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首页> 外文会议>ASME/JSME Joint Fluids Engineering Conference >CLOSURE PROPOSALS FOR THE LANGEVIN EQUATION MODEL IN LAGRANGIAN TWO-PHASE FLOW MODELLING
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CLOSURE PROPOSALS FOR THE LANGEVIN EQUATION MODEL IN LAGRANGIAN TWO-PHASE FLOW MODELLING

机译：拉格朗日两相流量建模的Langevin方程模型的关闭提案

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摘要

The purpose of the present paper is to discuss issues relevant to stochastic modelling of the fluid velocities sampled by solid particles as they move across turbulent flows. Accurate modelling of these velocities is important in particular to simulate turbulent dispersion effects. Instead of proposing a model only for fluctuating components of fluid velocities, the present approach models the instantaneous fluid velocities. A stochastic diffusion process, referred to as a Langevin Model, is retained. Once the class of models is chosen, closure proposals for the drift and diffusion terms are put forward. The complete model is developed in terms of the trajectories of the stochastic process but amounts to a closure of the joint probability density function of particle and fluid velocities.
机译：本文的目的是讨论与通过固体颗粒采样的流体速度的随机建模相关的问题，因为它们在湍流流动移动时。这些速度的精确建模尤其是模拟湍流色散效果。当前方法而不是仅提出仅针对流体速度的组件的波动的模型，而是模拟瞬时流体速度。保留了作为Langevin模型的随机扩散过程。一旦选择了类别的模型，提出了漂移和扩散术语的闭合提案。完整的模型是根据随机过程的轨迹而开发的，但是缩小颗粒和流体速度的关节概率密度函数的封闭。

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