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基于非结构谱元法对横向排列双圆柱绕流在固定间距情况下进行了整体线性稳定性分析,首先用Newton方法求得某个Re数的定常解,再以Arnoldi方法处理线化小扰动方程,进一步得到定常解的若干优势特征值及其特征向量.通过计算首次给出了无量纲圆心距T/D=1.2时系统的临界ReC数,并根据超临界情况下优势特征向量重构了周期流动.
Based on the unstructured spectral element method, the global linear stability of a double cylindrical flow transversely arranged at a fixed distance is analyzed. First, a certain steady solution to Reynolds number is obtained by Newton’s method. Then the small perturbation equation , And then some dominant eigenvalues and eigenvectors of steady solutions are obtained.First, the critical ReC number of the system with dimensionless center distance T / D = 1.2 is given, and the cycle is reconstructed according to the dominant eigenvectors in supercritical conditions flow.