应用分区有限体积法数值计算舵粘性水动力

通过数值求解不可压缩粘性流的RANS方程计算均匀来流中的船舵水动力。采用标准的κ-ε湍流模式封闭方程，并用二阶有限体积法在非交错分区贴体网格上对守恒方程进行离散；采用Rhie和Chow的插值方法确定单元面的质量通量，用SIMPLE法求解压力分布，用壁函数法处理壁面边界条件。对一种NACA冀型舵在两种不同雷诺数下大攻角范围的流动进行了计算，得到的舵水动力与试验结果和他人的计算结果进行比较，在舵未达到失速角前吻合良好，而所确定的舵失速角与最大升力值则均偏小。失速角后舵背流面的流动分离点也能捕捉到。最后分析了雷诺数对舵水动力的影响。

Numerical Prediction of Rudder Forces Using a Multi-block Finite Volume Method

The three- dimensional Reynolds- averaged Navier- Stokes (RANS) equations with the stan-dard k - ε turbulence model as a closure are solved by the standard SIMPLE algorithm for the incompress-ible turbulent flows around a ship rudder in uniform inflow. The conservation equations are discretized on acollocated multi - block body - fitted grid by using a second - order cell - centered finite volume method(FVM) . To reduce the computational time, a wall function is used for realizing the non - slip condition atwalls. Computations were performed on a rudder at two different Reynolds numbers with angles of attack rang-ing from 0 to 26 degrees. The computed results are in good agreement with the experimental measurementsand other authors' computational results, while the calculated stall angles and maximum lifts at stall anglesare slightly smaller.