重叠网格在船舶CFD中的应用研究

文章采用RANS方法和重叠网格计算了带自由液面的船舶绕流问题。计算网格采用重叠网格的型式,自由液面的模拟采用单相Level-Set方法,Reynolds应力采用k-ω模型,采用体单元有限差分方法和PISO算法求解RANS方程。文中简要描述了重叠网格和单相Level Set自由液面模拟方法的数学模型及求解。通过对S60单体船型约束模和自由模型采用重叠网格的数值求解及与试验结果的比较表明该重叠可较好地模拟带自由液面船舶自由态绕流问题。另采用重叠网格对一简单的双体船和三体船进行了数值求解,计算结果也表明重叠网格和单相Level-Set方法可较好地模拟带自由液面的船舶绕流问题。

Overlap grid research on the application of ship CFD

RANS methods and overlap grid are used to calculate the ship flow around with free surface.Computational grid is overlap grid pattern.The single phase Level Set method was used for the free surface treatment,the SST k-ω turbulence model,cell finite difference method and PISO algorithm were employed in viscous flow calculation with solving RANS equations.The mathematical model and solution of overlap grid and simulation method of single phase Level Set method were described briefly,too.Through the numerical solution with overlap grids and the comparison with experimental results for fix and free S60,catamaran and trimaran,the overlap grid can well simulate the viscous free-surface flow around the ship.the calculation results show that overlap grid and single phase Level-Set method can better simulate the viscous free-surface flow around a ship.