ПАРАМЕТРИЗАЦИЯ КОЭФФИЦИЕНТА ВЕРТИКАЛЬНОГО ТУРБУЛЕНТНОГО ОБМЕНА В РАМКАХ ПОДХОДА LES

S.V Protsenko,A.M Atayan

doi:10.23947/2587-8999-2021-1-1-26-35

Abstract

The vertical turbulent exchange coefficient parametrization based on the LES approach is constructed in this paper. To implement this approach, water flow velocities pulsations full-scale data at some points of shallow-water systems obtained using an acoustic Doppler flow meter (ADCP) during expedition studies were filtered using two-stage Kalman algorithm, and then averaged, after which the LES approach was applied using subgrid turbulence model. The parametrization of the coefficient of vertical turbulent exchange is used in the wave hydrodynamics mathematical model.

Highlights

COMPUTATIONAL MATHEMATICS AND INFORMATION TECHNOLOGIESVERTICAL TURBULENT EXCHANGE COEFFICIENT PARAMETRIZATION IN THE FRAMEWORK OF THE Large eddies simulation (LES) APPROACH
The term «model» in the turbulent motion description using the Navier-Stokes equations is understood as additional assumptions about the turbulent flow that allow calculating its average characteristics, with the addition of source and other terms or other «model» modifications
The parametrization of the coefficient of vertical turbulent exchange is used in the wave hydrodynamics mathematical model

Summary

COMPUTATIONAL MATHEMATICS AND INFORMATION TECHNOLOGIES

VERTICAL TURBULENT EXCHANGE COEFFICIENT PARAMETRIZATION IN THE FRAMEWORK OF THE LES APPROACH. The vertical turbulent exchange coefficient parametrization based on the LES approach is constructed in this paper. To implement this approach, water flow velocities pulsations full-scale data at some points of shallowwater systems obtained using an acoustic Doppler flow meter (ADCP) during expedition studies were filtered using two-stage Kalman algorithm, and averaged, after which the LES approach was applied using subgrid turbulence model. The parametrization of the coefficient of vertical turbulent exchange is used in the wave hydrodynamics mathematical model

Introduction

Vτ n

Conclusion