Numerical Simulation of Turbulent Mixing in a Shallow Lake for Periods of Under-Ice Convection

A. A. Smirnovsky; Смирновский А. А.; S. I. Smirnov; Смирнов С. И.; S. P. Bogdanov; Богданов С. Р.; N. I. Pal’shin; Пальшин Н. И.; R. E. Zdorovennov; Здоровеннов Р. Э.; G. E. Zdorovennova; Здоровеннова Г. Э.

doi:10.31857/S0321059623600047

Numerical Simulation of Turbulent Mixing in a Shallow Lake for Periods of Under-Ice Convection

Authors: Smirnovsky A.A.¹^,2, Smirnov S.I.¹, Bogdanov S.P.¹, Pal’shin N.I.¹, Zdorovennov R.E.¹, Zdorovennova G.E.¹
Affiliations:
1. Northern Water Problems Institute, Karelian Research Center, Russian Academy of Sciences, 185000, Petrozavodsk, Republic of Karelia, Russia
2. Peter the Great St. Petersburg Polytechnic University, 195251, Saint-Petersburg, Russia
Issue: Vol 50, No 5 (2023)
Pages: 622-632
Section: ИССЛЕДОВАНИЯ ПРОЦЕССОВ ВЗАИМОДЕЙСТВИЯ СУШИ С АТМОСФЕРОЙ И ГИДРОЛОГИЧЕСКИХ ПОСЛЕДСТВИЙ ИЗМЕНЕНИЯ КЛИМАТА
URL: https://ogarev-online.ru/0321-0596/article/view/140803
DOI: https://doi.org/10.31857/S0321059623600047
EDN: https://elibrary.ru/QVUMIO
ID: 140803

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Abstract
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Abstract

The article presents the results of application of Implicit Large Eddy Simulation method to numerical simulation of under-ice radiatively driven convection, developing in ice-covered water bodies in the moderate zone at the end of freeze-up period. Studies of the radiatively driven convection are of importance because of the role it plays in the temperature regime of lakes and the functioning of lake ecosystems at the end of freeze-up period. The simulation was carried out with the use of the finite-volume software code SINF/Flag-S, developed in SPbPU. The SIMPLEC algorithm with second-order accuracy was used for advancing in time. The discretization of the convective terms was made with the use of QUICK scheme. The results of calculations were used to study variations in the temperature and pulsation velocity components with periodically varying intensity of external energy pumping during the daily cycle. The dissipation of the kinetic energy, background potential energy, and buoyancy flux were evaluated, and changes in these variables during a daily cycle of radiation impact were calculated. The efficiency mixing of water column was evaluated for the period of development of radiatively driven convection in a model domain simulating a small lake covered by ice.

Keywords

Implicit LES, radiatively driven convection, water temperature, turbulent velocity pulsation, background potential energy, buoyancy flux, energy dissipation, mixing efficiency

References

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