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Turbulence Receptivity of Longitudinal Vortex-Dominated Flows

机译：纵向涡流主导流的湍流接受性

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The transient effect of turbulence forcing on an isolated vortex has been investigated by means of Large Eddy Simulation. A dynamic mixed model is used to relate resolved and subgrid scale fluctuations in an incompressible CFD code. The initial condition is an Oseen vortex developing in a periodic box and subsequently forced by a superimposed turbulence. Turbulence is imposed in three different situations, separately outside or inside the initial vortex core and in the whole computational domain. The instantaneous flow field is observed for an outside forcing and it exhibits a wandering motion of the vortex as a whole. The velocity fluctuations grow near the vortex axis while they decrease for an inside forcing. The whole domain forcing is close to the external forcing, implying that most of the turbulence interaction is induced by the outer zone. An analytical investigation of the wandering effect shows that the near-axis fluctuations are mainly produced by this effect.
机译：通过大涡模拟研究了湍流强迫对孤立涡旋的瞬态影响。动态混合模型用于关联不可压缩的CFD代码中的已分解和次网格规模波动。初始条件是Oseen涡流在周期性的盒子中发展，随后受到叠加湍流的推动。湍流是在三种不同情况下施加的，分别在初始涡旋核的内部或外部以及整个计算域中。观察了瞬时流场的外部强迫，它显示了整个涡流的漂移。速度波动在涡流轴附近增大，而在内部强迫作用下减小。整个域强迫接近外部强迫，这意味着大部分湍流相互作用是由外部区域引起的。对漂移效应的分析研究表明，近轴波动主要是由这种效应引起的。

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