xCOG()

i = 1,2,3 (only applies of body is of type %MOVE_rigid% !) :: yields the x-, y-, z-component of the center of gravity for the given $MOVEFlag$, respectively. i = 4 (only applies if body is of type %MOVE_MassSpringDashpot% !) :: yields the length change of the body (spring-dashpot structure) at the MF timestep intervals. i = 5 (only applies if body is of type %MOVE_MassSpringDashpot% !) :: yields the length change of the body (spring-dashpot structure) also at each MKS sub-timestep. $MOVEFlag$ is directly associated to all boundary elements carrying this MOVE-flag.