A 2D Smoothed Particles Hydrodynamics (SPH) code has been developed at INSEAN and applications to the breaking-dam problem have been described at a previous NuTTS, Colagrossi et al. (2001), and expanded in Colicchio et al. (2002). Landrini et al. (2003) applied INSEAN's SPH code to sloshing. Colagrossi and Landrini (2003), Landrini et al (2003) give details of the theory. The described SPH method is rather robust (even for large free-surface fragmentations and folding), efficient and simple to code. CPU times are comparable to other techniques capable of modeling breaking waves. The SPH technique studies the fluid flow as the movement of fluid particles, which have their own mass, density, velocity, and pressure. Each particle is influenced in its evolution by the evolution of the neighbor particles. Consequently, the characteristics of the particles are estimated through interpolation equations, which are weighted sums of the characteristics of the nearby particles. These equations are governed by a kernel function W which assigns its weight in the sum to each particle involved in the computation of a given property. We use a Gaussian kernel function with cut-off limit of 3h. Fig. l explains how a Gaussian kernel of length h influences the computations of the properties of the particle centered on x~*.
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