[petsc-users] implicit TS solver for flux calculation

[Jed Brown]

Feng  Shi <fshi at fit.edu> writes:

> Dear all,
>
> I'm learning how to use implicit TS solvers to calculate the flux. The example code is http://www.mcs.anl.gov/petsc/petsc-current/src/ts/examples/tutorials/ex10.c.html
> I'm dying in understanding Lines 232-255. Is there anyone who knows how to work this out?

It's chain rule, differentiating the fluxes with respect to the states
in each cell.
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