Accession Number : AD0650197

Title :   AN EXPERIMENTAL INVESTIGATION OF THE ROLE OF AIR IN SHIP SLAMMING.

Descriptive Note : Technical rept.,

Corporate Author : CALIFORNIA UNIV BERKELEY COLL OF ENGINEERING

Personal Author(s) : Lewison,Grant

Report Date : NOV 1966

Pagination or Media Count : 67

Abstract : The report describes theoretical and experimental work on water impact. Both the theory and the experiments were devised to elucidate the effect of the air in the impact of a rectangular steel flat-bottomed model upon an otherwise quiescent water surface. Computations based upon the theory provided estimates of the air pressure under the model and of the velocity of the air escaping from under the model. The air velocity was measured experimentally by means of high-speed motion photography of small styrofoam balls underneath the model. Simultaneously the motion of the water surface was recorded as well as the pressure at the center and near the edge. The most important result to emerge from the work is that the peak pressure can be drastically reduced if flanges are fitted to the flat bottom to entrap air. (Author)

Descriptors :   (*SHIP HULLS, IMPACT SHOCK), (*FLUID MECHANICS, SHIPS), AIR, SHIP MODELS, GAS FLOW, PRESSURE, DAMPING, FLOW VISUALIZATION, VELOCITY

Subject Categories : Marine Engineering
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE