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KAMETANI YUKINORI
Department Undergraduate School , School of Science and Technology Position Senior Assistant Professor |
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| Language | English |
| Publication Date | 2020 |
| Type | Academic Journal |
| Peer Review | Peer reviewed |
| Title | Dissimilarity between turbulent heat and momentum transfer induced by a streamwise travelling wave of wall blowing and suction |
| Contribution Type | Co-authored (other than first author) |
| Journal | Journal of Fluid Mechanics |
| Journal Type | Another Country |
| Publisher | CAMBRIDGE UNIV PRESS |
| Volume, Issue, Page | 886 |
| Author and coauthor | Arjun J. Kaithakkal, Yukinori Kametani, Yosuke Hasegawa |
| Details | A series of direct numerical simulations of a fully developed turbulent channel flow is conducted in order to clarify the effects of travelling wave-like wall blowing and suction on dissimilar heat transfer enhancement. While the wave form is kept sinusoidal and its amplitude is set to be 5 % of the bulk mean velocity, the wavelength and phase speed of the travelling wave are systematically changed in a wide parameter space. As a result, the global optimum of the parameter set for maximizing the analogy factor, which is defined as the ratio between the Stanton number and the skin-friction coefficient, is identified. Interestingly, the obtained globally optimal mode agrees well with that predicted from the optimal control theory taking into account the future dynamics within a limited time horizon by Yamamoto et al. (J. Fluid Mech., vol. 733, 2013, pp. 189-220). |
| DOI | 10.1017/jfm.2019.1045 |
| ISSN | 0022-1120 |