| 引用本文: | 朱旭芳,颜冰,马知远.浅海舰船地震波场仿真中的边界处理.[J].国防科技大学学报,2018,40(2):85-90.[点击复制] |
| ZHU Xufang,YAN Bing,MA Zhiyuan.Boundary disposing method of ship seismic wave field simulation in shallow sea[J].Journal of National University of Defense Technology,2018,40(2):85-90[点击复制] |
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| 浅海舰船地震波场仿真中的边界处理 |
| 朱旭芳1, 颜冰2, 马知远1 |
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(1. 海军工程大学 电子工程学院， 湖北 武汉 430033;2. 海军工程大学 兵器工程系， 湖北 武汉 430033)
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| 摘要: |
| 为解决舰船地震波场数值仿真中的边界反射问题，结合浅海传播环境特征和舰船地震波激发机理，提出边界处理算法。采用交错网格有限差分法对一阶速度-应力方程进行数值离散；采用应力镜像法处理海水和空气的自由表面，采用分裂式完全匹配层法处理区域边界；将该模型应用于平行海底近场、远场以及倾斜海底的波场仿真算例中。仿真结果表明：加入边界处理后，自由表面的吸收和区域边界的反射有效减少，波场特征清晰，该算法符合浅海舰船地震波场数值仿真的边界处理要求。 |
| 关键词: 浅海 舰船地震波 有限差分 自由边界 吸收边界 |
| DOI：10.11887/j.cn.201802014 |
| 投稿日期：2016-12-21 |
| 基金项目:国家部委基金资助项目(20160354) |
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| Boundary disposing method of ship seismic wave field simulation in shallow sea |
| ZHU Xufang1, YAN Bing2, MA Zhiyuan1 |
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(1. College of Electronics Engineering, Naval University of Engineering, Wuhan 430033, China;2. Department of Weaponry Engineering, Naval University of Engineering, Wuhan 430033, China)
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| Abstract: |
| The stress image method and the perfect matching layer method were used to deal with the boundary problem of shallow water ship seismic wave field simulation. The algorithm fully considers the shallow water environment and the excitation mechanism of the seismic wave. Based on the first-order velocity-stress equation, staggered grid finite difference method was taken to discretize the equations. The stress mirror method was applied to deal with free surface of seawater and air. The split boundary perfectly matched layer method was applied to deal with the boundary of the computing area. The parallel and inclined seafloor seismic wave fields were computed. The results before and after were compared, which shows that if the boundary is not treated, serious reflection would cover up the original wave field characteristics, but after the treatment, each case of wave field wave line and wave propagation rules are quite clear. So this method completely conforms to the shallow water ship seismic wave field numerical simulation requirements. |
| Keywords: shallow sea ship seismic wave finite difference free boundary absorbing boundary |
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