In the second wind-induced regime, the jet deformations are influenced by aerodynamic instabilities acting on the jet surface. In addition, velocity relaxation in the liquid is an important mechanism with a strong influence on the violent break-up of laminar jets (i.e., the bursting). The exact interplay between the aerodynamic forces and the velocity profile relaxation is insufficiently described in the literature. Thus, we investigate numerically cylindrical liquid jets with fully developed and uniform velocity inlet profiles for different liquid and gas properties to elucidate the physical mechanisms governing the bursting of the jet. For this study, the gas-liquid interface is tracked using a front tracking technique: the Local Front Reconstruction Method (LFRM). In contrast with traditional front tracking techniques, LFRM allows for complex topological changes (merging and break-up) while keeping a sharp representation of the interface. The comparison of the obtained results with literature suggests that LFRM is a suitable technique for capturing the complex morphological deformations of a bursting jet. Additionally, we analyzed the influence of air and liquid properties on the jet deformations, which evidenced that velocity profile relaxation plays an important role in the complex process of break-up of the jet, that in combination with the destabilizing effect of the aerodynamic forces lead to the bursting of the jet.

中文翻译：

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使用局部锋面重建方法对二次风诱导状态下的急流破裂进行数值模拟


在第二种风致状态下，射流变形受作用在射流表面的空气动力学不稳定性的影响。此外，液体中的速度弛豫是一种重要的机制，对层流的剧烈破裂（即爆裂）有很大影响。文献中没有充分描述空气动力和速度分布松弛之间的确切相互作用。因此，我们研究了针对不同液体和气体特性的数值圆柱形液体射流，这些液体射流具有充分发展和均匀的速度入口剖面，以阐明控制射流爆发的物理机制。在本研究中，使用前跟踪技术跟踪气液界面：局部前重建方法 （LFRM）。与传统的 front tracking 技术相比，LFRM 允许复杂的拓扑变化（合并和分解），同时保持界面的清晰表示。所获得的结果与文献的比较表明，LFRM 是捕获爆裂射流复杂形态变形的合适技术。此外，我们分析了空气和液体特性对射流变形的影响，这证明速度分布松弛在射流破裂的复杂过程中起着重要作用，这与空气动力的不稳定作用相结合，导致射流破裂。