Application of the lattice Boltzmann method to transition in oscillatory channel flow

Authors:
  • JCJ A Cosgrove
    J A Cosgrove
  • STS J Tonge
    S J Tonge
  • CMC G Munro
    C G Munro
  • CGC A Greated
    C A Greated
  • DCD M Campbell
    D M Campbell
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Abstract
In this study the applicability of the lattice Boltzmann method to oscillatory channel flow with a zero mean velocity has been evaluated. The model has been compared to exact analytical solutions in the laminar case (Reδ < 100, where Reδ is the Reynolds number based on the Stokes layer) for the Womersley parameter 1 < α < 31. In this regime, there was good agreement between numerical and exact analytical solutions. The model was then applied to study the primary instability of oscillatory channel flow with a zero mean velocity. For these transitionary flows the parameters were varied in the range 400 < Reδ < 1000 and 4 < α < 16. Disturbances superimposed on the numerical solution triggered the two-dimensional primary instability. This phenomenon has not been numerically evaluated over the range of α or Reδ currently investigated. The results are consistent with quasi-steady linear stability theories and previous numerical investigations.

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