Numerical seakeeping predictions including interaction effects between two ships


  1. Li, L.
  2. He, Y.J.
  3. Hsiung, C.C.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Dalhousie Univ, Halifax NS (CAN) Centre for Marine Vessel Development and Research
A modified version of the SHIPINT program, SHIPINT2, has been developed to compute the restraining forces and motions of the two ship interaction problem in accordance with prescribed captive model test conditions. The coupled motions are computed using a three-dimensional panel method with zero forward speed Green's function and a simple forward speed correction. With this method, the field points and source points are distributed on the wetted surface of two ships (ship-a and ship-b). The unsteady hydrodynamic forces, wave exciting forces and coupled motion amplitudes are computed based on the two ships interacting. Two ship double-body flow is used to determine the steady flow disturbance potential and velocity distribution. In this computation, the m-term computation is performed by the integral equation method based on the double body flow of two ships interacting. Alternatively, with the uniform flow assumption, the approximate m-terms can also be used in this study. Schmitke's method is applied to compute the viscous roll damping coefficients for ship-a and ship-b separately. The viscous interaction between the two ships is neglected. Spectral analyses for irregular waves are also carried out for ship-a and ship-b. Calculations have been carried out in regular waves with heading angles of 120, 150, and 180 degrees for two forward speeds of 12 knots and 0 knots. TRUNCATED
Frequency domain;Sea loads;3-dimensional panel method;Hydrodynamic pressures;Two ship interaction;Wave loads;Roll damping;Restraining forces
Report Number
DREA-CR-2000-050 — Contractor Report
Date of publication
01 Apr 2000
Number of Pages
Hardcopy;Document Image stored on Optical Disk

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