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Weakened energy cascade in elastoinertial turbulence
1Department of Mathematics, University College London, Gower Street, London WC1E 6BT, United Kingdom.
Physical Review. E
|July 17, 2021
Summary
In elastoinertial turbulence, energy dissipation differs from Newtonian turbulence. Energy is primarily lost through polymer chain relaxation across all scales, not requiring interscale transport.
Area of Science:
- Fluid dynamics
- Polymer physics
Background:
- Newtonian turbulence involves energy transfer from large to small scales.
- Elastoinertial turbulence exhibits a weakened interscale energy flux.
Purpose of the Study:
- To explain the weakened interscale energy flux in elastoinertial turbulence.
- To identify the primary dissipation mechanism in elastoinertial flows.
Main Methods:
- Numerical simulations of elastoinertial turbulence.
Main Results:
- Elastoinertial energy is mainly dissipated via polymer chain relaxation.
- Polymer chain relaxation is effective across all scales, unlike scale-dependent Newtonian dissipation.
- This relaxation mechanism bypasses the need for interscale energy transport.
Conclusions:
- Polymer chain relaxation is the dominant dissipation pathway in elastoinertial turbulence.
- The scale-independent nature of polymer relaxation explains the weakened interscale energy flux.
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