Abstract Body force propulsion model has been used for ship self-propulsion CFD simulation for a long time due to its higher computational efficiency and less computer source required. This paper presents a new body force method coupled the blade element momentum theory (BEMT) considering the three-dimensional viscous effects with the RANS solvers. In-house code HUST-Ship was used to solve RANS equations with finite difference method and PISO arithmetic for propulsion model and ship hydrodynamic simulation. KP505 propeller and KCS ship model were used as the numerical model for the studies. Open water characteristics of discretized propeller model were obtained after uncertainty analysis of CFD results. The lift coefficients CL and the drag coefficients CD of different radius sections on the propeller blade were obtained from CFD results of open water characteristics. The multivariate regression method was used to get the correlations between CL, CD and propeller parameters for a propeller model. Then the BEMT method would adopt the correlations with the local velocity at the virtual disk from CFD simulation results simultaneously to calculate the thrust and torque distributions on the blade and thrust and torque of the propulsion model were obtained with integration along the blade. The comparisons of open water characteristics of CFD results between three different body force models and discretized propeller model were performed. The CFD simulation for open water characteristics and velocity distribution around propulsion models are almost same for new body force model and discretized propeller model. The self-propulsion simulations of KCS with new body force model were performed. The comparisons of the KCS self-propulsion simulations results with new body force model, discretized propeller model and EFD results showed good matches with each other.

中文翻译：

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用于船舶螺旋桨仿真的改进体力推进模型

摘要 体力推进模型由于计算效率高、所需计算机资源少，长期以来一直用于船舶自航CFD仿真。本文提出了一种新的体力方法，该方法结合了叶片单元动量理论 (BEMT)，同时考虑了 RANS 求解器的三维粘性效应。内部代码 HUST-Ship 用于通过有限差分法和 PISO 算法求解 RANS 方程，用于推进模型和船舶水动力模拟。KP505 螺旋桨和 KCS 船模被用作研究的数值模型。对CFD结果进行不确定性分析，得到离散螺旋桨模型的开放水域特性。螺旋桨叶片上不同半径截面的升力系数CL和阻力系数CD是从开放水域特性的CFD结果中得到的。多元回归方法用于获得螺旋桨模型的 CL、CD 和螺旋桨参数之间的相关性。然后BEMT方法将同时采用CFD仿真结果与虚拟盘上局部速度的相关性来计算叶片上的推力和扭矩分布，并沿叶片积分获得推进模型的推力和扭矩。进行了三种不同体力模型和离散螺旋桨模型之间 CFD 结果的开放水域特性的比较。对于新的体力模型和离散螺旋桨模型，推进模型周围的开放水域特性和速度分布的 CFD 模拟几乎相同。使用新的体力模型对 KCS 进行了自推进模拟。KCS自航模拟结果与新的体力模型、离散螺旋桨模型和EFD结果的比较表明相互匹配良好。