Investigation of flow characteristics around a freely falling rigid sphere in a bounded fluid domain employing the shear stress transport k - ω improved delayed detached eddy simulation model

Deepak K. Pandey, Juhun Song, Hee Chang Lim

Research output: Contribution to journalArticlepeer-review

Abstract

The flow fields around a freely falling rigid sphere slamming onto a water surface in the bounded and unbounded domains were investigated using the shear stress transport k - ω improved delayed detached eddy simulation model. Based on the velocity of the sphere for all the domain cases, the Reynolds number was set equal to 106 in the investigation. The bounded domain was simulated by moving closer the wall of the water container from all around to the impacting location of rigid sphere and correlating it to the blockage ratio (BR). Two cases of bounded domains (BR = 45% and 70%) and a single case of the unbounded domain (BR = 0.01%) were studied. This study focused on analyzing the flow field when the sphere begins to impact the water until it is completely submerged. For BR = 70%, the mixing of air and water was observed in the wake region after making the complete submergence of the solid rigid sphere. In contrast, no such mixing was observed for other cases. The boundary layer reveals an increase in velocity and wall effect in the case of the bounded domain as compared to the unbounded domain. Higher magnitude of boundary layer thickness was achieved in the case of the unbounded domain as compared to the bounded domain. The Q and λ2 were used for vortex identification, and both the criteria were found to agree well with each other.

Original languageEnglish
Article number015108
JournalPhysics of Fluids
Volume34
Issue number1
DOIs
Publication statusPublished - 1 Jan 2022
Externally publishedYes

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