[petsc-users] snes options for rough solution

[Praveen C]

Increasing number of snes iterations, I get convergence.

So it is a problem of initial guess being too far from the solution of the
nonlinear equation.

Solution can be seen here

https://github.com/cpraveen/fenics/blob/master/1d/cosmic_ray/cosmic_ray.ipynb

Green curve is solution after two time steps.

It took about 100 snes iterations in first time step and about 50 in second
time step.

I use exact Jacobian and direct LU solve.

Thanks
praveen
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