Abstract
Abstract A horizontal cylinder is traversed horizontally normal to its longitudinal axis in density stratified brine, and the lee waves which are produced over a range of model velocities are viewed with a six mirror Mach Zehnder interferometer which allows the density distribution to be evaluated. At the lowest model velocities, viscous effects limit the number of visible waves to no more than three. The viscous internal wave theory of Chang and Stevenson is extended and used to calculate lee waves over a ridge. Although the linear theory does not include the no-slip condition at the lower boundary and does not include the upstream wake, which is clearly visible in the experiments, the way in which the waves attenuate away from the model is reproduced quite well by the theory. The viscous results will be compared with the standard inviscid calculations.
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