采用基于边界瞬时涡量守恒（IVCBC）的纯拉格朗日涡方法，结合并列双圆柱的结构特点，建立双圆柱绕流数值计算模型。在间隙率T/D=1.1~2.6时，并列双圆柱绕流会出现宽尾流（WW）和窄尾流（NW）现象。利用两圆柱间隙中心点的诱导速度方向与间隙流的偏转方向同步的特性，提出一种区别宽、窄尾流的数值计算方法；比较间隙流的偏转方向与该间隙中点的速度偏转方向，并进行典型的算例分析。结果表明：该方法能准确区别宽尾流和窄尾流，可为数值研究这一特殊区域的流体特征提供重要的数值计算方法。%A pure-Lagrangian vortex method, based on Instantaneous Vorticity Conserved Boundary Condi⁃tions (IVCBC), is adopted to build the numerical calculation model of flow around double circular cylinders that have the same structure characteristics of two side by side circular cylinders. The Wide Wake(WW) and Narrow Wake(NW)appear in the range of pitch ratio T/D=1.1~2.6. A scheme is proposed to distin⁃guish the NW and WW through the direction synchronism between induced velocity at the middle of double circular cylinders and deflection of gap flow. By comparing the directions of the above two flowing condi⁃tions and analyzing the classic case, it is concluded that the proposed method could distinguish WW and NW accurately, which offers an important numerical calculation method for investigating the flow character⁃istics in this range.
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