Numerical experiments in thermal convection with and without mean shear
Abstract/Contents
- Abstract
- The specific problem of thermal convection with and without mean shear is studied. By leveraging advances in flow visualization, numerical algorithms, and large-scale computing, both laboratory and numerical experiments are just beginning to outline a picture of turbulent convection in wide fluid layers and clarify the effects of buoyancy and related analogies on shear-flow turbulence in many industrial and environmental fluid flows. Herein, mean shear is established by mechanical means and density fluctuations induced by heating a horizontal fluid layer sandwiched between hot and cold walls. Even without mean shear, vigorous convection currents develop under the influence of such heating by the direct action of buoyant body forces. It is of some importance to predict how heat transport by both big and small eddies is affected by the action of buoyancy and mean shear in wall-bounded channel flows as well as in other more complex configurations. One of the most striking features of unstable buoyant shear layers is the appearance of unsteady longitudinal vortices, which are characterized by an organized helical circulation of individual buoyant thermals stirred into alignment by mean shear near the walls. These are in marked contrast to the polygonal convection cells and heat transport associated with Rayleigh-Benard convection without strong mean shear. This report provides a unique physical picture of wall turbulence in these flows and discusses the significance of the present results for predicting and modeling subgrid-scale phenomena.
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource. |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2018; ©2018 |
| Publication date | 2018; 2018 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Hamman, Curtis Wayne |
|---|---|
| Degree supervisor | Moin, Parviz |
| Thesis advisor | Moin, Parviz |
| Thesis advisor | Lele, Sanjiva K. (Sanjiva Keshava), 1958- |
| Thesis advisor | Mani, Ali, (Professor of mechanical engineering) |
| Thesis advisor | Urzay Lobo, Javier, 1982- |
| Degree committee member | Lele, Sanjiva K. (Sanjiva Keshava), 1958- |
| Degree committee member | Mani, Ali, (Professor of mechanical engineering) |
| Degree committee member | Urzay Lobo, Javier, 1982- |
| Associated with | Stanford University, Department of Mechanical Engineering. |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Curtis Wayne Hamman. |
|---|---|
| Note | Submitted to the Department of Mechanical Engineering. |
| Thesis | Thesis Ph.D. Stanford University 2018. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2018 by Curtis Wayne Hamman
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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