An Exact SGS-Model for Les

  • L. Fuchs
Part of the Fluid Mechanics and its Applications book series (FMIA, volume 36)


A new class of Sub-Grid-Scale (SGS) formulations is presented. This class of SGS formulations enables one to derive closed forms of the SGS terms, in contrast to other methods that model these terms. The main difficulty with the exact SGS formulation is the additional data required on the boundaries. A particular form of the SGS terms, belonging to the class, has been implemented for simulating different transitional and turbulent flows. Here, we present some results for wall-free jet flows. For this type of flows, one avoids the difficulties at the boundaries, and therefore may study directly the effects of the SGS formulation. Simulated results have been compared with experimental data and simulations using dynamic SGS model. The new SGS formulation seems to reproduce very well the experimental data.


Large Eddy Simulation Axial Velocity Component Inverse Filter Local Grid Refinement Differential Filter 
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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • L. Fuchs
    • 1
  1. 1.Division of Fluid Mechanics, Department of Heat- and Power-EngineeringLund Institute of TechnologyLundSweden

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