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首页> 外文期刊>Bulletin of the American Physical Society >APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Spectra of turbulent flow in cumulus cloud
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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Spectra of turbulent flow in cumulus cloud

机译：APS-流体动力学APS部门第70届年会-事件-积云中湍流的光谱

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We have seamlessly simulated evolution of droplets and turbulence for about ten minutes in a small box which is ascending inside the maritime cumulus cloud. Under the prescribed vertical structure of the mean temperature and water vapor mixing ratio and the periodic boundary condition, the turbulence is computed by the DNS and the particles evolve obeying the condensation-evaporation, collision-coalescence with the hydrodynamic interaction, the Reynolds number dependent drag, and the gravitational sedimentation. It is found that the kinetic energy spectrum obeys nearly Kolmogorov spectrum $k^{-5/3}$ while the spectra of the temperature and water vapor mixing ratio are much shallower than $k^{-5/3}$. An explanation of modification of the spectra is explored by examining the droplet number density spectrum $E_n(k,t)$ and the condensation rate spectrum $E_{C_{m d}}(k,t)$.Two spectra are very similar to each other, nearly $k^{1}$ at low wavenumber range and $k^{-alpha}, 1
机译：我们在一个小盒中无缝模拟了约十分钟的液滴和湍流演化，该小盒在海积云内部上升。在规定的平均温度和水蒸气混合比的垂直结构以及周期性边界条件下，通过DNS计算湍流，并且粒子遵循冷凝-蒸发，碰撞-凝聚与水动力相互作用，雷诺数相关的阻力而演化，以及重力沉降。发现动能谱服从Kolmogorov谱$ k ^ {-5/3} $，而温度和水蒸气混合比的谱比$ k ^ {-5/3} $要浅得多。通过检查液滴数密度谱$ E_n（k，t）$和凝结率谱$ E_ {C_ {md}}（k，t）$探索对光谱修改的解释。两个光谱与彼此之间在低波数范围内接近$ k ^ {1} $，在高波数范围内接近$ k ^ {-alpha，1

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