Underworld Magma Solitary Waves Benchmark - Equations

Porosity is advecting in response to the compaction pressure:

Fluid is being driven by gravity through a porous media according to a Darcy equation, in which permeability is a power law of the porosity:

See Magma Overview page for references.

-- Wendy Mason - 20 October 2010
-- Dave Lee - 20 October 2010