Abstract
We propose a new method to separate the energetic large-scale motions (LSM) and small-scale motions (SSM) using proper orthogonal decomposition (POD) in a turbulent channel flow with spanwise jets for a frictional Reynolds number, \(Re_{\tau } = 394\). The results show that the upstream perturbations enhance streamwise heat flux via energetic LSM and also create a secondary peak of scalar production in the log-layer showing that the perturbations alter LSMs to enhance the heat transfer.
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G. Araya, S. Leonardi, L. Castillo, Numerical assessment of local forcing on the heat transfer in a turbulent channel flow. Phys. Fluids 20(8), 085105 (2008)
B. Balakumar, R. Adrian, Large-and very-large-scale motions in channel and boundary-layer flows. Philos. Trans. R. Soc. Lond. A Math. Phys. Eng. Sci. 365(1852), 665–681 (2007)
S. Dharmarathne, V. Pulletikurthi, L. Castillo, Coherent vortical structures and their relation to hot/cold spots in a thermal turbulent channel flow. Fluids 3(1), 14 (2018)
O. Doche, S. Tardu, Mechanism of wall transfer under steady localized blowing. Int. J. Heat Mass Transfer 55(5), 1574–1581 (2012)
L.H. Hellström, A. Sinha, A.J. Smits, Visualizing the very-large-scale motions in turbulent pipe flow. Phys. Fluids 23(1), 011703 (2011)
J. Hwang, H.J. Sung, Influence of large-scale motions on the frictional drag in a turbulent boundary layer. J. Fluid Mech. 829, 751–779 (2017)
Y.D. Kang, K.S. Choi, H.H. Chun, Direct intervention of hairpin structures for turbulent boundary-layer control. Phys. Fluids 20(10), 101517 (2008)
J. Park, H. Choi, Effects of uniform blowing or suction from a spanwise slot on a turbulent boundary layer flow. Phys. Fluids 11(10), 3095–3105 (1999)
L. Sirovich, Turbulence and the dynamics of coherent structures. i. coherent structures. Q. Appl. Math. 45(3), 561–571 (1987)
S. Tardu, O. Doche, Turbulent passive scalar transport under localized blowing. J. Vis. 11(4), 285–298 (2008)
Acknowledgements
We thank Dr. Stefano Leonardi at UT-Dallas for allowing us to use his channel flow code for this project. We acknowledge the funding provided by National Science Foundation through grant NSF-CBET-ONR:1512393: International Collaboration: The role of initial conditions on LSMs/VLSMs in turbulent boundary layers.
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Pulletikurthi, V., Dharmarathne, S., Hussain, F., Castillo, L. (2019). Influence of Upstream Perturbations on Wall Heat Transfer via Large-Scale Motions. In: Örlü, R., Talamelli, A., Peinke, J., Oberlack, M. (eds) Progress in Turbulence VIII. iTi 2018. Springer Proceedings in Physics, vol 226. Springer, Cham. https://doi.org/10.1007/978-3-030-22196-6_16
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DOI: https://doi.org/10.1007/978-3-030-22196-6_16
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