DiffusionPhysicsBase

This is a base class for the derived Physics actions setting up objects to solve the diffusion equation with a particular discretization.

The diffusion equation solved is:

var element = document.getElementById("moose-equation-effd33d3-e189-4e3c-bdf5-20f415f06236");katex.render("\\dfrac{\\partial u}{\\partial t} - \\nabla \\cdot D \\nabla u(\\vec{x}) - f(\\vec{x}) = 0", element, {displayMode:true,throwOnError:false});

with Dirichlet boundary conditions:

var element = document.getElementById("moose-equation-59fe4288-ac3c-48e4-993d-15ac9da5f954");katex.render("u(\\vec{x}) = g", element, {displayMode:true,throwOnError:false});

and / or Neumann boundary conditions:

var element = document.getElementById("moose-equation-32d8a130-e870-4a36-b947-8f41ee72232b");katex.render("D\\dfrac{\\partial u}{\\partial n} = h", element, {displayMode:true,throwOnError:false});

over the boundaries specified by the "dirichlet_boundaries" and "neumann_boundaries" parameters respectively.

The values set at the Dirichlet boundary conditions, $var element = document.getElementById("moose-equation-3d18e9f2-1b30-4c71-bf13-b7c0223be63f");katex.render("g", element, {displayMode:false,throwOnError:false});$ , and Neumann boundary conditions, $var element = document.getElementById("moose-equation-39c90231-341b-4f18-b9fe-592db27654ae");katex.render("h", element, {displayMode:false,throwOnError:false});$ , are set by the "boundary_values" and "boundary_fluxes" respectively.