Ray theory for high-Peclet-number convection-diffusion

Asymptotic methods based on those of geometrical optics are applied to some steady convection-diffusion streamed flows at a high Peclet number. Even w ith the assumption of inviscid, irrotational flow past a body with uniform ambient conditions, the rays from which the solution is constructed can onl y be found after local analyses have been carried out near the stagnation p oints. In simple cases, the temperature away from the body is the sum of co ntributions from each stagnation point.