Alternative Approach to Modelling the Dissipation Equation

  • K. Hanjalić
  • S. Jakirlić
  • J. R. Ristorcelli
Conference paper
Part of the Fluid Mechanics and its Applications book series (FMIA, volume 36)

Abstract

Direct numerical simulations show that even for simple equilibrium flows the models of major interactions in the transport equation for turbulence energy dissipation \( \\varepsilon = v\overline {(\partial {u_i } /\partial {x_l } )^2 } \) do not adequately reflect the corresponding terms in the exact ε equation. This is particularly pronounced in low-Re-number flow regions where the dynamics of dissipative correlation is strongly affected by viscosity and vicinity of a solid wall. The success in reproducing ε reasonably well, even at low-Re-numbers and near walls is achieved by ad hoc tuning of the equation as a whole, concealing the compensating errors in term-by-term modelling. Hence, the application of the models in non-equilibrium situations, different from ones in which the models were calibrated, leads often to unsatisfactory performances.

Keywords

Dissipation Rate Direct Numerical Simulation Plane Channel Gradient Production Viscous Diffusion 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • K. Hanjalić
    • 1
  • S. Jakirlić
    • 2
  • J. R. Ristorcelli
    • 3
  1. 1.Faculty of Applied PhysicsDelft University of TechnologyCJ DelftThe Netherlands
  2. 2.Lehrstuhl für StrömungsmechanikUniversity of ErlangenErlangenGermany
  3. 3.Institute for Computer Applications in Science and EngineeringNASA Langley Research CenterHamptonUSA

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