High-Reynolds Number Viscous Flow Simulations on Embedded-Boundary Cartesian Grids

Abstract

Over the grant period, we developed a two-dimensional viscous steady- state flow solver for both laminar and turbulent flow. We developed a way to incorporate wall functions in non-body fitted grids by having each cut cell spawn a linelet from the wall through the cut cell centroid, into the Cartesian grid. We developed a fully conservative method for coupling the wall function to the flow on the Cartesian grid. We extended the wall function into a more general wall model that solves a two point boundary value problem on the linelets. The bvp includes more terms than is typically used in the diffusion model, which is what standard wall functions are based on. The improved wall model on the linelets allow them to go further into the boundary layer, reducing the Cartesian resolution requirements and allowing coarser near-wall Cartesian cells. This work was in collaboration with Michael Aftosmis, at NASA Ames Research Center.

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Document Details

Document Type
Technical Report
Publication Date
May 05, 2016
Accession Number
AD1010304

Entities

People

  • Marsha J. Berger

Organizations

  • New York University

Tags

Communities of Interest

  • C4I

DTIC Thesaurus Topics

  • Boundaries
  • Boundary Layer
  • Boundary Value Problems
  • Computational Fluid Dynamics
  • Diffusion
  • Electronic Mail
  • Equations
  • Flow
  • Fluid Flow
  • Layers
  • Pressure Gradients
  • Reynolds Number
  • Simulations
  • Steady State
  • Turbulent Flow
  • Two Dimensional
  • Viscous Flow

Fields of Study

  • Physics

Readers

  • Computational Fluid Dynamics (CFD)
  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)