程载恒,陈荣亮,孙 哲.基于非结构滑移网格技术的旋翼型无人机空气动力学并行数值模拟方法[J].集成技术,2017,6(3):82-91
基于非结构滑移网格技术的旋翼型无人机空气动力学并行数值模拟方法
A Parallel Numerical Simulation Method for the Aerodynamics of RotorUnmanned Aerial Vehicles Based on Unstructured Sliding Meshes
  
DOI:
中文关键词:  并行流体计算;非结构网格;滑移网格技术;旋翼型无人机;区域分解算法
英文关键词:parallel computational fluid dynamics; unstructured mesh; sliding mesh method; aerodynamic of the rotor UAVs; domain decomposition method
基金项目:
作者单位
程载恒 江西师范大学数学与信息科学学院 南昌 330022 
陈荣亮 中国科学院深圳先进技术研究院 深圳 518055 
孙 哲 江西师范大学数学与信息科学学院 南昌 330022 
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中文摘要:
      在现代飞行器设计中,数值模拟方法以低成本、高效率和高灵活性等优点成为研究飞行器空气动力学的重要方法。在旋翼型无人机流场模拟中,由于旋翼与机身存在相互作用,为获得精确模拟结果 需要对整个无人机的流场进行模拟,因此,有效地模拟旋翼与机身的相对运动是实现成功模拟的关键步骤,这使得此类模拟问题极具挑战性。文章设计了一套求解旋翼型无人机空气动力学数值模拟问题的基于非结构滑移网格技术的高可扩展并行计算方法。该方法对控制方程的离散,在空间方向采用非结构移动网格有限元方法,时间推进采用全隐式二阶向后差分格式,最后采用一种并行 Newton-Krylov-Schwarz方法求解离散后的非线性方程组。作为应用,文章对一个真实旋翼型无人机模型在悬停状态下的外流场进行了数值模拟,获得了一些非常详细的流场信息。数值结果显示,算法在天河 2 号上使用 4 096 个处理器核时仍具有接近线性的并行加速比,这为下一步开展旋翼型无人机的高保真度快速模拟奠定了良好 的基础。
英文摘要:
      In modern aircraft design, numerical simulation becomes an important way to study the aerodynamics of aircraft because of its low cost, high efficiency and high flexibility. In the aerodynamic analysis of rotor unmanned aerial vehicles (UAVs), due to the interaction between rotor and fuselage, we have to model the full rotor UAVs, including the rotor and fuselage, to obtain accurate simulation results. In this kind of simulation, a key step is to effectively model the relative motion between the rotor and fuselage, which is a great challenge. In this paper, a highly scalable parallel computing method based on unstructured sliding meshes for the aerodynamic simulation of rotor UAVs was designed. In the proposed method, an unstructured moving mesh finite element method was used to discretize the governing equations in space, a fully implicit second-order backward differentiation formula was adopted for the temporal discretization, and finaly a parallel Newton-Krylov-Schwarz method was introduced to solve the discritized nonlinear equations. As a case study, we have tested the algorithm on the Tianhe II supercomputer for a rotor UAV in the hover state, and obtained some detailed flow information. Performance results show a nearly linear speedup for up to 4 096 processor cores, suggesting that our solution lays a good foundation for fast and high-fidelity aerodynamic simulation of rotor UAVs.
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