1 results about "Viscous effect" patented technology

The present application belongs to the technical field of flutter analysis of supersonic vehicles, and proposes a supersonic flutter analysis method based on the viscous local flow piston theory. The method obtains the interference flow field of large attack angle and complex shape by numerically solving the N-S equation through CFD, and then obtains the effective aerodynamic shape of the vehicle according to the vorticity criterion; the surface of the vehicle is discretized to obtain a high-fidelity three-dimensional aerodynamic grid suitable for the piston theory; the flow field parameters and structural modal shapes at the effective shape of CFD are interpolated onto the piston grid by using the thin plate spline interpolation method, the generalized aerodynamic influence coefficient matrix is calculated, and the state space form of the structural dynamics equation is assembled; the flutter analysis is carried out by analyzing the eigenvalues of the state space equation. The analysis method can analyze any complex aerodynamic shape and consider the viscous effect of real gas, and has high calculation accuracy and efficiency.