船舶螺旋桨周围粘流场数值预报与流场分析

Numerical Prediction and Physical Analysis of the Viscous Flow Around a Marine Propeller

本文叙述了通过直接求解雷诺平均应力方程(RANS)来获得船舶螺旋桨粘流场数值解的方法与数值求解步骤,该方法采用非交错网格系统,利用幂函数格式离散动量方程,预报-校正方法求解速度-压力耦合问题,应用Baldwin-Lomax代数湍流模式求解雷诺应力项使方程组封闭,以此来获得螺旋桨粘流场,为了验证数值方法的稳定性和可靠性,文中以DTRC4119桨为算例,对螺旋桨粘流场进行了数值求解,通过对计算结果的分析以及与试验结果的比较,表明该方法不但从定性上,而且能从定量上预报螺旋桨粘流场,发现螺旋桨粘性流动的一些重要特征.

The paper describes a numerical method which has been used to solve the three-dimensional in-compressible Navier-Stokes equations in general curvilinear coordinates for the computation of the flow field around a rotating marine propeller. The power-law scheme is used to discrete the momentum equations and the coupling of the velocity and pressure fields is accomplished based on PISO algorithm. The recently developed non-staggered grid system is employed in the procedure. Turbulence is simulated by using algebraic eddy viscosi-ty model of Baldwin-Lomax. The computed results are analyzed and compared with the available experimental data for the model propeller DTRC4119. The results show that the present method can be used to predict the viscous flow field around a marine propeller not only qualitatively but also quantitatively.