Accession Number : ADA329156

Title :   Validation of SHIPMO7 and PRECAL with a Warship Model.

Descriptive Note : Technical memo.

Corporate Author : DEFENCE RESEARCH ESTABLISHMENT ATLANTIC DARTMOUTH (NOVA SCOTIA)

Personal Author(s) : Chow, Dann L. ; McTaggart, Kevin A.

PDF Url : ADA329156

Report Date : NOV 1996

Pagination or Media Count : 122

Abstract : This technical memorandum describes a validation study of SHIPMO7 and PRECAL, two frequency domain codes for predicting ship motions and sea loads in waves. SHIPMO7 is a strip theory code while PRECAL is a three-dimensional panel code. Results from the two codes are compared with non-proprietary experimental data for a warship model. In general, SHIPMO7 gives good agreement with motions and sea loads, while PRECAL is slightly inferior. The consistently better results for SHIPMO7 in the lateral plane are likely due to its careful treatment of appendage and viscous forces. Neglecting rudder autopilot motions does not appear to influence significantly predictions from either code. A proposed approximate method for predicting sectional gyradii leads to satisfactory predictions of torsional moment.

Descriptors :   *SHIP MOTION, *COMPUTER PROGRAM VERIFICATION, OCEAN WAVES, PITCH(MOTION), HYDRODYNAMIC CHARACTERISTICS, CANADA, HYDRODYNAMIC CODES, SHIP MODELS, SEAKEEPING, FREQUENCY DOMAIN, MARINE RUDDERS, SHIP HULLS.

Subject Categories : Computer Programming and Software
      Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE