单片网衣周围流场特性的数值模拟

Numerical simulation of the flow fields around fishing net

对单片网衣进行了数值模拟,采用GAMBIT软件建立网衣周围流场数值模型,然后利用基于有限体积法的数值计算方法求解控制方程,借助于商业计算流体动力学软件FLUENT对其进行数值模拟计算,模拟过程中把网衣看成多孔透水板,使用多孔介质模型来求解,多孔介质的抵抗力系数根据实际实验中网衣的受力推导得出。数值模拟中分析了在不同流速和不同冲角组合情况下的单片网衣周围的流场,并与实验结果进行对比,在冲角为30°～90°之间,流速折减率、网衣的阻力系数和升力系数都与实验结果吻合很好,平均误差在9.3%之内。因此,对比结果表明,FLUENT中的多孔透水介质模型可以适用于单片网衣周围流场特性的数值模拟。

A mathematical model which simulated the flow fields around fishing net was designed by GAMBIT, and a numerical computational method based on finite volume approach was used for solving the control equation, the model was numerically simulated by using the commercial computational fluid dynamics software FLUNET, in the simulation the net was modeled as a sheet of porous panel, so the porous model of the software was used to the numerical computation, the model resistance coefficients needed for the porous media equations were derived from the force measured in the experiments. There was a comparison between the presented study and the measured data with different velocities and different angle of attack, the results showed that the numerical simulation seemed to agree well with measured data for both current reduction behind the net panel and the drag and lift force on the net panel, the agreement between measured and modeled data is good with a mean error of 9.3% when the attack angle from 30° to 90°. Therefore, the porous media based on the FLUENT is suitable for the flow fields simulation around the net.