PREDICTION OF TORPEDO GUIDANCE WIRE POSTLAUNCH INTERFERENCE WITH MANEUVERING SUBMARINES

A PROGRAM OF WORK LEADING TO AN ANALYTICAL CAPABILITY TO PREDICT THE POSTLAUNCH BEHAVIOR OF TORPEDO GUIDANCE WIRES IN THE VICINITY OF MANEUVERING SUBMARINES IS DESCRIBED. AN EXISTING METHOD TO PREDICT THE COMPLEX UNSTEADY FLOW FIELD NEAR THE LAUNCH VEHICLE WILL BE COMBINED WITH A METHOD TO PREDICT THE MOTION OF A FREE CABLE OR WIRE IN AN ARBITRARY FLOW FIELD. THE RESULTING METHOD WILL INCLUDE APPROXIMATE BOUNDARY CONDITIONS ON BOTH THE SUBMARINE AND THE WIRE TO PREVENT WIRE PENETRATION THROUGH THE SUBMARINE BOUNDARY, A COMMON PROBLEM WITH CURRENT CALCULATION METHODS. THE SUBMARINE FLOW FIELD CONSISTS OF NONLINEAR EFFECTS CAUSED BY FLOW SEPARATION FROM THE HULL AND TRAILING VORTICITY ASSOCIATED WITH APPENDAGE LOADINGS. THIS FLOW MODEL WILL BE APPLICABLE TO TYPICAL SUBMARINE CONFIGURATIONS IN VARIOUS MOTIONS, INCLUDING STEADY TURNS AND UNSTEADY MANEUVERS; THEREFORE, THE METHOD CAN BE USED TO PREDICT WIRE FOULING FOR A WIDE RANGE OF POSTLAUNCH CONDITIONS.