Abstract
With the Boussinesq approximation of incompressible Navier-Stokes equations, the temperature distribution introduced by natural convection due to buoyancy is analyzed. Then ray optics is applied to calculate the changes of wavefront. For this system, characteristics of the temperature distribution and outlet wavefront are emphatically investigated on different propagation angle. It is found that the wavefront has a change rule of first rising, then decreasing, and then asymptotically converging within 60 s. Furthermore, the buoyancy will seriously affect the temperature distribution, thus affecting the wavefront and propagation at low angles has better output wavefront.
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