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- W3149683197 abstract "A new model to simulate passive scalar elds in large-eddy simulations of turbulence is presented. The scalar eld is described by clouds of tracer particles and the subgrid contribution of the tracer displacement is modelled by a kinematic model which obeys Kolmogorov’s inertial-range scaling, is incompressible and incorporates turbulent-like flow structure of the turbulent small scales. This makes it possible to study the scalar variance eld with inertial-range eects explicitly resolved by the kinematic subgrid eld while the LES determines the value of the Lagrangian integral time scale TL. In this way, the modelling approach does not rely on unknown Lagrangian input parameters which determine the absolute value of the scalar variance. The mean separation of particle pairs displays a well-dened Richardson scaling in the inertial range, and we nd that the Richardson constant G 0:07 which is small compared to the value obtained from stochastic models with the same TL. The probability density function of the separation of particle pairs is found to be highly non-Gaussian in the inertial range of times and for long times becomes Gaussian. We compute the scalar variance eld for an instantaneous line source and nd good agreement with experimental data." @default.
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- W3149683197 date "1998-01-01" @default.
- W3149683197 modified "2023-09-27" @default.
- W3149683197 title "Scalar Subgrid Model with Flow Structure for Large-Eddy Simulations of Scalar Variances" @default.
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- W3149683197 doi "https://doi.org/10.1007/978-94-011-5118-4_140" @default.
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