ISSN:
0271-2091
Schlagwort(e):
Numerical simulation
;
Vortical flow
;
Navier-Stokes and Euler equations
;
Double-delta wing
;
Vortex interaction
;
Vortex breakdown
;
Grid resolution
;
Engineering
;
Engineering General
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Maschinenbau
Notizen:
Extensive study on the numerical simulation of the vortical flow over a double-delta wing is carried out using the ‘thin layer’ Navier-Stokes and Euler equations. Two important flow characteristics, vortex interaction and vortex breakdown, are successfully simulated. Grid resolution is one of the most important factors associated with the vortex problem. Computations were performed on a series of grids with various levels of refinement, coarse, medium and fine. Computations using either the coarse or medium grids fail to capture the proper physical phenomena. The computed result using a fine grid shows flow unsteadiness once the vortex breakdown takes place. The CL-α characteristics are well predicted up to the breakdown angle of attack for all the grid distributions. The Euler solutions show fairly good agreement with experiment on the CL-α characteristics. However, other aspects of the solution at each angle of attack, such as the locus of the leading-edge separation vortex, are not consistent with experiment. Even for the fine grid Navier-Stokes computations, further grid resolution is required to obtain good quantitative agreement with experiment.
Zusätzliches Material:
11 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/fld.1650081014
