摘要
以商业软件Ansys14.0中的CFD模块Fluent为平台,通过程序接口加载UDF程序进行二次开发,采用流体体积法VOF(Volume of Fraction)和几何重构法(Geo-Reconstruct)捕捉流体分界面,利用动网格铺层技术Layering实现造波板的运动,同时在动量方程中添加源项实现阻尼消波,建立具有良好造波、消波功能的三维推板式数值波浪水池。利用本数值水池,结合理想流体Inviscid模型和湍流RNG k-ε模型,通过模拟具有不同波长、波高的余弦波研究粘性在数值波浪水池中的影响。结果分析表明,粘性力对流体质点的运动存在阻滞作用,从而使波高沿水池长度方向发生了明显的衰减,衰减幅度与波陡呈正比,衰减形式符合指数规律。
In this paper,based on CFD software Fluent,one module of the Ansys14.0,a three-dimensional numerical wave tank with piston-like wave maker is established by adding UDF programs to secondary development.The volume of fluid （VOF） method and Geo-Reconstruct method is used to track the free surface.The motion of wave maker is achieved by using of dynamic mesh method Layering.Meanwhile,source terms are added in the momentum equation in order to make wave damp.The relevant simulations verify that this numerical wave tank has effective wave-making and wave-absorbing function.On this basis,using the Inviscid model and RNG k-ε turbulence model,series of cosine waves with different length or height are simulated to research the influence of viscosity in NWT.The simulation result shows that viscosity can reduce velocity of fluid particle,so that results in wave height attenuation along the length of NWT obviously.The attenuation amplitude is in direct proportion to wave steepness and attenuation form corresponds to exponential law.
出处
《舰船科学技术》
北大核心
2014年第5期42-48,共7页
Ship Science and Technology
基金
国家自然科学基金资助项目(51179077
51209107)
江苏高校优势学科建设工程资助项目
