Predictive Capability Assessment of the PANS-\(\zeta \)-f Model of Turbulence. Part I: Physical Rationale by Reference to Wall-Bounded Flows Including Separation

  • C.-Y. Chang
  • S. JakirlicEmail author
  • B. Basara
  • C. Tropea
Conference paper
Part of the Notes on Numerical Fluid Mechanics and Multidisciplinary Design book series (NNFM, volume 130)


The present work deals with validation of the PANS (Partially-Averaged Navier-Stokes) computational methodology coupled with the \(\zeta -f\) RANS model of turbulence [10], formulated and implemented into the CFD software package AVL-FIRE by Basara et al. [2], in a broad range of wall-bounded flows featured by separation, swirling and tumbling motion. The configurations considered in the part I include a fully-developed flow in a plane channel (DNS by Moser et al. [14]) and flow separating from a continuous curved surface (reference database is provided by LES, [7] and [3]). The PANS approach, whose validation represents the prime objective of the present work, provides a seamless transition from the fully-modelled Unsteady RANS to the fully-resolved direct numerical solution (DNS) as the unresolved-to-total ratios of kinetic energy and its dissipation are appropriately varied. In addition, the complementary RANS (by using the \(\zeta -f\) model) computations of the flow configurations considered are also performed. The results obtained illustrate the PANS model capability to capture the turbulence unsteadiness leading consequently to a correct prediction of time-averaged flow quantities, unlike its RANS counterpart. The companion part II [4] is concerned with the PANS model application to more complex flow configurations including a tumbling vortex generation and compression and a swirling flow in a tube, the outlet of which is designed as an orifice with eccentric opening.


Flow Configuration Separate Shear Layer RANS Model Direct Numerical Solution Reynolds Stress Component 
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The financial support of the AVL List GmbH Company, Graz, Austria for C.-Y. Chang is gratefully acknowledged.


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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • C.-Y. Chang
    • 1
  • S. Jakirlic
    • 1
    Email author
  • B. Basara
    • 2
  • C. Tropea
    • 1
  1. 1.Institute of Fluid Mechanics and Aerodynamics/Center of Smart Interfaces Technische Universität DarmstadtDarmstadtGermany
  2. 2.Advanced Simulation Technologies—ASTAVL List GmbHGrazAustria

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