kes-type PDE on a structured grid</h2>

<p>WHAT THIS EXAMPLE DEMONSTRATES:</p>
<ul>
  <li>Handling a 3d structured grid</li>
  <li>Controlling linear solver options</li>
  <li>Selecting composible preconditioners</li>
  <li>Solving a Stokes problem</li>
  <li>Adding your own problem specific visualization</li>
</ul>

<p>FURTHER DETAILS:</p>
<ul>
  <li><a href="https://www.mcs.anl.gov/petsc/petsc-current/src/ksp/ksp/tutorials/ex42.c.html">Mathematical description of the problem</a></li>
  <li><a href="https: