Numerical calculations of three-dimensional turbulent vortex breakdown

✍ Scribed by Robert E. Spall; Thomas B. Gatski

• Publisher: John Wiley and Sons
• Year: 1995
• Tongue: English
• Weight: 747 KB
• Volume: 20
• Category: Article
• ISSN: 0271-2091
• DOI: 10.1002/fld.1650200404

✦ Synopsis

Numerical solutions to the three-dimensional, unsteady, incompressible Reynolds-averaged Navier-Stokes equations have been obtained for bubble-type vortex breakdown. Two different turbulence models were employed:

(1) standard K-E and (2) an explicit, regularized algebraic Reynolds stress model. Results are computed at a Reynolds number of 10,000. The algebraic Reynolds stress model produced a breakdown bubble with a larger length-to-diameter ratio than did the K--E model. Breakdown also occurred at lower levels of adverse pressure gradient for the algebraic stress model than for the K--E model. In each case single-cell breakdown structures resulted. This is contrasted with numerical calculations for laminar breakdown which reveal the existence of complex multicell bubble breakdown structures.