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Journal of Mechanical Science and Technology

, Volume 33, Issue 4, pp 1641–1649 | Cite as

Grid-independent large-eddy simulation of turbulent wake flow using explicit differential filters

  • Myeongseok Kang
  • Donghyun YouEmail author
  • Satbir Singh
Article
  • 12 Downloads

Abstract

Large-eddy simulations (LES) using explicit filtering are performed to obtain grid-independent solutions of turbulent wake flow behind a circular cylinder at ReD = 3900 on non-Cartesian type grids. A differential elliptic equation where the filter kernel is implicitly defined is discretized in an unstructured-grid solver to enable explicit filtering on non-Cartesian grids. The separation of filtering procedure from discretization is known to produce an LES solution of which error is mainly attributed to the capability of a sub-filter scale (SFS) model. Equipped with the differential filter and the Vreman SFS model, explicitly filtered LES on unstructured grids is shown to produce nearly grid-independent solutions for flow over a circular cylinder at a critical Reynolds number.

Keywords

Explicit filter Differential filter Large-eddy simulation Filter to grid ratio Cylinder Curvilinear grid Unstructured solver 

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© KSME & Springer 2019

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringPohang University of Science and TechnologyPohangKorea
  2. 2.Department of Mechanical EngineeringCarnegie Mellon UniversityPittsburghUSA

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