Abstract
Influence of buoyancy on vortex shedding for flow past a circular cylinder placed near a moving wall is studied for different values of the gap-ratio. It is introduced by heating or cooling the cylinder. A finite-volume-based tool OpenFOAM is used for the computations. Influence of buoyancy is investigated by observing the mean velocity in the gap-region between the cylinder and the moving wall, and vorticity on the moving wall. A positive buoyancy (Ri > 0) deflects the flow downward which causes an increase in the velocity in the gap-region while a negative buoyancy (Ri < 0) decreases it. For Ri > 0, the baroclinic production of vorticity is negative in the gap-region while for Ri < 0, it is positive. Therefore, for Ri > 0, vorticity on the moving wall increases which causes the strength of the lower shear-layer of the cylinder to decrease while for Ri < 0, the strength of the shear-layer increases. At high values of G/D, vortex shedding occurs for Ri > 0 while at low values of G/D, vortex shedding occurs for Ri < 0. Interesting results have been observed for G/D = 0.3, where vortex shedding occurs for both Ri > 0 and Ri < 0.
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Acknowledgements
The first author would express his thanks to Council of Scientific and Industrial Research, New Delhi, India for providing financial support through the award of Junior Research Fellowship [Ref. 09/086(1244)/2015-EMR-I].
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Tanweer, S., Dewan, A., Sanghi, S. (2021). Influence of Buoyancy on Flow Past a Circular Cylinder Near a Moving Wall. In: Venkatakrishnan, L., Majumdar, S., Subramanian, G., Bhat, G.S., Dasgupta, R., Arakeri, J. (eds) Proceedings of 16th Asian Congress of Fluid Mechanics. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-15-5183-3_59
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DOI: https://doi.org/10.1007/978-981-15-5183-3_59
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