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Scrutinizing Conventional and Eddy-Resolving Unsteady RANS Approaches in Computing the Flow and Aeroacoustics Past a Tandem Cylinder

  • Felix KöhlerEmail author
  • Robert Maduta
  • Benjamin Krumbein
  • Suad Jakirlić
Conference paper
Part of the Notes on Numerical Fluid Mechanics and Multidisciplinary Design book series (NNFM, volume 142)

Abstract

A conventional differential, near-wall Reynolds stress model (RSM) [2] and its eddy-resolving version, sensitized appropriately to account for turbulence unsteadiness (denoted as instability-sensitive RSM - IS-RSM [3]), are applied within the Unsteady RANS computational framework to the flow past an in-line tandem-cylinder arrangement. The scale-supplying equation governing the homogeneous part of the inverse turbulent time scale \(\omega _h\) (\(\omega _h = \varepsilon _h/k)\), both model schemes are based on, includes an additional production term in the IS-RSM formulation. This model term, originating from Menter and Egorov’s Scale-Adaptive Simulation (SAS) concept [11], enables the model’s eddy-resolving capability. The complex unsteady vortex shedding process featuring the tandem cylinder flow at the Reynolds number of \({1.66 \times 10^{5}}\) and cylinder in-between spacing of 3.7D is correctly, qualitatively and quantitatively, captured by the present IS-RSM model, in contrast to the conventional URANS approach. The superiority of the IS-RSM model is reflected furthermore in predicting the acoustic pressure by applying an indirect approach in line with Curle’s acoustic analogy [1].

Keywords

Unsteady RANS Reynolds-stress model Eddy-resolving RANS Tandem cylinder Aeroacoustics Curle’s analogy 

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Copyright information

© Springer Nature Switzerland AG 2020

Authors and Affiliations

  • Felix Köhler
    • 1
    • 2
    Email author
  • Robert Maduta
    • 1
    • 3
  • Benjamin Krumbein
    • 1
  • Suad Jakirlić
    • 1
  1. 1.Institute of Fluid Mechanics and Aerodynamics (SLA)Technische Universität DarmstadtDarmstadtGermany
  2. 2.Institute of Numerical Methods in Mechanical Engineering (FNB)Technische Universität DarmstadtDarmstadtGermany
  3. 3.Outotec GmbH Co & KGOberurselGermany

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