Investigation and numerical analysis based on DNS/PDF method on the jet meandering in a round counter-jet

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It was found by the simultaneous measurements on the velocity and concentration fields of matter that a round jet injected into a counter uniform flow possessed strong mixing ability. Time-delayed measurements between the velocity field in an axisymmetrical plane and the concentration field in a cross-sectional plane of the jet were also conducted to elucidate the physical mechanism causing the jet wandering. Furthermore, the flip-flop jet which has a similar jet wandering as the counter-jet was investigated numerically. The mult-igrid method, together with parallelization, was incorporated in numerical analysis to accelerate the calculation speed. The simulated flow showed a jet wandering matching quantitatively with the experimental results, confirming the validity of the calculation method.