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The Use of Solution Adaptive Grid for Modelling Small Scale Turbulent Structures

[+] Author Affiliations
G. de With, A. E. Holdo̸

University of Hertfordshire, Hatfield, Hertfordshire, UK

Paper No. HT-FED2004-56515, pp. 1021-1029; 9 pages
doi:10.1115/HT-FED2004-56515
From:
  • ASME 2004 Heat Transfer/Fluids Engineering Summer Conference
  • Volume 2, Parts A and B
  • Charlotte, North Carolina, USA, July 11–15, 2004
  • Conference Sponsors: Heat Transfer Division and Fluids Engineering Division
  • ISBN: 0-7918-4691-1 | eISBN: 0-7918-3740-8
  • Copyright © 2004 by ASME

abstract

The use of Large Eddy Simulation (LES) is computationally intensive and various studies demonstrated the considerable range of vortex scales to be resolved in an LES type of simulation. The purpose of this study is to investigate the use of a Dynamic Grid Adaptation (DGA) algorithm. Despite many developments related to adaptive methods and adaptive grid strategies, the use of DGA in the context of turbulence modelling is still not well understood, and various profound problems with DGA in relation to turbulence modelling are still present. The work presented in this paper focuses on the numerical modelling of flow around a circular cylinder in the sub-critical flow regime at a Reynolds number of 3.9·103 . LES simulations with conventional mesh and DGA have been performed with various mesh sizes, refinement criteria and re-meshing frequency, to investigate the effects of re-meshing on the flow field prediction. The results indicate that the turbulent flow field is sensitive to modifications in the mesh and re-meshing frequency, and it is suggested that the remeshing in the unsteady flow region is affecting the onset of small scale flow motions in the free shear layer.

Copyright © 2004 by ASME
Topics: Turbulence , Modeling

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