| Matrix or Vector | Shape Functions | Integration Points |
|---|---|---|
| Fluid Stiffness and Mass Matrices | Equation 11–223 | 2 x 2 x 2 |
| Coupling Stiffness and Mass Matrices (fluid-structure interface) | Equation 11–214, Equation 11–215, Equation 11–216, and Equation 11–223 specialized to the interface | 2 x 2 |
| Fluid Damping Matrix (fluid at fluid-structure interface) | No shape functions are used. Instead, the area associated with each node at the interface is computed for the damping to act upon. | None |
Acoustics describes the derivation of acoustic element matrices and load vectors.