船载养殖水体纵摇运动下流场特性数值分析

发展以大型游弋式养殖工船可为深蓝渔业提供新的养殖手段。本文基于STAR-CCM数值计算软件研究了纵摇运动下养殖液舱内流场特性和壁面压力,建立了养殖液舱内适渔性的评估方法。典型海况中船舶纵摇运动对养殖液舱中流场的影响研究表明：当养殖液舱纵摇频率一定时,液舱内流速及壁面压力随纵摇幅值增大而增大;当养殖液舱纵摇与养殖水体发生共振时,液舱内流速及壁面压力急剧增大,对养殖对象安全及结构强度均有较大不利影响。对于海上养殖工船的养殖安全运行,选择风浪流条件合适的渔场,结合船体耐波性研究,优化船体型线,调节养殖舱水体固有频率,避开共振运动,是养殖工船适渔性研究的一个重要方向。

Numerical analysis on the water environment in the tank of the aquaculture vessel under pitch motion

The development of large-scale cruising aquaculture vessels can provide a new breeding method for deep-sea fishery. Based on the STAR-CCM numerical calculation software, this paper studies the characteristics of the flow field and the wall pressure in the tank under the pitching motion, and establishes the evaluation method of fishing suitability in the tank of the aquaculture vessel. The research on the influence of vessel"s pitch motion on the flow field of aquaculture tank in typical sea conditions shows that: when the pitch frequency of the tank is constant, the velocity and wall pressure in the tank increase with the increase of pitch amplitude, and when the tank pitch resonates with the aquaculture water body, the velocity and wall pressure in the tank increase sharply, which has a great negative impact on the safety of the breeding object and structural strength. For the safe operation of aquaculture vessels on the sea, selecting suitable wind, wave and current conditions, combining the study of seakeeping, optimizing the hull line, adjusting the natural frequency of the aquaculture tank water body, and avoiding resonance motion are the researches on the fishing suitability of the aquaculture vessel.