- Title
- Reappraisal of the k - e model constants for the wake of a circular cylinder
- Creator
- Tang, S. L.; Djenidi, Lyazid; Antonia, Robert Anthony; Zhou, Y.
- Relation
- 11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019. Proceedings of the 11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019 (Southampton, UK 30 July, 2019 - 02 August, 2019) p. 111-115
- Relation
- https://www.dl.begellhouse.com/references/3ce1b491115b5c16,53905d91329956a8,51bffd2a38f81c4c.html#
- Publisher
- Darmstadt University of Technology
- Resource Type
- conference paper
- Date
- 2019
- Description
- Starting with the N-S equations, Tang et al. (2015b) have derived an analytical expression of Cε2 along the centreline in the far-wake of a circular cylinder and found that the value of Cε2 differs markedly from the standard value of 1.92. This present study, in which we examine the effect of the mean shear on Cε2 in regions away from the flow centreline, complements and extends our earlier examination of Cε2 in this flow (Tang et al., 2015b). Further, an analytical expression of Cε1 is also derived from the N-S equations. The numerical value of Cε1 is significantly smaller than the commonly used value of 1.44. Using these "new" values of Cε2 and Cε1 as new model constants in the k−ε turbulence model, we find that the velocity defect Ud and the half-width of the far-wake L0 agree reasonably well with the experimental data. When the calculation is based on the standard model constants, there is significant departure from the experimental data.
- Subject
- N-S equations; circular cylinder; mean shear; constants
- Identifier
- http://hdl.handle.net/1959.13/1446057
- Identifier
- uon:42750
- Identifier
- ISSN:2642-0554
- Language
- eng
- Reviewed
- Hits: 633
- Visitors: 625
- Downloads: 0