At high Reynolds number, large-scale wavy structures in 2D channel flow are unstable to a subharmonic torsional mode with growth rate 0.18 that deforms and splits the waves.
Coherent structures in wall-bounded turbulence , volume=
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Subharmonic instability of large-scale wavy structures in two-dimensional channels
At high Reynolds number, large-scale wavy structures in 2D channel flow are unstable to a subharmonic torsional mode with growth rate 0.18 that deforms and splits the waves.