The kinetic energy of the fluid being displaced by the movement of a rigid body can be written in terms of the body translation and angular velocities in the same way the kinetic energy of the body can be written in terms of its translation and angular velocities. The coefficients of proportionality are the added mass coefficients, which are the elements of the added-mass matrix, which is analogous to the body inertia matrix.

Timothy S Choe
2003-03-15