Collaborative Research: The role of microphysical processes and turbulence intermittency in droplet coalescence in warm cumulus clouds
合作研究:微物理过程和湍流间歇性在暖积云中液滴合并中的作用
基本信息
- 批准号:1435953
- 负责人:
- 金额:$ 24.74万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2014
- 资助国家:美国
- 起止时间:2014-09-01 至 2017-08-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
PI: Rani, Sarma L. /Koch, Donald L. Proposal Number: 1436100 / 1435953The goal of the proposed study is to explore the formation of droplets and the production of rain from a cumulus cloud. This is a topic relevant for the prediction of rainfall and of hazards such as tornados and flash flooding. Warm cumulus clouds exert significant influence on the climate system of the earth by processing atmospheric aerosols, interacting with electromagnetic radiation from the sun and earth, and redistributing earth's water and energy through the hydrologic cycle. This study addresses two central outstanding questions in the current understanding of warm rain production, namely, the mechanisms leading to the formation of fast-growing 'statistically fortunate' drops, and the growth of the cloud droplets, both of which hasten the 'colloidal instability' of the cloud, resulting in precipitation. To understand the effects of turbulence, it is essential to gain insights into the interactions between large-scale processes such as turbulent entrainment, mixing and intermittency, and microscale processes such as particle clustering, droplet relative velocities and collision efficiency. In terms of outreach and education, it is proposed to involve graduate and undergraduate students in interdisciplinary research at the confluence of turbulence, cloud and particle physics. The PIs plan to reach out to students at Alabama A&M University and Huntsville High School to encourage the students to pursue undergraduate and/or graduate degrees in STEM-related fields.The collaborating PIs will conduct a multiscale investigation, in which a Large Eddy Simulation (LES) will be used to model the whole cloud and to feed energy to a Direct Numerical Simulation (DNS) model, in order to explain how very small droplets appear and grow in size within a cloud. The hypothesis is that intermittency in turbulent shear and flow acceleration are driving the formation and the coalescence of the droplets. The proposed work is for high Reynolds number cloud turbulence at practical scales. Using the proposed energy transfer method, inertial-range LES turbulence intermittency information will be included in the DNS. The theoretical research will focus on developing stochastic models for both microscale and macroscale cloud physics including: 1) Detailed microscale models for the local flow field in the vicinity of bidisperse interacting drops with statistical properties characteristic of cloud Reynolds numbers; 2) Effects of particle inertia and differential sedimentation on the stochastic flow field ?seen? by the drops; 3) Effects of non-continuum, van der Waals and electrostatic interactions between drops on their collision efficiency; and 4) Macroscale model that accounts for the effects of turbulence intermittency and eddy mixing on the stochastic kinetics of droplet growth. The proposed research is expected to shed light on aerosol-cloud interactions that are important in generating precipitation and in affecting climate patterns.
主要研究者:拉尼,Sarma L.作者:Koch,Donald L.提案编号:1436100 /1435953拟议研究的目标是探索水滴的形成和积云降雨的产生。这是一个与预测降雨和龙卷风、山洪等灾害有关的主题。暖积云通过处理大气气溶胶,与来自太阳和地球的电磁辐射相互作用,并通过水文循环重新分配地球的水和能量,对地球的气候系统产生重要影响。这项研究解决了两个中心突出的问题,在目前的理解暖雨生产,即,机制导致形成快速增长的“统计上幸运”的下降,和云滴的增长,这两者都加速了“胶体不稳定”的云,导致降水。为了理解湍流的影响,必须深入了解大尺度过程(如湍流卷吸、混合和湍流)与微尺度过程(如颗粒聚集、液滴相对速度和碰撞效率)之间的相互作用。在外联和教育方面,建议让研究生和本科生参与湍流、云和粒子物理学交汇处的跨学科研究。研究所计划接触亚拉巴马农工大学和亨茨维尔高中的学生,鼓励他们攻读STEM相关领域的本科和/或研究生学位。合作的研究所将进行多尺度调查,其中大涡模拟(LES)将用于模拟整个云,并将能量输入直接数值模拟(DNS)模型,以解释非常小的液滴如何在云中出现和尺寸增长。假设是湍流剪切和流动加速中的不稳定性驱动液滴的形成和聚结。建议的工作是高雷诺数云湍流在实际尺度。使用所提出的能量传递方法,惯性范围LES湍流不稳定性信息将被包括在DNS中。理论研究将集中于发展微尺度和大尺度云物理的随机模型,包括:1)具有云雷诺数统计特性的双分散相互作用液滴附近局部流场的详细微尺度模型; 2)颗粒惯性和差异沉降对随机流场的影响?看见了吗?滴,3)液滴之间的非连续、货车德瓦耳斯和静电相互作用对它们的碰撞效率的影响;以及4)宏观尺度模型,该模型解释了湍流不稳定性和涡流混合对液滴生长的随机动力学的影响。拟议的研究有望阐明气溶胶-云的相互作用,这对产生降水和影响气候模式至关重要。
项目成果
期刊论文数量(2)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
A stochastic model for the relative motion of high Stokes number particles in isotropic turbulence
- DOI:10.1017/jfm.2014.461
- 发表时间:2014-09
- 期刊:
- 影响因子:3.7
- 作者:S. Rani;R. Dhariwal;D. Koch
- 通讯作者:S. Rani;R. Dhariwal;D. Koch
Stochastic theory and direct numerical simulations of the relative motion of high-inertia particle pairs in isotropic turbulence
各向同性湍流中高惯性粒子对相对运动的随机理论和直接数值模拟
- DOI:10.1017/jfm.2016.859
- 发表时间:2017
- 期刊:
- 影响因子:3.7
- 作者:Dhariwal, Rohit;Rani, Sarma L.;Koch, Donald L.
