Hydrodynamic Interaction Between Bodies This option enables the user to include hydrodynamic interaction effects between an arbitrary number of bodies. See description here 1 input line HYDRodynamic COUPling DATA 1 input line CHCPL CHCPL: character(8): Hydrodynamic coupling identifier, must be unique 2 input lines TEXT TEXT: character(60): Character string 1 input line CHBDY_A CHBDY_A: character(8): Body identification for body A 1 input line CHBDY_B CHBDY_B: character(8): Body identification for body B Note that the body data for CHBDY_A and CHBDY_B must precede the hydrodynamic coupling data for the two bodies. 1. Coupled added mass data 1 input line COUPled ADDEd MASS 6 input lines AMi1 AMi2 AMi3 AMi4 AMi5 AMi6 AMij: real: An acceleration of body A in dof i will be multiplied with AMij to give a force on body B in dof j, and an acceleration of body B in dof j will be multiplied with AMij to give a force on body A in dof i \(\mathrm {[M,ML,ML^2]}\) 2. Coupled retardation function 1 input line COUPled RETArdation FUNCtion 1 input line TIMDEL TIMDEL: real: Time step in retardation function 1 input line RETArdation ELEment DATA 1 input line NRETij IDOF_A IDOF_B NRETij: integer: Number of time delays for which function is given for element (IELEM, JELEM) IDOF_A: integer: Degree of freedom body A IDOF_B: integer: Degree of freedom body B The velocity of body A degree of freedom IDOF_A will be convoluted with the retardation function to give a force/moment at body B in degree of freedom IDOF_B and the velocity of body B degree of freedom IDOF_B will be convoluted with the retardation function to give a force/moment at body A in degree of freedom IDOF_A. 1 input line (continue by continuation mark &) RETij(1)........RETij(NRETij) RETij(k): real: Retardation function value \(\mathrm {[F/L,FT,FL]}\) Body Data Specification Coupling Specification