Numerical Simulation Of Dynamic Derivatives Of Aircraft Using CFD/CSD Coupling Method

The dynamic derivatives of the aircraft is the basic aerodynamic data for the study of the stability and maneuverability of the aircraft.In the planning process of the aircraft,the dynamic derivatives is worth studying.Therefore,the research on the dynamic derivative of the aircraft is carried out in this paper,and the numerical simulation method of the dynamic derivative of the aircraft is developed.In addition,the development trend of modern aircraft shows the characteristics of high flexibility and large aspect ratio,so the structural elastic vibration problem further causes more research on aeroelastic problems.Aiming at this problem,this paper develops aeroelastic response research of elastic aircraft,develops aeroelastic numerical simulation method of aircraft,and combines this method with dynamic derivative prediction method,enriching the research contents of dynamic derivatives.Firstly,the numerical calculation method of flow field is introduced,including space discretization method,time discretization method,boundary condition and turbulence model;Then the numerical simulation method of the dynamic derivative of the aircraft is introduced,where the small amplitude pitching forced vibration method is adopted,and the program to realize the calculation examples are written;The linear modal superposition method is used to solve the structural dynamic equation;Solving the rigid motion of aircraft using overset grid method and the elastic deformation of aircraft using Delaunay graph mapping method;Exchanging the information between the aerodynamic grid and structure grid using the infinite plate spline method and constant volume transformation processing;Improving loose coupling method using CFD/CSD coupling strategy,in the dynamic grid coupling equations of flow control,the structural dynamic equations and the equations of rigid-body.At last,the programs are written and the adopted method are using to predict the dynamic derivatives of 3D model and the influence of aeroelasticity is analyzed.