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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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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