The flow structure in a laboratory model of atmospheric general circulation
A.Y. Vasiliev,
E.N. Popova,
A.N. Sukhanovskii
Abstract:Представлены первые результаты математического моделирования в постановке, приближенной к новой лабораторной модели общей циркуляции атмосферы. Рассматривается вращающийся слой жидкости с малым аспектным отношением при наличии локализованного кольцевого нагревателя, расположенного на периферии дна, и холодильника в форме диска, который находится в центральной части верхней границы слоя. Кольцевой нагреватель имитирует нагрев в области экватора, а холодильникохлаждение в полярной области. Нагревате ль отодвинут … Show more
“…An effective way to solve this problem is numerical simulation using a digital "twin" of the laboratory model. This has already been demonstrated with the mathematical model implemented by the freely distributed computational fluid dynamics package OpenFOAM v2106 (Vasiliev et al, 2023). In the present study, 125 the mathematical model of the laboratory system implemented by the in-house CFD code σFlow was used for numerical simulations.…”
Section: Numerical Simulationmentioning
confidence: 80%
“…A detailed description of the laboratory model of general atmosphere circulation is given in (Sukhanovskii et al, 2023;Vasiliev et al, 2023). The experimental model is a rectangular tank of a square cross-section with a side L = 700 mm, and height H = 200 mm (figure 2).…”
Section: Methodsmentioning
confidence: 99%
“…It is unclear whether this scenario is a robust and intrinsic feature of baroclinic waves in rotating tanks with horizontal temperature difference or a specific feature of a particular laboratory realization in the annulus configuration. In order to resolve this issue, we conducted a series of experiments and numerical simulations for the Arctic warming scenario in the dishpan configuration (Sukhanovskii et al, 2023;Vasiliev et al, 2023). The combined laboratory and numerical approach allow to reveal qualitative and quantitative aspects of the complex system under consideration.…”
mentioning
confidence: 99%
“…Boundary conditions of the second type (constant heat flux) are chosen because they are more realistic for the atmosphere. This configuration allows one to realize a variety of flow regimes from axisymmetric to highly irregular (Sukhanovskii et al, 2023;Vasiliev et al, 2023). Motivated by the problem of Arctic warming we examine how central cooling affects the structure and characteristics of the flow, which is similar to the typical atmospheric circulation.…”
Abstract. The results of experimental and numerical modeling of Arctic warming in a laboratory dishpan configuration are presented. The Arctic warming is reproduced by varying the size of a local cooler in the "atmospheric" regime, in which the flow structure is similar to the general atmospheric circulation. It is shown that a significant variation in cooling power and boundary (slip and non-slip) conditions leads to quantitative changes in the structure and intensity of baroclinic waves. The size of the cooler and boundary conditions applied to its surface play a crucial role in the structure and intensity of circulation at small radii. The laboratory Arctic warming leads to a weakening of a polar cell analog and mean zonal flows. The most important result of this study is a noticeable transformation of the mean temperature field. Namely, the central region and most of the lower layer become warmer, while most of the upper layer and the peripheral (equatorial) part of the lower layer become colder. The nature of this phenomenon is closely related to the changes in radial heat fluxes. Laboratory Arctic warming leads to a significant decrease in the negative heat flux near the bottom, which inevitably leads to an increase in temperature. Our results provide a plausible explanation for Arctic warming amplification.
“…An effective way to solve this problem is numerical simulation using a digital "twin" of the laboratory model. This has already been demonstrated with the mathematical model implemented by the freely distributed computational fluid dynamics package OpenFOAM v2106 (Vasiliev et al, 2023). In the present study, 125 the mathematical model of the laboratory system implemented by the in-house CFD code σFlow was used for numerical simulations.…”
Section: Numerical Simulationmentioning
confidence: 80%
“…A detailed description of the laboratory model of general atmosphere circulation is given in (Sukhanovskii et al, 2023;Vasiliev et al, 2023). The experimental model is a rectangular tank of a square cross-section with a side L = 700 mm, and height H = 200 mm (figure 2).…”
Section: Methodsmentioning
confidence: 99%
“…It is unclear whether this scenario is a robust and intrinsic feature of baroclinic waves in rotating tanks with horizontal temperature difference or a specific feature of a particular laboratory realization in the annulus configuration. In order to resolve this issue, we conducted a series of experiments and numerical simulations for the Arctic warming scenario in the dishpan configuration (Sukhanovskii et al, 2023;Vasiliev et al, 2023). The combined laboratory and numerical approach allow to reveal qualitative and quantitative aspects of the complex system under consideration.…”
mentioning
confidence: 99%
“…Boundary conditions of the second type (constant heat flux) are chosen because they are more realistic for the atmosphere. This configuration allows one to realize a variety of flow regimes from axisymmetric to highly irregular (Sukhanovskii et al, 2023;Vasiliev et al, 2023). Motivated by the problem of Arctic warming we examine how central cooling affects the structure and characteristics of the flow, which is similar to the typical atmospheric circulation.…”
Abstract. The results of experimental and numerical modeling of Arctic warming in a laboratory dishpan configuration are presented. The Arctic warming is reproduced by varying the size of a local cooler in the "atmospheric" regime, in which the flow structure is similar to the general atmospheric circulation. It is shown that a significant variation in cooling power and boundary (slip and non-slip) conditions leads to quantitative changes in the structure and intensity of baroclinic waves. The size of the cooler and boundary conditions applied to its surface play a crucial role in the structure and intensity of circulation at small radii. The laboratory Arctic warming leads to a weakening of a polar cell analog and mean zonal flows. The most important result of this study is a noticeable transformation of the mean temperature field. Namely, the central region and most of the lower layer become warmer, while most of the upper layer and the peripheral (equatorial) part of the lower layer become colder. The nature of this phenomenon is closely related to the changes in radial heat fluxes. Laboratory Arctic warming leads to a significant decrease in the negative heat flux near the bottom, which inevitably leads to an increase in temperature. Our results provide a plausible explanation for Arctic warming amplification.
Abstract. The results of experimental and numerical modeling of Arctic warming in a laboratory dishpan configuration are presented. The Arctic warming is reproduced by varying the size of a local cooler in the “atmospheric” regime, in which the flow structure is similar to the general atmospheric circulation. The laboratory Arctic warming results in a relatively weak response of the meridional and zonal circulation except in the polar region, where the polar-cell analog becomes weaker, shifts closer to the middle radii, and is mainly located in the upper layer. The structure of analogs of Hadley and Ferrel cells is the same for all considered configurations. The decrease in the velocity of the zonal flow (analog of westerly wind) and the change in baroclinic wave activity at laboratory middle latitudes was less than 10 %. The most important result of this study is a noticeable transformation of the mean temperature field. Namely, the central region and most of the lower layer become warmer, while most of the upper layer and the peripheral (equatorial) part of the lower layer become colder. The nature of this phenomenon is closely related to the changes in radial heat fluxes. The weakening and upward shift in the polar-cell analog caused by laboratory Arctic warming provides a significant reduction in the negative heat flux near the bottom. This inevitably leads to a temperature increase in the bottom layer. It is also shown that Ekman pumping due to non-slip boundary conditions at the surface of the cooler has a strong influence on the structure and intensity of the polar-cell analog.
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