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A framework for efficient irregular wave simulations using Higher Order Spectral method coupled with viscous two phase model

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Journal of Ocean Engineering and Science 2017年第4期2卷 253-267页

作者： Inno Gatin Vuko Vukčević hrvoje jasak Faculty of Mechanical Engineering and Naval Architecture University of ZagrebIvana Lučića 5ZagrebCroatia Wikki Ltd. 459 Southbank HouseSE17SJ LondonUnited Kingdom

In this paper a framework for efficient irregular wave simulations using Higher Order Spectral method coupled with fully nonlinear viscous,two-phase Computational Fluid Dynamics(CFD)model is *** model is based on solution decomposition via Spectral Wave Explicit Navier-Stokes Equation method,allowing efficient coupling with arbitrary potential flow *** Order Spectrum is a pseudo-spectral,potential flow method for solving nonlinear free surface boundary conditions up to an arbitrary order of *** is capable of efficient long time nonlinear propagation of arbitrary input wave spectra,which can be used to obtain realistic extreme *** facilitate the coupling strategy,Higher Order Spectrum method is implemented in foam-extend alongside the CFD *** of the Higher Order Spectrum method is performed on three test cases including monochromatic and irregular wave ***,the coupling between Higher Order Spectrum and CFD is validated on three hour irregular wave ***,a simulation of a 3D extreme wave encountering a full scale container ship is shown.

关键词： Higher Order Spectral method Irregular waves Extreme waves CFD Foam-extend

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Monolithic Coupling of the Pressure and Rigid Body Motion Equations in Computational Marine Hydrodynamics

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Journal of Marine Science and Application 2017年第4期16卷 375-381页

作者： hrvoje jasak Inno Gatin Vuko Vukcevic Faculty of Mechanical Engineering and Naval Architecture University of Zagreb 10000 Zagreb Croatia

In Fluid Structure Interaction(FSI) problems encountered in marine hydrodynamics, the pressure field and the velocity of the rigid body are tightly coupled. This coupling is traditionally resolved in a partitioned manner by solving the rigid body motion equations once per nonlinear correction loop, updating the position of the body and solving the fluid flow equations in the new configuration. The partitioned approach requires a large number of nonlinear iteration loops per time–step. In order to enhance the coupling, a monolithic approach is proposed in Finite Volume(FV) framework,where the pressure equation and the rigid body motion equations are solved in a single linear system. The coupling is resolved by solving the rigid body motion equations once per linear solver iteration of the pressure equation, where updated pressure field is used to calculate new forces acting on the body, and by introducing the updated rigid body boundary velocity in to the pressure equation. In this paper the monolithic coupling is validated on a simple 2D heave decay case. Additionally, the method is compared to the traditional partitioned approach(i.e. "strongly coupled" approach) in terms of computational efficiency and accuracy. The comparison is performed on a seakeeping case in regular head waves, and it shows that the monolithic approach achieves similar accuracy with fewer nonlinear correctors per time–step. Hence, significant savings in computational time can be achieved while retaining the same level of accuracy.

关键词： monolithic coupling pressure equation rigid body motion computational fluid dynamics marine hydrodynamics seakeeping

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基于粘弹本构的水辅注塑充填过程的仿真分析

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高分子材料科学与工程 2014年第9期30卷 93-96页

作者：章凯匡唐清柳和生曾效舒邓洋 hrvoje jasak 南昌大学聚合物加工实验室江西南昌330031 华东交通大学机电工程学院江西南昌330013 南昌大学机电学院江西南昌330031 萨格勒布大学机械工程学院和海军建筑

水辅注塑成型工艺适合于生产中空或者部分中空的塑料制品,对其充填过程进行粘弹特性的研究可以加深相关工艺参数对其影响的理解。文中以开源计算代码OpenFOAM为基础,采用面向对象编程方法和流体体积法(VOF)构建了基于Giesekus粘弹本构... 详细信息

水辅注塑成型工艺适合于生产中空或者部分中空的塑料制品,对其充填过程进行粘弹特性的研究可以加深相关工艺参数对其影响的理解。文中以开源计算代码OpenFOAM为基础,采用面向对象编程方法和流体体积法(VOF)构建了基于Giesekus粘弹本构的聚合物熔体三维多相流等温流动过程的计算模块,以水辅注塑成型充填过程为例进行了数值求解,得出熔体残余壁厚和水相的穿透距离都随着注水速度的增加而增加的结论,与Polynkin等相关实验所得结论一致,并根据聚合物熔体所固有的粘弹特性进行了说明。

关键词：水辅注塑粘弹特性 Giesekus模型流体体积法

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