The effect of large surface waves riding over depth-varying currents.

What is it about?

Water waves with a shearing current beneath them can generate structures in the form of recirculation zones. These recirculation zones travel with the wave speed and could, for example, transport pollutants for a certain distance. In this article the authors illustrate computationally issues on stagnation points and critical layers for which theoreticians have answers but not yet a complete understanding.

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Why is it important?

The numerical method enables finding with great precision the location of all the stagnation points related to the traveling rotational surface wave. With equal precision one finds the location of an anomalous pressure values.