草鱼幼鱼周身压力与曲率相关性数值模拟研究

为研究草鱼幼鱼稳定游泳状态下的周身流体压力与鱼体曲率的相关性，采用PIV(Particle Image Velocimetry)实测和数值模拟相结合的方式对草鱼幼鱼周身流体压力和鱼体曲率进行量化分析。结果表明，鱼体振幅曲线的三次拟合相比于传统的二次拟合曲线得到的幼鱼周身流体压力与PIV的实测结果吻合度更高，在幼鱼的中部和尾部，鱼体的中线曲率与体表曲率呈现较为明显的线性关系(P<0.05),且前半个运动周期内的幼鱼周身流体压力与鱼体体表和中线的曲率均呈现线性关系(P<0.05),鱼体中间部位中线曲率的变化要滞后于周身流体压力，而幼鱼尾部和头部的中线曲率则分别与鱼体上下侧流体压力的变化趋势基本一致。

Numerical simulation on the correlation between body pressure and curvature of juvenile Ctenopharyngodon idellus

In order to study the relationship between the body fluid pressure and the body curvature of the juvenile Ctenopharyngodon idellus in a steady swimming state,this paper uses a combination of PIV (Particle Image Velocimetry) measurement and numerical simulation to quantitatively analyze the body fluid pressure and the fish body curvature of the juvenile Ctenopharyngodon idellus.The results show that the three-time fitting of the fish body amplitude curve is more consistent with the measured results of the PIV in the juvenile body fluid pressure obtained from the traditional quadratic fitting curve,in the middle and tail of the juvenile fish,and the midline of the fish body Curvature and body surface curvature show a relatively obvious linear relationship (P<0.05),and the fluid pressure of the juvenile body in the first half of the movement cycle and the curvature of the fish body surface and midline also show a linear relationship (P<0.05).The curvature of the midline of the middle part lags behind the fluid pressure around the body,while the curvature of the midline of the tail and head of the juvenile fish is basically consistent with the change trend of the fluid pressure on the upper and lower sides of the fish.