Bhattacharya, Shashwat ; Pandey, Ambrish ; Kumar, Abhishek ; Verma, Mahendra K. (2018) Complexity of viscous dissipation in turbulent thermal convection Physics of Fluids, 30 (3). 031702. ISSN 1070-6631
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Official URL: http://doi.org/10.1063/1.5022316
Related URL: http://dx.doi.org/10.1063/1.5022316
Abstract
Using direct numerical simulations of turbulent thermal convection for the Rayleigh number between 106 and 108 and unit Prandtl number, we derive scaling relations for viscous dissipation in the bulk and in the boundary layers. We show that contrary to the general belief, the total viscous dissipation in the bulk is larger, albeit marginally, than that in the boundary layers. The bulk dissipation rate is similar to that in hydrodynamic turbulence with log-normal distribution, but it differs from (U3/d) by a factor of Ra−0.18. Viscous dissipation in the boundary layers is rarer but more intense with a stretched-exponential distribution.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Institute of Physics. |
| ID Code: | 118924 |
| Deposited On: | 04 Jun 2021 11:21 |
| Last Modified: | 04 Jun 2021 11:21 |
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