求解SUBOFF绕流问题的粘势流耦合方法

发布时间：2018-02-03 02:00

  本文关键词： 粘势流耦合 OpenFOAM Helmholtz速度分解定理 SUBOFF光体　出处：《中国造船》2017年01期 　论文类型：期刊论文

【摘要】：针对SUBOFF光体绕流问题,根据Helmholtz速度分解定理将流场速度分解为势流部分和非势流部分,代入到N-S方程推导得到耦合势流速度的关于非势流速度的控制方程,其中势流部分速度采用数值方法预先求得,非势流部分控制方程的表达与N-S方程一致,可直接采用传统N-S方程的计算方法求解。文中在Open FOAM平台内实现了SUBOFF绕流问题的粘势流耦合计算,通过对不同来流速度下的SUBOFF绕流的计算模拟,并将耦合方法计算获得的流场中的速度、压力等,与文献中试验结果以及传统计算流体动力学(CFD)等计算的结果进行仔细比较和分析,相关结果吻合良好。流场中的非势流部分速度分量在远场较小,甚至趋于0,论文分析考察了较传统CFD方法计算范围小的区域,将粘势流耦合方法与传统CFD方法进行了计算研究和对比。研究表明,粘势流耦合方法对区域大小不敏感,可以采用更小的计算区域,同时提高计算效率;该方法适用于绕流问题的计算模拟,为改善CFD计算效率提供了新的途径。
[Abstract]:According to the Helmholtz velocity decomposition theorem, the velocity of the flow field is decomposed into the potential flow part and the non-potential flow part. The governing equation about the non-potential flow velocity of coupled potential flow velocity is derived by substitution of N-S equation, in which the partial velocity of potential flow is obtained in advance by numerical method. The expression of the partial governing equation of non-potential flow is consistent with that of N-S equation. The traditional N-S equation can be solved directly. In this paper, the visco-potential flow coupling calculation of the SUBOFF flow around the SUBOFF is realized on the Open FOAM platform. The velocity and pressure in the flow field obtained by the coupling method are calculated by the simulation of the flow around SUBOFF at different incoming velocities. The results are compared and analyzed carefully with the experimental results in literature and those calculated by conventional computational fluid dynamics (CFDs). The correlation results are in good agreement with each other. The non-potential flow partial velocity components in the flow field are smaller in the far field. Even toward zero, the paper analyzes and inspects the region which is smaller than the traditional CFD method, and studies and compares the viscous potential flow coupling method with the traditional CFD method. The visco-potential flow coupling method is not sensitive to the size of the region, so it can use a smaller calculation area and improve the computational efficiency. This method is suitable for the simulation of flow around the flow and provides a new way to improve the efficiency of CFD calculation.
【作者单位】： 上海交通大学船舶海洋与建筑工程学院海洋工程国家重点实验室高新船舶与深海开发装备协同创新中心;
【基金】：973项目(2014CB046203) 国家自然科学基金资助项目(51579147,51479117)
【分类号】：O357.5
【正文快照】： 在许多水动力学问题中,粘性起着非常重要的作用,但考虑粘性的影响会使问题变得相当复杂。势流理论是忽略流体粘性并假定流体流动无旋的基础上发展起来的,可以准确估算粘性影响较弱的各种水动力学问题,如波浪传播、船体移动兴波等各类问题。在粘性影响较为显著的物理问题上势流，

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