Numerical Simulation Of Compressible Vortices

Download or read book Numerical Simulation of Compressible Vortices written by Scott A. Morton and published by . This book was released on 1989 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: A delta wing at a high angle of attack produces two vortices that generally undergo dramatic increases in core size, followed by the formation of regions of reversed flow. This phenomenon is called vortex breakdown and can have significant effects on the aircraft's lift, drag, and moment coefficients. The objective of this thesis is to provide a base line model of the compressible vortex, independent of the complex body interaction with the delta wing. The mathematical model is then used to simulate vortex breakdown for various vortex strengths, Reynolds numbers, and Mach numbers with particular attention given to the effects of compressibility. After running many simulations it was found that Mach number has a favorable effect by delaying vortex breakdown as defined above. Holding Reynolds number and vortex strength constant while increasing Mach number reduced the effective vortex strength while compressing the flow. Another important result of this compressible flow study was the disappearance of non-unique solutions at Re = 200 and V = 1.0 as Mach number was increased. No paths of non-unique solutions were found for M> 0.2. Keywords: Navier stokes solutions. (KR).