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A transfer of a tracer in decaying turbulent layer

机译:示踪剂在腐烂湍流层中的转移

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摘要

A mixing of a passive tracer inside a turbulent layer generated by a localized short-time perturbation is studied numerically. Two cases of initial distribution of the tracer are considered: two-layer and continuous with constant gradient. It is shown that, regardless of details of initial fields of a turbulent energy and dissipation in the layer, a tracer concentration goes with time to self-similar regimes. Distributions of the concentration inside the layer are found to be substantially nonuniform, with a ratio of concentration gradient in the middle of the layer to initial gradient about 0.5.
机译:数值研究了由局部短时扰动产生的湍流层内部无源示踪剂的混合。考虑了示踪剂初始分布的两种情况:两层且连续且梯度恒定。结果表明,无论层中湍流能量和耗散的初始场的细节如何,示踪剂浓度都会随着时间推移而达到自相似状态。发现层内的浓度分布基本不均匀,层中间的浓度梯度与初始梯度的比率约为0.5。

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