Relaminarization of stably stratified turbulent Poiseuille flows at low Reynolds number

Abstract eng:
Direct numerical simulations of spectral method were performed to study relaminarizing turbulent structures in Poiseuille flow under stable density stratification. In the case of small computational domain, the turbulence attenuated with increasing effect of stable stratification, and relaminarization occurred on one wall side at Ri > 0.30 where the turbulence remain on the other wall. Here, Ri is the bulk Richardson number defined by bulk mean velocity. On the other hand, in the case of large computational domain, relaminarization on one wall side was not observed and large scale intermittent flow structure appeared at Ri > 0.17. Also, turbulent stripes were observed at Ri = 0.56. Therefore, the flow dynamics in SB and LB were different from each other. The flow structure of the turbulent stripe was similar to the ones in turbulent Poiseuille flow in transitional regions without any external forces.

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