TY - EJOU AU - Wang, Jinghua AU - Yan, S AU - Ma, Q.W. TI - An Improved Technique to Generate RogueWaves in Random Sea T2 - Computer Modeling in Engineering \& Sciences PY - 2015 VL - 106 IS - 4 SN - 1526-1506 AB - This paper presents an improved technique to generate rogue (freak) waves embedded in random sea based on the approach proposed by Kribel and Alsina (2000). In this method, a part of the wave energy is focused using the temporal-spatial focusing approach to generate an extreme transient wave and the rest behaves randomly. By introducing a correction term, the improved technique removes the numerical.ly spurious fluctuations of the spectra in the existing approach. Various effects of the correction are investigated numerically by using the second-order wave theory and two existing numerical. methods based on the fully nonlinear potential theory (FNPT), including the improved Spectral Boundary Integral (SBI) method and the Quasi Arbitrary Lagrangian- Eulerian Finite Element Method (QALE-FEM). The discussions are mainly focused on (1) the effectiveness of the correction on retaining the features of the specified wave spectrum; and (2) the effects of the correction on the probability of the maximum wave heights. KW - Rogue waves KW - random sea KW - 2nd order wave theory KW - FNPT KW - improved SBI KW - QALE-FEM DO - 10.3970/cmes.2015.106.263