水流作用下的渔网水动力数值方法研究

A numerical method for hydrodynamic loads of the net

为了研究渔网在水流作用下的受力及变形情况,文章基于ABAQUS二次开发技术,结合网平面经验公式,编写了水动力计算模型。根据网衣的密实度、雷诺数和网平面与流速的夹角与水动力系数的关系式,计算出每个网目的水动力系数,再施加在网衣的每个网目上,最终计算出整个网衣的水动力和变形情况。同时在该方法中也考虑了流速衰减的问题。通过此方法验证了网箱在不同网格数和沉子质量时水动力和网箱体积计算结果的准确性,未来可以应用该方法计算网箱在水流下的水动力。

In this paper, a numerical method which was applied to calculate the hydrodynamic force of the net was performed. The hydrodynamic force acting on each net panels were calculated with screen model, and the force coefficients were expressed as functions of solidity, Reynolds and inflow angle. The wake effects were also considered . A parameter study of single net cage was subjected to a steady flow varying the flow velocity and the weight of sinker . Validation of the numerical model was conducted by comparing the numerical results with the corresponding physical model measurement. The comparisons show that both the net chamber and the hydrodynamic force results are in accordance with those of the physical model. The results demonstrate that this numerical method is applicable for the calculation of the hydrodynamic force of the net under the current.