Process Simulation Of An Unsymmetrical Catamaran Slamming In Regular Waves

Slamming is a common phenomenon when ships sailing in terrible sea conditions. There will be a great instantaneous pressure on the local structure surface when slamming. The hull structure will be damaged under frequent slamming loads, which often leading to serious accidents. As a new type of ships, the slamming phenomenon of a catamaran is more complicated. So, the research of slamming of catamarans is important both theoretical and practical.This paper, we simulate the process of an unsymmetrical catamaran slamming in regular waves via Ls-Dyna. Analyze the slamming characteristics. We obtained some significant results, which are valuable for solving practical problems.(1) At first, we summarize the research previous, then, we introduce the basic theory of 2-D water entry problem, including both a wedge and a flat-bottom, and at last, we discuss theory of 3-D water entry problem of a wedge.(2) Simulate the process of the unsymmetrical catamaran slamming in the regular waves, analysis the features of the motion when slamming.(3) Analysis the stress of the unsymmetrical catamaran slamming in the regular waves, summarize the characteristics of the stress distribution when slamming.(4) Analysis the characteristics of the vertical component of the external force applied on the unsymmetrical catamaran when slamming in the regular waves, summarize the influence of the buoyancy on the hull when slamming.(5) Analysis the differences between the unsymmetrical catamaran and the symmetrical catamaran when slamming.(6) Analysis the pressure on the typical elements of the unsymmetrical catamaran slamming in the regular waves, summarize regular patters when slamming.