Browsing by Author "Kizakkevariath, Sankaranarayanan"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Hydrodynamic analysis and computer simulation applied to ship interaction during maneuvering in shallow channels
    Kizakkevariath, Sankaranarayanan (Virginia Polytechnic Institute and State University, 1989)
    A generalized hydrodynamic interaction force model is combined with a ship maneuvering simulator to provide a free-running, closed loop ship simulation capable of trajectory predictions of ships operating in close proximity in a shallow, asymmetric canal. The interaction force model is based on the generalized Lagally's theorem, properly accounting for the orientations and dynamic motions of the ships. Also included are the lift forces and the cross-flow drag forces, which are found to be important for bank suction phenomena. A simplified method is implemented for box shapes, applicable for barge-tows operating in rivers. Results of the calculations are found to be generally in good agreement with experimental and other theoretical results. This work would have utility in studying maneuvers involving ships and barges in close proximity and can be used in training pilots who operate in canals, harbors and rivers, and also in studying the effects of various steering control systems in the early design stages.
  • Thumbnail Image
    Hydrodynamic interaction of passing ships in a shallow asymmetric canal
    Kizakkevariath, Sankaranarayanan (Virginia Polytechnic Institute and State University, 1986)
    A theoretical model and associated computer program are developed to compute hydrodynamic interaction forces and moments on passing ships in a shallow asymmetric canal, by applying generalized Lagally's theorem. Steady lift force on the ships are estimated following standard slenderbody approach. Passing ships are assumed to travel at constant speeds, parallel to the canal walls. Ships are assumed to be slender, the fluid is ideal and wave making effects are ignored. Numerical calculations for several passing cases show good agreement with existing model test results.