Extensive numerical simulations of a spatially evolving turbulent planar at a mediate Reynolds number have been carried out using the improved nonreflecting Sommerfeld convective boundary conditions at the out flow. The finite-difference numerical technology used to perform the single-phase simulations solves the two-dimensional, time-dependent conservation equations for a viscous fluid usifng the fractional-step projection method. Valid inflow and outlflow boundary conditions implemented lead to the proper representation of the vortex dynamics in the jet flow. Many essential features of the coherent structure evolution in good agreement with the results observed in experiments have been reproduced in the simulations, such as the "Batchelor's couples" or tri-poles phenomena and a regular quasi-2D Von Karman street in the planar jet.
展开▼
机译：在出口处使用改进的非反射Sommerfeld对流边界条件，对中等Reynolds数的空间演化湍流平面进行了广泛的数值模拟。用于执行单相模拟的有限差分数值技术使用分数步投影法求解了粘性流体的二维，与时间有关的守恒方程。实施有效的流入和流出边界条件会导致射流中涡旋动力学的正确表示。在模拟中，再现了相干结构演化的许多基本特征，这些特征与实验中观察到的结果非常吻合，例如“ Batchelor夫妇”或三极现象以及平面射流中的规则准2D Von Karman街。
展开▼
