- Title
- Experimental study of two side-by-side decaying grid turbulent fields at different mean velocities
- Creator
- Kamruzzaman, M. D.; Djenidi, Lyazid; Antonia, R. A.
- Relation
- Journal of Turbulence Vol. 24, Issue 3-4, no. 2182439
- Publisher Link
- http://dx.doi.org/10.1080/14685248.2023.2182439
- Publisher
- Taylor & Francis
- Resource Type
- journal article
- Date
- 2023
- Description
- A Hot-wire anemometry experiment is conducted to investigate how two turbulent fields decaying with different mean velocities interact at their interface. A grid with different mesh sizes and solidities on either side of the grid centerline is used to generate two turbulent fields. It is found that the resulting turbulent shear layer created at the interface of the two fields evolves in a self-preserving manner. Further, the Taylor microscale Reynolds number, Reλ increases linearly while u2 and q2 become constants as the distance x downstream of the grids increases. Off the centerline one observes the classical decay of turbulence, e.g. u2 varies like x n (n is negative) and Reλ decreases. It is observed that the transport equation for u2 is dominated by the production and pressure-velocity correlation in the central region of the turbulent shear layer while production, dissipation, and turbulent diffusion of the transport equation for q2 dominate in the central part of the shear layer. The pressure-velocity correlation term for q2 is negligible on the centreline of the shear layer and important on the edges. The measurements of the scale-by-scale (SBS) energy terms on the shear layer centerline reveal that the energy transfer from large to small scales occurs in a non-trivial manner.
- Subject
- grid; turbulent shear layer; decay exponent; energy budget
- Identifier
- http://hdl.handle.net/1959.13/1482815
- Identifier
- uon:51032
- Identifier
- ISSN:1468-5248
- Rights
- x
- Language
- eng
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