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Simulation of irregular waves in a numerical wave tank

Li Z-F., Shi Y. Y., Ren H. L., Li H., Ashraf M. A.

Polish Maritime Research

2015

S 1

21--25

The time domain boundary element method was utilized to simulate the propagation of the irregular waves in a numerical wave tank. The problem was solved in a time-marching scheme, upon the irregular waves being fed through the inflow boundary, in which the theoretical solution was obtained from the wave energy spectrum. The open boundary condition was modeled by the multi transmitting formula (MTF), in which the phase velocity was calculated according to the Sommerfeld’s condition. The velocity potential and wave elevation were directly obtained by integrating the free surface condition twice, with respect to time. The accuracy of the developed numerical scheme was verified by simulating the propagation of irregular waves. The numerical results show good agreements with the analytical solutions, which prove that the proposed scheme is a promising way to the simulation of wave-body interactions.

Analysis on Wave Forces Acting on Box Girder of Twin-Decks Offshore Bridge

Zhang X., Zhou H., Wang H., Gao K.

Przegląd Elektrotechniczny

2012

R. 88, nr 9b

29-32

Based on the practice twin-decks bridge and model test, and considering different deck elevation and the different wave factor, the wave loads of various models were simulated using the 2D numerical wave tank, and compare with the corresponding experimental values and theoretical values. All the wave forces have the tendency to decrease after they reach the maximum with the increase of bridge elevation, and there exists the most dangerous bridge elevation under wave action. The optimum elevation of the bridge deck in this paper is recommended +5.5~+6.0 m.

W artykule analizowano siły działające na skutek ruchu fal na dźwigar mostu morskiego dwupoziomowego. Do symulacji wykorzystano metody numeryczne i określono najbardziej niebezpieczne wyniesienie mostu.