Turbulent Boundary Layers
Turbulent Boundary Layers
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湍流边界层
DOI：
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发表时间：
1968
影响因子：
1.4
通讯作者：
Peter Bradshaw
中科院分区：
文献类型：
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作者：
Peter Bradshaw
在这次演讲中，我希望把湍流研究的两个分支结合在一起，(1)湍流的物理和数学的基础研究和(2)飞机设计者和其他流体动力学家使用的计算湍流发展的方法。虽然飞机设计者希望在不深入研究控制湍流边界层发展的物理过程的情况下预测湍流边界层的行为，这是完全合理的，但那些首先开发计算方法的人应该忽视流动的物理特性，或者用出于数学方便而不是物理合理性而选择的简单公式来表示它，这是完全合理的。湍流不是一个简单的现象！直到几年前还很流行的更幼稚的积分方法已经被汤普森一劳永逸地抛弃了。从汤普森的评论中出现的唯一值得信赖的方法是Head的夹带法，它与大多数其他积分方法的不同之处在于它基于关于湍流的明确物理假设。海德本人认为这一假设是一种非常粗略的尝试，试图代表湍流的卷吸特性，实际上很容易看出，这种假设在一些更困难的情况下肯定是失败的。
In this lecture I hope to bring together the two branches of turbulence studies, (1) the fundamental study of the physics and mathematics of turbulent flow and (2) the methods of calculating turbulent flow development which are used by aircraft designers and other fluid dynamicists. While it is entirely reasonable that aircraft designers should wish to predict the behaviour of turbulent boundary layers without going deeply into the physical processes which govern their development, it is by no means reasonable that those who develop calculation methods in the first place should ignore the physics of the flow, or represent it by simple-minded formulae chosen for mathematical convenience rather than physical plausibility. Turbulence is not a simple phenomenon! The more naive integral methods that were in vogue until a few years ago have been disposed of once and for all by Thompson. The only method that emerged from Thompson’s review with any credit was Head’s entrainment method, which was distinguished from most of the other integral methods by being based on a clear physical hypothesis about turbulent flow. Head himself regarded this hypothesis as a very crude attempt to represent the entrainment properties of the turbulence, and indeed it is easy to see that this sort of hypothesis must fail in some of the more difficult situations.