Flow streamline based Navier–Stokes Characteristic Boundary Conditions: Modeling for transverse and corner outflows

► Highlight current limitations of outflow treatments for transverse flows. ► Improve the flow acceleration prediction at characteristic outflows. ► Decrease flow distorsions at open boundary conditions. Some limitations of three dimensional Navier–Stokes Characteristic Boundary Conditions (3D-NSCBC...

Full description

Saved in:
Bibliographic Details
Published in:Computers & fluids 2011-12, Vol.51 (1), p.115-126
Main Authors: Albin, Eric, D’Angelo, Yves, Vervisch, Luc
Format: Article
Language:English
Subjects:
Applied sciences
Boundaries
Boundary conditions
Combustion. Flame
Computational fluid dynamics
Corners
Direct Numerical Simulation
Energy
Energy. Thermal use of fuels
Engineering Sciences
Exact sciences and technology
Fluid flow
Fluid mechanics
Fluids mechanics
Large Eddy Simulation
Mathematical models
Mechanics
Navier-Stokes equations
Outflow
Physics
Theoretical studies
Theoretical studies. Data and constants. Metering
Vortices
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:► Highlight current limitations of outflow treatments for transverse flows. ► Improve the flow acceleration prediction at characteristic outflows. ► Decrease flow distorsions at open boundary conditions. Some limitations of three dimensional Navier–Stokes Characteristic Boundary Conditions (3D-NSCBC) are discussed for flows traveling in a direction that is oblique to the boundary. To limit errors generated at boundaries with flows having any arbitrary direction, it is proposed to organize the wave decomposition in a coordinate system that is attached to the local flow streamline crossing the boundary, because some modeled expressions are not frame independent. Compared to previous 3D-NSCBC, the modified strategy accounting for oblique waves is found to improve the outflow treatment for transverse outgoing vortices, up to vortices crossing an outflow corner. The method is also applied to an expanding laminar flame.
ISSN:0045-7930
1879-0747
DOI:10.1016/j.compfluid.2011.08.005