Applicability of numerical prediction method of dynamic derivatives is studied with forced oscillation method and free oscillation method on the airframe/propulsion integrative vehicle with and without fairing. Effect of parameters on dynamic derivative prediction in forced oscillation method such as time step and oscillation frequency is analyzed in detail. It shows that forced oscillation method is well applied in dynamic derivative prediction of integrative vehicle with internal and external flow, while parameters select of time step, computational time and oscillation frequency are quite different from external-flow-only vehicle. Dynamic derivatives by free oscillation method are in agreement with results with forced oscillation method on external-flow-only vehicle. There is a difference about 50% on integrative vehicle with internal and external flow. Origin and mechanism of differences in two methods need to be deeply studied.

In a model for interaction between one atmosphere uniform glow discharge plasma (OAUGDP)and air proposed by Shyy,electric field and electric forces acting on air as body force are obtained.The electric field is calculated with electric potential equation. The influence of OAUGDP on flows around a NACA0015 airfoil at low speed is investigated by solving N-S equation with a body force term.Plasma located upstream of the separation point damps the flow separation around the airfoil efficiently,while plasma located downstream of the separation point has little effect on the flow.It agrees with experimental observations. Effect of plasma on aerodynamics of airfoil and pressure distribution on airfoil surface are investigated.

With a high-order weighted compact nonlinear scheme(WCNS) for space discretization,several different implicit methods,including LU-SGS,Gauss-Seidel point-relaxation,line-relaxation and GMRES(generalized minimal residual),are compared in the simulation of hypersonic viscous flows.Both point and line relaxations with analytical Jacobian matrix converge faster than those of LU-SGS.GMRES obtains a faster convergence rate combined with line relaxation.