy viscosity parameters
heister at clemson.edu
Sun Jul 10 06:06:13 PDT 2016
I don't have answer to all of your questions, sorry. But:
> The no heat flux boundary conditions are assigned at left and right walls of
> a rectangular box. My first question is that the no heat flux boundary
> condition seems not preserved for both FEM and DG methods after long time
> computation, see attached pdf "T_no_hear_flux_plot.pdf".
What is the size of the heat flux through the left/right and how does
it compare to the top/bottom heat flux? If this is non-zero but
several orders of magnitude smaller, then that is as good as it can
get. If not, then I don't know.
> As shown in the figure 'timeE10.png', the final solutions of FEM(right) and
> DG(left) are very different.
It looks like a problem with a bifurcation, so there could be more
than one valid solution. But I agree that they should probably look
more similar than they currently do.
> Since the test example
> uses constant viscosity, the harmonic average will not help here.
Are you sure? The composition influences the density, which is also
averaged if you turn it on.
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