舟山特定海域三维水流数值模拟研究

Three-dimensional numerical simulation of Zhoushan area

舟山海域为长江径流水体南下的必经之路,该海域的水动力条件受周围地形、长江径流以及杭州湾-东海潮流的综合影响,极具特殊性。针对目前缺少特定海域模拟分析的情况,对舟山岛南部至宁波穿山半岛之间特定海域进行了研究。通过建立该海域三维网格模型,结合ADCP走航实验获取实际流速数据,使用Fluent软件进行了数值模拟,以获得该海域流速模型。并在此基础上,对所得模型中流速较大的海域进行了分析研究。研究结果表明:涨潮时,螺头水道最高流速为1.6 m/s^2.1 m/s,出现在摘箬山岛及小猫山南部海域;退潮时,最高流速为1.5 m/s^2.1 m/s,出现在宁波穿山半岛的北侧及螺头水道东段出口边界处,并在宁波穿山半岛北部发现存在近岸"回流"。通过该模型可获得舟山海域实际流速,对于工程应用具有一定的参考价值。

Zhoushan area is the only way of changjiang runoff, which flow from north to south. The hydrodynamic condition of this sea area is affected by the changjiang runoff, the power flow of Hangzhou Bay-the east china sea and complex terrain, which is particular and significant. Aiming at the shortage of simulation for specific sea area, the research on the southern part of the Zhoushan island to the Ningbo Chuanshan peninsula was carried out. The three-dimensional structure grid was established, combined with the practical data of flow rate by ADCP experiment, the flow model of this sea area was obtained by conducting a numerical simulation by using Fluent. On the basis of these experiments, the sea area with large velocity was analyzed. The results show that, when raising tide, the maximum velocity of Luotou channel, which is 1.6 m/s-2.1 m/s, is present in the south of Zhaoluoshan Island and Xiaomao Island; the maximum velocity,which is 1.5 m/s-2.1 m/s when ebbing tide,is present to export boundary on the north side of Ningbo Chuanshan peninsula and the east of Zhoushan Island, the return flows are discovered in the Ningbo Chuanshan peninsula. The obtained data is identical with measured data, the model has a certain reference value for engineering application.