High Quality Content by WIKIPEDIA articles! In fluid dynamics, the Ursell number indicates the nonlinearity of long surface gravity waves on a fluid layer. This dimensionless parameter is named after Fritz Ursell, who discussed its significance in 1953.The Ursell number is derived from the Stokes' perturbation series for nonlinear periodic waves, in the long-wave limit of shallow water when the wavelength is much larger than the water depth. Then the Ursell number U is defined as:
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