
<p>WHAT THIS EXAMPLE DEMONSTRATES:</p>
<ul>
  <li>Changing the default ODE integrator</li>
  <li>Handling unstructured grids</li>
  <li>Registering your own interchangeable physics and algorithm modules</li>
</ul>

<p>FURTHER DETAILS:</p>
<ul>
  <li><a href="https://www.mcs.anl.gov/petsc/petsc-current/src/ts/tutorials/ex11.c.html">Mathematical description of the problem</a></li>
  <li><a href="https://www.mcs.anl.gov/petsc/petsc-current/src/ts/tutorials/ex11.c.html#line1403">main program source code</a></l