Approximate Wall Boundary Conditions in the Large-Eddy Simulation of High Reynolds Number Flow
Abstract
The near-wall regions of high Reynolds numbers turbulent flows must be modelled to treat many practical engineering and aeronautical applications. In this project we carried out and analyzed results from simulations of both attached and separated flows on coarse grids in which the near-wall regions were not resolved and were instead represented by approximate wall boundary conditions. The simulations use the dynamic Smagorinsky subgrid-scale model and a second-order finite difference method. Typical results are found to be mixed, with acceptable results found in many cases in the core of the flow far from the walls, provided there is adequate numerical resolution, but with poorer results generally found near the wall. Deficiencies in this approach are caused in part by both inaccuracies in subgrid-scale modelling and numerical errors in the low-order finite difference method on coarse near-wall grids, which should be taken into account when constructing models and performing large eddy simulation on coarse grids. A promising new method for developing wall models from optimal control theory was developed which is being pursued under a new AFOSR contract.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 10, 2000
- Accession Number
- ADA383992
Entities
People
- Parviz Moin
Organizations
- Stanford University