The Support Operator Method for Diffusion on Hexahedra:

- Represent the diffusion term (
*D*) as the divergence ( ) of a gradient ( ) - Explicitly define one of the operators (in this case, the divergence operator)
- Define the remaining operator (in this case, the gradient operator) as the discrete adjoint of the first operator
- The previous step is accomplished by discretizing a portion of a vector identity

Michael L. Hall