Nonequilibrium fluctuations of the direct cascade in surface quasi-geostrophic turbulence
Abstract
We study the temporal fluctuations of the flux of surface potential energy in surface quasi-geostrophic (SQG) turbulence. By means of high-resolution, direct numerical simulations of the SQG model in the regime of forced and dissipated cascade of temperature variance, we show that the instantaneous imbalance in the energy budget originates a subleading correction to the spectrum of the turbulent cascade. Using a multiple-scale approach combined with a dimensional closure we derive a theoretical prediction for the power-law behavior of the corrections, which holds for a class of turbulent transport equations known as
- Publication:
-
Physical Review Fluids
- Pub Date:
- September 2024
- DOI:
- 10.1103/PhysRevFluids.9.094601
- arXiv:
- arXiv:2406.07235
- Bibcode:
- 2024PhRvF...9i4601V
- Keywords:
-
- Turbulent Flows;
- Physics - Fluid Dynamics