人工鱼礁是海洋牧场的重要组成部分，对于修复海洋生态环境、提高渔获量有重要价值。人工鱼礁的投放可以使得鱼礁周围流场发生变化，对于鱼类摄食、庇护都有重要的影响。本研究对人工鱼礁的水动力学特性进行研究，采用计算流体动力学软件Fluent和基于N-S方程对组合式金字塔型人工鱼礁的流场进行分析。比较了4种流速（0.1、0.2、0.3和0.4 m/s）下鱼礁流场的变化情况，得到了周围涡量和压力的分布特征，给出了该型人工鱼礁的三维紊流区，并同其他类型人工鱼礁进行了对比。结果显示：涡量主要分布于导流盘后方区域，且越远离导流盘的地方涡量越弱；不同来流速度下，上升流的最大高度约为鱼礁高度的1.53倍，鱼礁涡量区的高度约为鱼礁的高度，背涡区的长度随着水流速度的增加而增加；不同流速下，紊流区的范围与大小基本不变。

 Artificial reef is an important part of marine ranching, which is of great value for the restoration of marine ecological environment and the improvement of fish catch. Placement of artificial reef can make the flow field around change, which has an important impact on fish feeding and sheltering. This paper studies hydrodynamic characteristics of artificial reef, and analyzes the flow field of combined pyramidal artificial reef with Fluent and based on N-S equation. By comparing the flow field changes under 4 different flow rates (0.1, 0.2, 0.3 and 0.4 m/s), the distribution characteristics of vortices and pressure around are obtained. Three-dimensional turbulent zone of such artificial reef is provided and compared with other types of artificial reef. The results show that the vortex is mainly distributed in the rear area of the diversion tray, and the farther, the weaker; at different flow rates, the maximum height of the ascending flow is about 1.53 times of the height of the reef, the height of the reef vortex area is about the height of the artificial reef, and the length of the vortex zone increases with the velocity of the water; at different flow rates, the range and size of the turbulent zone remain the same..