Aero-optical Effects Simulation Based on Turbulence Vortex Model

For the simulation of aero-optical effects in engineering application, the influence of coherent structure on the optical transmission cannot be considered because RANS method ignores the details of the flow fluctuation. A random phase screen method based on turbulence sphere vortex model is improved to predict the optical distortion caused by instantaneous coherent vortex structure. The main idea of improvement is to relate the sphere vortex parameters to the local dynamic characteristic of the flow field. The simulation of optical distortion in compressible mixing layers shows that the improved random screen method has good agreement with the results from the direct integration of the intensity and the accuracy is great higher than the original method.