| Matrix or Vector | Shape Functions | Integration Points |
|---|---|---|
| Diffusivity Matrix and Diffusing Substance Generation Load Vector | Equation 11–193 | 4 |
| Damping Matrix | Same as diffusivity matrix. If KEYOPT(1) = 1, the matrix is diagonalized as described in Lumped Matrices | 11 |
| Diffusion Flux Load Vector | Equation 11–193 specialized to the face | 6 |
Diffusion in the Theory Reference describes the derivation of diffusion element matrices and load vectors as well as diffusion flux evaluations. If KEYOPT(1) = 1, the damping matrix is diagonalized as described in Lumped Matrices.