A NOVEL METHOD FOR IDENTIFYING VORTICAL STRUCTURES

A NOVEL METHOD FOR IDENTIFYING VORTICAL STRUCTURES
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识别旋涡结构的新方法

DOI:
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发表时间:
2002
期刊:
影响因子:
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通讯作者:
E. Rogers
E. Rogers
中科院分区:
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文献类型:
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作者:
R. Pemberton;S. Turnock;T. Dodd;E. Rogers

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本文提出了一种识别二维速度场中旋涡的方法。在2-D场中的每个点处计算基于相对于基准的局部速度角的函数。该函数在涡中心处为局部最小值。一个先进的统计技术,用于识别多个最小值是用来找到这个功能的最小值。该方法用于旋涡,使用RANS计算流体动力学代码(CFX 4.3)计算,形成一个非常大的原油运输船(VLCC)周围,结果被认为是接近中心的漩涡。
A method for identifying vortices in a 2-D velocity field is developed. A function based on the local angles of velocity with respect to a datum is calculated at each point in the 2-D field. This function is a local minimum at vortex centres. An advanced statistical technique for identifying multiple minima is used to find the minima of this function. The method is used for vortices, calculated using a RANS CFD code (CFX 4.3), forming around a very large crude carrier (VLCC) and the results are seen to be close to the centres of the vortices.