Breaking Wave Simulations of High-speed Surface Combatant using OpenFOAM
Breaking Wave Simulations of High-speed Surface Combatant using OpenFOAM
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发表时间：
2017-06
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通讯作者：
D. Wan
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作者：
D. Wan
船舶在艏、肩、艉波上的破波对高速水面船舶的水动力性能有着重要的影响。本文采用基于非定常VOF的RANS方法求解并研究了静水中高速水面舰艇的破波问题。采用OpenFOAM软件中的高分辨率VOF方法结合人工压缩技术，精确求解了船首波浪以及诱导的自由表面伤痕和旋涡。为了提供对船舶破碎波的物理理解，进行了三种船速（Fr=0.28，Fr=0.35，Fr=0.41）的模拟。基准船模型DTMB 5415被用于所有的模拟和广泛的实验流数据（由INSEAN和IIHR提供）可用于验证计算流体动力学结果。给出了预报的船舶阻力、波高和船体周围流速，并与试验测量结果进行了比较。在高速条件下，即Fr=0.35和Fr=0.41，观察到船头波浪上的波浪破碎。同时也解决了诱导的自由表面伤痕，并显示了破碎波周围的旋涡，以供进一步分析。计算流体力学解在波浪高程方面与实验结果吻合较好，而预测的肩波及其破碎却很难解决。结果表明，基于VOF的RANS方法能够准确地预测出破碎艏波的尾迹区。
Wave breaking on ship bow, shoulder and stern waves is of great importance for the hydrodynamic performance of high-speed surface ships. In the present work, an unsteady VOF based RANS method is used to resolve and investigate wave breaking around a high-speed surface combatant advancing in calm water. High resolution VOF method with artificial compression technique in OpenFOAM is used to accurately resolve ship bow waves as well as induced free surface scars and vortices. In order to provide physical understanding of ship breaking waves, simulations over three ship speeds, i.e. Fr=0.28, Fr=0.35, Fr=0.41, are carried out. The benchmark ship model DTMB 5415 is used for all the simulations and extensive experimental flow data (provided by INSEAN and IIHR) are available to validate the CFD results. Predicted ship resistance, wave elevations and flow velocities around ship hull are presented and compared with the experimental measurement. Wave breaking on ship bow waves are observed for high speed conditions, i.e. Fr=0.35 and Fr=0.41. The induced free surface scars are also resolved and vortices around breaking waves are shown for further analyzing. The CFD solution show good agreement with the experiment for wave elevations while the predicted shoulder wave and its breaking can hardly resolved. Comparisons of velocity components at cross planes show that the present VOF based RANS method can accurately predict the wake region associated with breaking bow wave.