[petsc-users] Petsc has generated inconsistent data - Divide by zero!

[Jed Brown]

On Sat, Jul 9, 2011 at 17:57, TAY wee-beng <zonexo at gmail.com> wrote:

> Ok thanks. Btw, is it better to solve my x/y eqns together? How can I do
> that?
>

Sure, interlace the x and y degrees of freedom and assemble the matrix with
x equations in the even row/column numbers and y equations in the odd
row/column numbers.

Note that the equations are not decoupled for some boundary conditions (e.g.
slip on a curved surface or free surface).
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