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The development process of a turbulent spot in plane Poiseuille flow, as well as the related turbulence characteristics, are investigated using direct numerical simulation at transitional Reynolds numbers. We compare the results obtained under two different conditions of either constant mass flux or constant driving force. The results clearly indicate the turbulent spot grows rapidly but stays compact when driven by a constant-mass-flux, the turbulence intensity in its core getting more intense with time, while the spot subjected to constant-driving-force develops turbulent stripes.
Author(s):
Takahiro Tsukahara
Tokyo University of Science
Japan
Takahiro Ishida
Tokyo University of Science
Japan
Yohann Duguet
LIMSI-CNRS
France