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Turbulent channel flow controlled by traveling-wave-like body force mimicking oscillating thin films
- Source :
- Physics of Fluids. 34:085106
- Publication Year :
- 2022
- Publisher :
- AIP Publishing, 2022.
-
Abstract
- To improve energy efficiency, flow control techniques for skin-friction drag and heat transfer with regard to wall turbulence are essential. This study performs direct numerical simulation of turbulent channel flows. The traveling-wave-like body force is employed as the flow control technique to break the similarity between momentum and heat transfer. The traveling wave control mimics the self-excited thin film in the corresponding experimental study. When the wave traveled slowly along the downstream direction, the skin-friction drag, heat transfer, and analogy factor were found to increase. Moreover, these parameters increased with an increase in the reference height of the traveling wave ( hw). Flow visualization shows turbulence enhancement owing to the increase in hw. Three-component decomposition elucidates the difference between the control effect on the Reynolds shear stress and the turbulent heat flux.
Details
- ISSN :
- 10897666 and 10706631
- Volume :
- 34
- Database :
- OpenAIRE
- Journal :
- Physics of Fluids
- Accession number :
- edsair.doi.dedup.....681105fda97433443253d5fa2cc4e550