Tilted Convective Plumes in a Rotating Fluid: A Finite Angle between the Buoyancy Force and the Axis of Rotation

旋转流体中的倾斜对流羽流：浮力与旋转轴之间的有限角度

• 批准号: 0116910
• 负责人: Nelson Hogg
• 金额: $ 34.39万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-10-01 至 2006-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0116910&HistoricalAwards=false
• 关键词: Tilted; Convective; Plumes; Rotating; Fluid

SheremetOCE-0116910The shallow water and hydrostatic approximations do not hold for deep convection, implying that the horizontal component of the earth's rotation cannot be neglected. This proposal is to support work to determine how convection in a system where the gravity and rotation vectors are parallel differ from one in which they are not? Preliminary experiments in the latter type of system suggest an eastward advection of the convecting region and general sinking of fluid along a wedge between the directions of gravity and rotation. Two modes of sinking are identified: blobs sink parallel to gravity and leave behind tails parallel to the rotation axis while curtains sink parallel to the rotation axis. Laboratory experiments will be performed to determine the dependence of the characteristics of convection on a three-dimensional parameter space defined by the rotation, the buoyancy flux, and the angle between the rotation and gravity vectors. The PI will also compare the lab results with the output of the MIT model in a hope of verifying one of the many proposed parameterizations present in the model.

浅水和流体静力学的近似对深层对流不成立，这意味着地球自转的水平分量不能被忽视。这个提议是为了支持研究在重力和旋转矢量平行的系统中对流与不平行的系统有何不同？对后一种系统的初步实验表明，对流区向东平流，流体沿重力方向和旋转方向之间的楔子一般下沉。确定了两种下沉模式：斑点平行于重力下沉，留下平行于旋转轴的尾巴，而窗帘平行于旋转轴下沉。将进行实验室实验，以确定对流特性对由旋转、浮力通量和旋转矢量与重力矢量之间的角度定义的三维参数空间的依赖关系。PI还将实验室结果与MIT模型的输出进行比较，希望验证模型中存在的许多提议的参数化之一。