实时飞行器仿真系统的液体载荷动力学算法  

Liquid Payload Hydrodynamics Simulation Method for Real-Time Aircraft Simulation System

作　　者：顾安平[1] 徐锦法[1] 

机构地区：[1]南京航空航天大学旋翼动力学国家级重点实验室,南京210016

出　　处：《南京航空航天大学学报》2013年第4期491-496,共6页Journal of Nanjing University of Aeronautics & Astronautics

基　　金：南京航空航天大学研究生创新基地(实验室)开放基金(KFJJ120101)资助项目;中央高校基本科研业务费专项资金资助项目

摘　　要：精确的流体运动计算耗时且对计算环境要求高,一般只能用于离线计算分析任务。对于实时飞行器要求快速计算的场合,一般只能使用简化模型,精度低,且无法完整模拟实际情况。针对这一矛盾,依靠图器(Graphic processing unit,GPU)的强大计算能力,给出了一套基于光滑粒子流体动力学(Smoothed hydrodynamics,SPH)方法,并利用GPU实现全部计算的实时液体载荷计算方案。作为一种无网格流体法,SPH保证了流体特性计算上的准确性。针对GPU平台大规模并行特性的优化,使得计算速度远远超基于CPU的解算方案,最终达到实时交互的水平。与CFD软件OpenFOAM对同一工况仿真计算,实验明,本方法能够获得精确的液体运动仿真结果,且每步计算所用时间小于仿真步长时间,达到实时水平,足实时飞行器仿真系统对液体载荷子系统的动力学仿真要求。Precise fluid dynamics simulation which is a very heavy computation task always demands high level computer devices. So it can only be applied to offline fluid analysis. On the occasion that a fast computation is necessary, a much simplified model is the only choice. Simplified model consumes much less computation power, but can only offer low precision, and cannot integratly reflect real fluid dynam ics. Based on the powerful computation capacity of graphic processing unit（GPU）, a realtime liquid payload hydrodynamics simulation method useing smoothed particle hydrodynamics（$PH） to model flu id characteristic and fuIly solved by GPU is presented. As a nongrid computational fluid dynamics meth od, SPH guarantees the high accuracy of fluid dynamics simulation. Large scale parallel computing opti mization for GPU platform dramatically accelerates the simulation speed. Simulation test result indicates that this method is as accurate as OpenFOAMa famous computational fluid dynamics（CFD） software, more faster than any CPU solver, and well meets the requirements of realtime aircraft simulation sys tem.

关 键 词：实时 流体仿真 光滑粒子流体动力学 图形处理器 

分 类 号：V247.4[航空宇航科学与技术—飞行器设计]