We report the experimental observation of a robust horizontal mean flowinduced by internal gravity waves. A wave beam is forced at the lateralboundary of a tank filled with a linearly stratified fluid initially at rest.After a transient regime, a strong jet appears in the wave beam, withhorizontal recirculations outside the wave beam. We present a simple physicalmechanism predicting the growth rate of the mean flow and its initial spatialstructure. We find good agreement with experimental results.
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