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Rodrigues S.,National Laboratory for Civil Engineering | Nascimento M.F.,Centro Estadual Universitario da Zona Oeste | Fonseca N.,University of Lisbon | Santos J.A.,Polytechnic Institute of Lisbon | Neves C.F.,Federal University of Rio de Janeiro
Computational Methods in Marine Engineering V - Proceedings of the 5th International Conference on Computational Methods in Marine Engineering, MARINE 2013 | Year: 2013

This paper presents the results for the two additional pressure distribution functions included in the modified model FUNWAVE to simulate the propagation of waves generated by ships, where the ship is represented by a pressure distribution function. This modified model was adapted by Nascimento [1] in order to include a specified moving pressure at the free surface where the most of the phenomena involved in the transformation of the wave are reproduced. The value proposed by Nascimento [1] for the maximum value of the pressure distribution function of Li and Sclavounos [6] was used as reference in the two new pressure distribution functions.

Moreira R.M.,Federal University of Fluminense | Chacaltana J.T.A.,Federal University of Espirito Santo | Santos J.A.,Polytechnic Institute of Lisbon | Rodrigues S.R.A.,University of Lisbon | And 2 more authors.
Maritime Technology and Engineering - Proceedings of MARTECH 2014: 2nd International Conference on Maritime Technology and Engineering | Year: 2015

Pressure disturbance waves are computed via a fully nonlinear, unsteady, boundary integral formulation for various Froude and Bond numbers. Three moving pressure distributions are introduced in the numerical model to evaluate the produced near and far-field wave patterns in a channel. For Froude numbers equal to one, classical runaway solitons are obtained on the fore of the moving pressure patch whereas “stern” waves are radiated away. “Step-like” pressure distributions give different responses to the free-surface flow, with upward breaker jets and steeper “stern” waves. For supercritical and subcritical flows, steady solitons and stationary trenches moving at the same speed of the pressure distribution are obtained, respectively. Surface tension affects directly the free-surface flow: runaway solitons are suppressed; instead, a “building-up plateau” and a capillary wavetrain are formed ahead and on the rear of the moving pressure patch for long computational run-times. For supercritical flows, small-scale ripples and parasitic capillaries appear on the fore of the steady soliton; oppositely, for low Froude numbers, stationary trenches become shallower compared to the corresponding pure-gravity wave solutions. Nonlinear results show that near and far-field wave patterns are significantly affected by moving pressure distributions and surface tension. © 2015 Taylor & Francis Group, London.

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