THE DYNAMICS OF COHERENT STRUCTURES IN A TURBULENT WAKE PAST A SPHERE AT RE=3700

Fengrui Zhang, Yulia T. Peet

Research output: Contribution to conferencePaperpeer-review

Abstract

The turbulent wake flow past a sphere at ReD = 3700 is investigated via Direct Numerical Simulation (DNS). The characteristic motions in the wake flow, such as vortex shedding and bubble pumping are identified by the probes placed in the near wake with a dominating frequency of St = fu∞/D = 0.22 and 0.004, respectively. The modal analysis is conducted in the wake area using Proper Orthogonal Decomposition (POD) and Dynamic Mode Decomposition (DMD). The vortex shedding and bubble pumping motions are also captured by the modal analysis. The results from POD and DMD show comparable patterns of both characteristic motions. For the bubble pumping motion, the dominating frequency of the corresponding POD mode is St = 0.004, while the DMD mode that is directly related to the separation bubble has the frequency of St = 0.009.

Original languageEnglish (US)
StatePublished - 2022
Externally publishedYes
Event12th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2022 - Osaka, Virtual, Japan
Duration: Jul 19 2022Jul 22 2022

Conference

Conference12th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2022
Country/TerritoryJapan
CityOsaka, Virtual
Period7/19/227/22/22

ASJC Scopus subject areas

  • Aerospace Engineering
  • Atmospheric Science

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