Preventing transition to turbulence: a viscosity stratification does not always help

Details Preventing transition to turbulence: a viscosity stratification does not always help Preventing transition to turbulence: a viscosity stratification does not always help

2005-11-11

arxiv.org/abs/physics/0511098v1

Phys. Rev. Lett. 95, 264504 (2005)

Physics

Fluid Dynamics

9 pages, 8 figures

Scientific paper

10.1103/PhysRevLett.95.264504

In channel flows a step on the route to turbulence is the formation of streaks, often due to algebraic growth of disturbances. While a variation of viscosity in the gradient direction often plays a large role in laminar-turbulent transition in shear flows, we show that it has, surprisingly, little effect on the algebraic growth. Non-uniform viscosity therefore may not always work as a flow-control strategy for maintaining the flow as laminar.

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