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Simulation of unsteady motion of a propeller in a fluid including free wake modeling

机译:包括自由尾流建模的螺旋桨在流体中的非定常运动仿真

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The problem of flow around a marine propeller performing a general 3D unsteady motion in an infinitely extended fluid is formulated and solved using a boundary element method. Hydrodynamic modeling of the freely moving- unsteady- trailing vortex sheet emanating from each blade is achieved, using vortex filaments and a time stepping method. Thus vortex wake-blade interaction can be taken correctly into consideration. The method uses bilinear panels for the representation of blade and free wake geometry and constant panels for the representation of the unknown dipole intensity. The proposed method produces very stable rollup wake patterns for both steady and unsteady problems for a broad range of discretization parameters. Application of the method to a number of specific cases of steady and unsteady propeller motion has shown the very good numerical performance of the method and that good predictions for forces and pressure distributions can be obtained.
机译:使用边界元方法阐述并解决了在无限扩展的流体中执行一般3D非定常运动的船用螺旋桨周围的流动问题。使用涡旋细丝和时间步长方法,实现了从每个叶片散发出的自由运动,不定轨迹的涡旋片的流体动力学建模。因此,可以正确地考虑涡流尾流叶片相互作用。该方法使用双线性面板表示叶片和自由尾流几何形状,使用常数面板表示未知偶极子强度。对于广泛的离散化参数,该方法针对稳态和非稳态问题均产生非常稳定的汇总唤醒模式。该方法在稳定器和非稳定螺旋桨运动的许多特定情况下的应用表明,该方法具有很好的数值性能,并且可以很好地预测力和压力分布。

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