Mathematical Modeling Of The Hydrodynamic Forces On A Low Aspect-ratio Curved Otter Board

Abstract

As an important accessory of single trawl, otter board has the effect of providing net horizontal expansion. Hydrodynamic performance of otter board directly affects net horizontal expansion, affects further the catching and fishing efficiency[1-2].For improving the fishing efficiency and technology level and solving the world energy crisis in some way, carrying out the research of trawl door hydrodynamic performance in order to design and optimize new energy-efficient with high expansion and low drag force otter board becomes a new researchers’ focus [2].This paper selects a low aspect-ratio curved otter board as research object, presents a method based on the flume experiment results and for mathematical modeling of the hydrodynamic forces on the otter board. These forces have been found as a function of angles of attack and slip. The coefficients are parameterized for smoothing and computational performance.A method is summarized for extending to the evaluation of arbitrary shape otter board and outside the normal operating.A verified by experiment results computational efficient model of the steady state hydrodynamic forces is finally proposed, suitable for trawl control system design and analysis.