Towards development of unsteady near-wall interface boundary conditions for turbulence modeling

S. V. Utyuzhnikov

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

In near-wall turbulence modeling it is required to resolve a thin layer nearby the solid boundary, which is characterized by high gradients of the solution. An accurate enough resolution of such a layer can take most computational time. The situation even becomes worse for unsteady problems. To avoid time-consuming computations, a new approach is developed, which is based on a non-overlapping domain decomposition. The boundary condition of Robin type at the interface boundary is achieved via transfer of the boundary condition from the wall. For the first time interface boundary conditions of Robin type are derived for a model nonstationary equation which simulates the key terms of the unsteady boundary layer equations. In the case of stationary solutions the approach is automatically reduced to the technique earlier developed for the steady problems. The considered test cases demonstrate that unsteady effects can be significant for near-wall domain decomposition. In particular, they can be important in the case of the wall-function-based approach.

Original languageEnglish
Pages (from-to)2879-2884
Number of pages6
JournalComputer Physics Communications
Volume185
Issue number11
DOIs
Publication statusPublished - Nov 2014
Externally publishedYes

Keywords

  • Domain decomposition
  • Interface boundary condition
  • Large eddy simulation
  • Low-Reynolds-number model
  • Turbulence
  • Unsteady problems
  • URANS
  • Wall functions

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