【摘要】：采用流體體積(VOF)方法捕捉自由表面,結(jié)合有限差分方法求解N-S(Navier-Stokes)方程、k-ε模型封閉,建立數(shù)值模型,并使用該模型模擬非平底地形條件下畸形波的生成。采用小波分析方法計算模擬結(jié)果的時頻能量譜,基于計算結(jié)果分析非平底地形對畸形波能量集中程度和高頻能量的影響。主要結(jié)論為:坡度小于1∶10的斜坡地形和無量綱水深變化小于0.333的曲線地形對畸形波時頻能量譜的影響不顯著;坡度大于1∶10的斜坡地形和無量綱水深變化大于0.333的曲線地形會顯著影響畸形波的時頻能量譜,隨著坡度和無量綱水深變化的增加,時頻能量譜中畸形波發(fā)生時刻附近,能量向高頻方向移動,使得能量在高頻端的分布范圍增大,時頻譜密度峰值減小;斜坡和曲線地形的特征變化對于畸形波能量集中度參數(shù)的影響不顯著。
[Abstract]:The free surface is captured by the (VOF) method of fluid volume, the N-S (Navier-Stokes) equation is solved by the finite difference method, the k- 蔚 model is closed, and the numerical model is established. The model is used to simulate the generation of deformable waves under the condition of non-flat bottom terrain. The time-frequency energy spectrum of the simulation results is calculated by wavelet analysis method. Based on the calculation results, the influence of non-flat bottom topography on the energy concentration of the deformity wave and the high frequency energy is analyzed. The main conclusions are as follows: slope topography with slope less than 1:10 and curve topography with dimensionless water depth change less than 0.333 have no significant effect on time-frequency energy spectrum of deformities; The slope topography with slope degree greater than 1:10 and the curve terrain with dimensionless water depth change greater than 0.333 will significantly affect the time-frequency energy spectrum of the abnormal wave. With the increase of slope and dimensionless water depth variation, the time of occurrence of the abnormal wave in the time-frequency energy spectrum is near. When the energy moves to the high frequency direction, the distribution range of the energy in the high frequency end increases and the peak value of the time spectrum density decreases. The effects of slope and curve topography on the energy concentration of deformities are not significant.
【作者單位】： 交通運輸部天津水運工程科學研究所;港口水工建筑技術(shù)國家工程實驗室;
【基金】：國家自然科學基金項目——量化分析三維畸形波內(nèi)部結(jié)構(gòu)(51509120)
【分類號】：P731.2

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