Optics aberrations aroused by moving vorticity pulse

Optics aberrations are studied for the case when the aero-noise pulse is propagating through the optical beam. The flow is governed by the Favre-averaged N-S equations. To split the viscosity flux and the convective flux of the N-S equations, the second-order central scheme and the AUSMPW+ scheme, based on the third-order MUSCL one, are adopted respectively. With the four-step Runge-Kutta scheme in fourth-order, the code is advanced in time. The J-B turbulence model, with the Sarkar's compressive modification, is used for turbulence simulations. Aero-optical effects are analyzed with the physics optics by introducing the mean flow OTF(Optical Transfer Function) and turbulence OTF. The results indicate that the moving vorticity pulse can bring the maximal boresight error up to 1.7 μrad, an