Superstructures and turbulent heat and momentum transport in inclined low-Prandtl-number convection

倾斜低普朗特数对流中的上层结构和湍流热量和动量传输

基本信息

项目摘要

The project is devoted to the investigation of the origin and dynamics of the superstructures that develop in inclined turbulent thermal convection in low Prandtl-number fluids. These superstructures are clusters of the thermal plumes that follow the large-scale circulation of the fluid. Within the project, algorithms to identify, extract and analyze the geometrical and physical properties of the superstructures and their temporal evolution are to be developed or advanced. The superstructures will be extracted from the flow fields that will be generated in our direct numerical simulations. The focus here will be on low Prandtl-number fluids, like in liquid metals, and on slender convection cells, where a favourable combination of buoyancy and shear in a tilted thermal convection cell can significantly enhance the heat transfer, compared to the classical Rayleigh-Benard convection without any cell tilt. In particular, we will investigate the contribution of the superstructures to the global heat and momentum transport in the system, which are expressed, respectively, by the Nusselt and Reynolds numbers. Furthermore, the influence on the superstructures dynamics of the control parameters, such as the Rayleigh number, Prandtl number, convection cell length ratios and the angle of inclination, will be studied. Finally, the relationship between the local heat transport (Nusselt number) and the instantaneous form of the superstructure will be investigated.
该项目致力于研究低普朗特数流体中倾斜湍流热对流中发展的超结构的起源和动力学。这些超结构是跟随大规模流体循环的热羽流的集群。在该项目中,将开发或改进识别、提取和分析上层建筑的几何和物理特性及其时间演变的算法。超结构将从我们的直接数值模拟中产生的流场中提取。这里的重点将是低普朗特数的流体,如在液体金属,和细长的对流细胞,在一个倾斜的热对流细胞的浮力和剪切的有利组合可以显着提高传热相比,经典的瑞利-贝纳德对流没有任何细胞倾斜。特别是,我们将调查的贡献的超级结构的全球热量和动量输运系统中,这是表示,分别由努塞尔数和雷诺数。此外,控制参数,如瑞利数,普朗特数,对流细胞的长度比和倾斜角度的上层结构动力学的影响,将被研究。最后,局部热输运(努塞尔数)和瞬时形式的上层建筑之间的关系将进行调查。

项目成果

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Privatdozentin Dr. Olga Shishkina其他文献

Privatdozentin Dr. Olga Shishkina的其他文献

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{{ truncateString('Privatdozentin Dr. Olga Shishkina', 18)}}的其他基金

Flow structure and heat transport in low Prandtl-number vertical convection
低普朗特数垂直对流中的流动结构和传热
  • 批准号:
    437046649
  • 财政年份:
    2019
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Numerical study of heat and momentum transport in horizontal convection at large Rayleigh numbers
大瑞利数水平对流热和动量传输的数值研究
  • 批准号:
    392375701
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Rotating turbulent thermal convection at large Rayleigh numbers
大瑞利数下的旋转湍流热对流
  • 批准号:
    324106305
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Turbulent thermal convection: phenomenon and applications
湍流热对流:现象与应用
  • 批准号:
    249109995
  • 财政年份:
    2014
  • 资助金额:
    --
  • 项目类别:
    Heisenberg Fellowships
The effect of wall roughness on heat transport in turbulent natural thermal convection
壁面粗糙度对湍流自然热对流传热的影响
  • 批准号:
    191894326
  • 财政年份:
    2010
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Hochaufgelöste numerische Simulationen von turbulenter nicht-Oberbeck-Boussinesq Rayleigh-Bénard Konvektion
湍流非 Oberbeck-Boussinesq Rayleigh-Bénard 对流的高分辨率数值模拟
  • 批准号:
    144426649
  • 财政年份:
    2009
  • 资助金额:
    --
  • 项目类别:
    Research Grants
From wall modes to the boundary zonal flow in confined rotating thermal convection
从壁模到受限旋转热对流中的边界层流
  • 批准号:
    526242382
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Internally heated convection
内部加热对流
  • 批准号:
    499364797
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Research Grants

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