CAJ | 학술논문

针对薄片多体气动力干扰问题,建立了相关的控制方程和湍流方程,分别采用二阶迎风格和全隐式方法进行空间离散和时间离散,建立了含碰撞响应的非结构动网格方法.利用耦合求解Navier-Stokes方程和刚体动力学方程,数值模拟了薄片多体沉降过程.数值模拟结果与试验记录的运动状态符合较好.对薄片多体沉降干扰非定常流场结构变化的分析和对其流动机理的研究结果显示,多体间的干扰不仅改变物体的运动姿态,而且促进分离.近距的初始相对位置下,薄片运动初期产生接触,提供了物体分离的反向冲量.薄片在干扰作用下滞空翻转并存在互斥的趋势,侧缘形成附着涡,伴随着物体运动发展脱落.
침대박편다체기동력간우문제,건립료상관적공제방정화단류방정,분별채용이계영풍격화전은식방법진행공간리산화시간리산,건립료함팽당향응적비결구동망격방법.이용우합구해Navier-Stokes방정화강체동역학방정,수치모의료박편다체침강과정.수치모의결과여시험기록적운동상태부합교호.대박편다체침강간우비정상류장결구변화적분석화대기류동궤리적연구결과현시,다체간적간우불부개변물체적운동자태,이차촉진분리.근거적초시상대위치하,박편운동초기산생접촉,제공료물체분리적반향충량.박편재간우작용하체공번전병존재호척적추세,측연형성부착와,반수착물체운동발전탈락.
For the aerodynamics of multi-plates interference,the control equation and turbulent equation were established,and the second-order upwind scheme and fully implicit method were respectively applied to discrete the space and the time.A collision method under unstructured dynamic grids was established by solving Navier-Stokes equations coupled with rigid body dynamics.The descent process of plates was numerically simulated.The simulation results are well consistent with the experiment results.The unsteady flow-field structures and mechanism of multi-plates ＇interferential descent were anlyzed.The result shows that the interference among multi-plates influences their motion and accelerate the separation.The collision results in a reverse impulse to separate the plates at incipient motion under initial close locations.The plates present a repellent trend in fluttering and tumbling motion under the action of interferences.Vortex forms and sheds on the flank with the motion of objects.