On the numerical performance of turbulent closure schemes in a 1D lake model

Bogomolov, V.; Stepanenko, V.

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Дата последнего поиска статьи во внешних источниках: 20 мая 2019 г.

Авторы: Bogomolov V., Stepanenko V.
Журнал: IOP Conference Series: Earth and Environmental Science
Том: 211
Номер: 1
Год издания: 2018
Издательство: IOP Publishing
Местоположение издательства: [Bristol, UK], England
Первая страница: 12038
DOI: 10.1088/1755-1315/211/1/012038
Аннотация: The turbulence closure is a crucial part of a lake model. The closures commonly used are different in underlying physics and mathematical properties, leading to contrasting numerical stability and computational efficiency. We tested the performance of the one-dimensional model LAKE using the k − ε closure and Henderson–Sellers turbulence parameterizations, with a convective mixing scheme, in idealized Kato-Phillips experiment and Lake Kuivajärvi (Finland) simulations. Our results demonstrate that k−ε closure allows for a physically realistic solution at timesteps Δt < 450 s, and the convergence of numerical scheme is attained at Δt < 100 s. In contrast, convergence of the lake model scheme using Henderson–Sellers diffusivity is achieved if Δt < 3600 s, resulting in drastic reduction of the lake model runtime as compared to using k − ε parameterization. At the same time, the performance of the model involving both schemes in respect to measurements is similar.
Добавил в систему: Степаненко Виктор Михайлович

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On the numerical performance of turbulent closure schemes in a 1D lake modelстатья Исследовательская статья

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