空中加油系统的多体动力学和CFD仿真（英文）

Simulation of Aerial Refueling System with Multibody Dynamics and CFD

介绍了作者基于Fortran程序开发的一个多体动力学求解器。依托多刚体系统理论、基于绝对节点坐标(ANCF)法描述的常质量/变质量索梁单元和计算多体动力学方程组求解技术,该求解器可用于分析飞行器拖曳结构中的索-刚体约束系统的动力学问题。本文基于并行CFD求解器PMB3D的动态重叠网格功能,构建了多体动力学和计算流体力学的非定常耦合计算程序。以软式空中加油系统为例,对真实外形飞行器拖曳系统的气动-动力学特性进行了仿真研究。探讨了战斗机构型进行软式加油对接时产生的气动干扰问题,研究了受油机的接近速度和初始偏移量对对接效果的影响。

A coupled simulation of multibody dynamics and Computational Fluid Dynamics （CFD） is implemented to investigate the motion of an aerial refueling hose-drogue with a receiver aircraft approaching.The hose is modeled by a chain of one-dimensional absolute nodal coordinate cable elements,with the cable elasticity and bending effects considered.Structured overlapped grids are applied around the receiver aircraft and the rigid drogue attached to the end of the hose.A multibody simulation code is embedded in the RANS solver to analyze the structure dynamics and the fluid dynamics for each coupled iteration loop.Various approaching velocity profiles are tested and the ＂push-out＂ effect is observed.Approaching simulations with the receiver aircraft in different initial offsets are performed and analyzed.It is concluded that with certain approaching parameters,a good coupling between the receiver＇s probe and the drogue is expected.