Filtering Boundary Conditions for LES and Embedded Boundary Simulations

Abstract

Two related observations lead us to propose a new approach for embedding boundaries in the context of LES. In this approach, we treat the wall by filtering through it'. A homogeneous or nearly homogeneous filter is applied to the flow field including the embedded boundary. As a result, the boundary is no longer a sharp interface, but is diffused across the filter width. To recover a Direct Numerical Simulation (DNS), the filter width is made small enough to resolve all relevant scales of motion, but remains finite so that the boundary is not a sharp interface. In LES, the scale on which the boundary is resolved is consistent with the resolved scales of motion.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 2001
Accession Number
ADP013656

Entities

People

  • Arun Das
  • R. D. Moser

Organizations

  • University of Illinois Urbana–Champaign

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Channel Flow
  • Computational Fluid Dynamics
  • Computational Science
  • Equations
  • Flow
  • Flow Fields
  • Fluid Dynamics
  • Fluid Flow
  • Geometry
  • Large Eddy Simulation
  • Mechanical Properties
  • Navier Stokes Equations
  • Poiseuille Flow
  • Pressure Gradients
  • Reynolds Number
  • Turbulence
  • Turbulent Mixing

Readers

  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Fluid Mechanics and Fluid Dynamics.