"A STUDY OF INTERACTION EFFECT BETWEEN TWO DIMENSIONAL WAVE DEVOURING PROPULSOR AND HULL"

波浪吞噬推进器（WDP）是一种将波浪能量转化为信任的装置。WDP的想法是由该项目的首席研究员提出的，并于1986年进行了实验验证。在1989年和1990年，进行了实际的海上试验，并成功地使用一艘装有WDP的小型船只。WDP的主体结构是位于船首下方的水翼，它产生推力并作为阻尼器限制船体运动。因此，WDP系统减小了波浪阻力的增加，提高了波浪和海浪中的推进效率。在可行性研究中，该装置将节省约50%的能源。然而，目前对该系统的研究并不发达。特别是WDP与船体之间的交互作用不清楚。研究者试图研究水翼与船体的相互作用效应。为了简化这一现象，引入了二维模型。船体结构被处理为位于圆形计算域中心的矩形形状。船体左右自由表面的高度随每个计算时间步长而变化。利用势理论和边界元法，对该问题进行了表述。为了模拟翼型产生的推力，在计算域中引入了均匀强度覆盖翼型表面，在每个时间步长处尾缘脱落并以诱导速度运动的涡奇点。为了解决这一问题，需要进行时间步长计算。因此，利用新引入的EWS开发了高速计算算法。从数值计算来看，相互作用取决于箔片的深度。

The Wave Devouring Propulsor (WDP) is a device which converts wave energy to the trust. The idea of WDP was proposed by the head researcher of this project and tested experimentally in 1986. In 1989 and 1990, actual sea trial was conducted and succeeded using a small vessel with WDP.WDP main structure is a hydrofoil located under the ship bow which generates thrust and also restricts the hull motion as a damper. Therefore the WDP system decrease the resistance increase in waves and improve the propulsive efficiency in waves and sea kindness. This device will save the energy about up to 50% at the feasibility study.Nevertheless the research of this system is not developed now. Especially interaction effect between WDP and hull was not clear. The researcher tried to study the interaction effect between hydrofoil and the hull.For simplify the phenomena, two dimensional model was introduced. The hull configuration was treated as a rectangular shape which is located in a center of circular calculation domain. The height of free surface, right and left of the hull, changed by each calculation time steps. Using the potential theory and boundary element method, this problem was formulated. To simulate the thrust generated by the foil, vortex singularity was introduced in the calculation domain which covered the surface of the foil at the uniform strength and shedded at the trailing edge at he each time steps and moved with induced velocity.To solve the problem, time step calculation was necessary. Therefore high speed calculation algorithm was developed using newly introduced EWS.From the numerical calulation, the interaction depends on the foil depth.