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Stratified flow over asymmetric and double bell-shaped obstacles

机译：非对称双钟形障碍物的分层流动

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We performed experiments on quasi-two-dimensional lee-wave formation behind obstacles towed through a linearly stratified fluid. Initial transient times, amplitudes and wavelengths are measured for five different obstacle shapes at several flow velocities. We found that the wave field is determined primarily by the height and the leeward slope of the obstacle, in agreement with previous works. Differences between measured quantities and predictions of linear theories indicate that nonlinear effects are important in our parameter range. Experiments with a twin obstacle gave surprising results: average wavelengths and amplitudes are systematically lower than that of produced by an isolated obstacle, which we attribute to the dominance of essential nonlinearities such as anomalously strong wave dispersion.
机译：我们对通过线性分层流体拖曳的障碍物后面的准二维回风形成进行了实验。在几种流速下，对五个不同障碍物形状的初始瞬态时间，幅度和波长进行了测量。我们发现，波场主要由障碍物的高度和下风坡度决定，这与以前的工作一致。实测量与线性理论预测之间的差异表明，非线性影响在我们的参数范围内很重要。使用双障碍物进行的实验得出了令人惊讶的结果：平均波长和振幅在系统上低于孤立障碍物产生的波长和振幅，这归因于基本非线性的主导地位，例如异常强的波色散。

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