- 通讯作者:Koch, Donald L.
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Donald Koch其他文献
Donald Koch的其他文献
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{{ truncateString('Donald Koch', 18)}}的其他基金
Slender body theory and finite difference computations to characterize particle-fluid interactions at moderate Reynolds numbers
细长体理论和有限差分计算来表征中等雷诺数下的颗粒-流体相互作用
- 批准号:
2206851 - 财政年份:2022
- 资助金额:
$ 24.74万 - 项目类别:
Standard Grant
The Effect of Particle-polymer Interactions on the Rheology and Structure of Dilute Particle-filled Polymeric Liquids
颗粒-聚合物相互作用对稀颗粒填充聚合物液体流变学和结构的影响
- 批准号:
1803156 - 财政年份:2018
- 资助金额:
$ 24.74万 - 项目类别:
Standard Grant
UNS: Employing hydrodynamic lift and particle trajectory ratcheting to achieve sieve-free separations based on size and shape in cross-flow filtration
UNS:利用流体动力升力和颗粒轨迹棘轮,在错流过滤中根据尺寸和形状实现无筛分离
- 批准号:
1505795 - 财政年份:2015
- 资助金额:
$ 24.74万 - 项目类别:
Standard Grant
Using shape to control the orientations and positions of particles in processing flows
使用形状来控制处理流程中颗粒的方向和位置
- 批准号:
1435013 - 财政年份:2014
- 资助金额:
$ 24.74万 - 项目类别:
Standard Grant
Hydrodynamic instabilities and flow modification caused by preferential concentration of inertial particles
惯性颗粒优先集中引起的水动力不稳定性和流动改变
- 批准号:
1233793 - 财政年份:2012
- 资助金额:
$ 24.74万 - 项目类别:
Standard Grant
Hydrodynamically Assisted Bacterial Chemotaxis
流体动力学辅助细菌趋化作用
- 批准号:
1066193 - 财政年份:2011
- 资助金额:
$ 24.74万 - 项目类别:
Standard Grant
Collective Hydrodynamics of Swimming Bacteria: A Living Fluid
游动细菌的集体流体动力学:一种活体液体
- 批准号:
0730579 - 财政年份:2007
- 资助金额:
$ 24.74万 - 项目类别:
Continuing Grant
The Effects of Fluid-Particle and Particle-Particle Interactions on the Structure and Flow Properties of Suspensions of Fibers and Disks
流体-颗粒和颗粒-颗粒相互作用对纤维和圆盘悬浮液结构和流动性能的影响
- 批准号:
0332902 - 财政年份:2004
- 资助金额:
$ 24.74万 - 项目类别:
Standard Grant
Nonlinear-Flow-Induced Structure in Fiber Suspensions
纤维悬浮液中的非线性流动诱导结构
- 批准号:
9910908 - 财政年份:2000
- 资助金额:
$ 24.74万 - 项目类别:
Continuing Grant
Fluid Flow, Pressure Drop, and Heat and Mass Transfer in Packed Beds at Moderate Reynolds Numbers
中等雷诺数下填充床中的流体流动、压降以及传热传质
- 批准号:
9526149 - 财政年份:1996
- 资助金额:
$ 24.74万 - 项目类别:
Continuing Grant
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Research on Quantum Field Theory without a Lagrangian Description
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