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首页> 外文会议>International offshore and polar engineering conference;ISOPE-2010 Beijing >Salt Finger Convection under the Effect of Steady Wind Shear
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Salt Finger Convection under the Effect of Steady Wind Shear

机译：稳定风切变作用下的盐指对流

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In oceanographic situations where salt fingers may be an importantmechanism for the transport of heat and salt in the vertical, velocityshears may also be present. Salt finger convection is analogous toBénard convection in that the kinetic energy of the motions is obtainedfrom the potential energy stored in the unstable distribution of astratifying component. On the basis of the thermal analogy it is ofinterest to discover whether salt fingers are converted intotwo-dimensional sheets by the wind shear, and how the vertical fluxesof heat and salt are changed by the wind shear. Salt finger convectionunder the effect of steady wind shear is theoretically examined in thispaper. The evolution of instability developing in the presence of avertical density gradient disturbance and the horizontal Couette flow isconsidered near the onset of salt fingers under a moderate rate of shear.We use velocity as the basic variable and solve the pressure Poissonequation in terms of the associated Green function. Growthcompetition between the longitudinal rolls (LR) and the transverse rolls(TR), whose axes are respectively in the direction parallel to andperpendicular to the Couette flow, is investigated by the weaklynonlinear analysis of coupled-mode equations. The results show thatthe TR mode is characterized in some range of the effective Rayleighnumber, and that the stability is dominated by the LR mode in thesystem.
机译：在海洋环境中，盐指可能是垂直方向传热和盐分的重要机制，也可能存在速度剪切。盐指对流类似于贝纳德对流，其中运动的动能是从存储在分层成分不稳定分布中的势能中获得的。在热模拟的基础上，有趣的是发现是否通过风切变将盐指转化为二维薄片，以及如何通过风切变改变热量和盐的垂直通量。从理论上研究了稳定风切变作用下的盐指对流。考虑在中等剪切速率下，在盐指的开始附近，存在无密度梯度扰动和水平库埃特流动的情况下的不稳定性演化。功能。通过耦合模式方程的弱非线性分析，研究了纵轴（LR）和横轴（TR）之间的增长竞争，纵轴和纵轴的方向分别平行于和垂直于库埃特流动。结果表明，TR模式具有一定的有效瑞利数范围，其稳定性主要由系统中的LR模式决定。

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