Dynamic overset grids in OpenFOAM with application to KCS self-propulsion and maneuvering
Dynamic overset grids in OpenFOAM with application to KCS self-propulsion and maneuvering
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OpenFOAM 中的动态重叠网格及其在 KCS 自推进和机动中的应用
DOI：
10.1016/j.oceaneng.2015.07.035
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发表时间：
2015-11-01
影响因子：
5
通讯作者：
Carrica, Pablo M.
中科院分区：
文献类型：
--
作者：
Shen, Zhirong;Wan, Decheng;Carrica, Pablo M.
介绍了利用开放源码OpenFOAM开发的NAOE-SPEAM-SJTU求解器中动态重叠网格技术的实现。OpenFOAM由于其高质量的自由面求解器和其他功能而对船舶水动力学应用具有吸引力，但它缺乏执行操纵和耐波性问题所需的大幅度运动的能力。该实现依赖于代码Suggar在运行时动态计算域连接信息(DCI)。多个Suggar组可用于多个滞后执行模式，允许同时评估多个DCI集，以减少执行时间并优化OpenFOAM和Suggar处理器之间的数据交换。KRISO集装箱船(KCS)的拖曳条件下进行了静态倾覆试验，KP505螺旋桨的开水曲线和KCS模型的自航和之字形操纵来验证动态实施。对于自航，船模安装了KP505螺旋桨，在Fr=0.26时实现自航。所有自航系数仅使用CFD结果，包括开水曲线、拖曳和自航条件下的自航系数。计算结果与阻力、自由面高程、尾迹流和自航系数等实验数据吻合较好。在自航螺旋桨转速不变的情况下，对加入HSVA螺旋桨和半平衡喇叭舵的HSVA KCS模型进行了自由操纵仿真。对标准的10/10之字形机动和改进的15/1之字形机动的计算结果与实验数据吻合较好，即使使用了相对较粗的网格。对敞水螺旋桨试验和裸体KCS模型进行了网格收敛研究，进一步验证了OVERSET网格方法的实施。(C)2015爱思唯尔有限公司。保留所有权利。
An implementation of the dynamic overset grid technique into naoe-FOAM-SJTU solver developed by using the open source code OpenFOAM is presented. OpenFOAM is attractive for ship hydrodynamics applications because of its high quality free surface solver and other capabilities, but it lacks the ability to perform large-amplitude motions needed for maneuvering and seakeeping problems. The implementation relies on the code Suggar to compute the domain connectivity information (DCI) dynamically at run time. Several Suggar groups can be used in multiple lagged execution mode, allowing simultaneous evaluation of several DCI sets to reduce execution time and optimize the exchange of data between OpenFOAM and Suggar processors. A towed condition of the KRISO Container Ship (KCS) are used for static overset tests, while open-water curves of the KP505 propeller and self-propulsion and zig-zag maneuvers of the KCS model are exercised to validate the dynamic implementation. For self-propulsion the ship model is fitted with the KP505 propeller, achieving self-propulsion at Fr=0.26. All self-propulsion factors are obtained using CFD results only, including those from open-water curves, towed and self-propulsion conditions. Computational results compare well with experimental data of resistance, free-surface elevation, wake flow and self-propulsion factors. Free maneuvering simulations of the HSVA KCS model appended with the HSVA propeller and a semi-balanced horn rudder are performed at constant self-propulsion propeller rotational speed. Results for a standard 10/10 zig-zag maneuver and a modified 15/1 zig-zag maneuver show good agreement with experimental data, even though relatively coarse grids are used. Grid convergence studies are performed for the open-water propeller test and bare hull KCS model to further validate the implementation of the overset grid approach. (C) 2015 Elsevier Ltd. All rights reserved.