扩散对流温盐台阶结构的数值模拟

doi:10.11978/2018028

Abstract

Abstract:

Diffusive convection driven by temperature and salinity is a ubiquitous phenomenon in the mid and high latitudes of the ocean. Numerical simulation of diffusive convection can be used to study small-scale dynamic processes of the ocean. In this study, we analyze the formation mechanism of diffusive convection and establish a two-dimensional cavity model. The governing equation of the model is solved by the finite volume method, and the process of layering phenomenon is simulated numerically. The temporal evolution of temperature and salinity of the flow field is given, and the vortex structure of the velocity field is simulated. The processes of the formation and merging of diffusive convection staircases are analyzed, and a theoretical explanation for mass and energy transport processes is given. In addition, the diffusive convection under different heat flux density is discussed. It is found that the growth rate of diffusive convection staircases increases with the increase of heat flux density, and the cooling from the upper boundary plays an important role in accelerating its growth. The variation of heat flux density does not have a significant impact on the evolution of diffusive convection staircases.

Key words: diffusive convection, numerical simulation, salinity, temperature

Yan XU, Xiangquan LIU, Rengang SONG, Xianrong CEN, Shuangxi GUO, Shengqi ZHOU. Numerical simulation of diffusive convection staircase[J].Journal of Tropical Oceanography, 2019, 38(1): 11-18.

Figures/Tables 9

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References 30

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Numerical simulation of diffusive convection staircase

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