Published In
Physics of Fluids
Document Type
Post-Print
Publication Date
6-1-2024
Subjects
Fluid dynamics
Abstract
Direct numerical simulations are performed to study the behavior of the wake behind a 5:2 streamwise rotating prolate spheroid. The Reynolds number Re = 1000 under different rotational speeds over a large range of is considered, where Ω is the non-dimensional rotational speed based on the freestream velocity and the volume-equivalent diameter of the prolate spheroid. By successively increasing the rotational speed, seven distinct flow regimes were identified and explored: steady state, low-speed steady rotation state, axisymmetric state, high-speed steady rotation state, twofold rotational symmetrical state (TFRS), quasi-periodic vortex shedding state (QVS), and weakly chaotic state. Among these wake regimes, the TFRS regime is reported for the first time, and it can be interpreted as an outcome of the stabilizing influence of the spheroid's rotation acting to restore the wake structure to an axisymmetric state. It is found that the rotation of the prolate spheroid has a stabilizing effect under low rotational speeds. Furthermore, the coupling mechanism between the rotational double helical structure and vortex shedding in the QVS regime has been revealed. The results of this study contribute to closing the knowledge gap regarding the wake dynamics of a streamwise rotating prolate spheroid.
Rights
This is the accepted version. The final version, © Copyright 2024 AIP Publishing LLC, is available from the publisher: https://doi.org/10.1063/5.0207836
Locate the Document
DOI
10.1063/5.0207836
Persistent Identifier
https://archives.pdx.edu/ds/psu/42462
Citation Details
Wu, Y., Yang, J., Andersson, H. I., Chen, J., & Zhu, X. (2024). [Post-print] On the transitional wake past a streamwise rotating prolate spheroid. Physics of Fluids, 36(6).
