A model for the surface brightness of a turbulent low Mach number jet. III - Adiabatic jets of arbitrary density ratio: Application to NGC 315

1986 ◽  
Vol 305 ◽  
pp. 109 ◽  
Author(s):  
G. V. Bicknell
Keyword(s):  
Mach Number ◽  
Surface Brightness ◽  
Density Ratio ◽  
Low Mach Number

scholarly journals Self-sustained oscillations in variable-density round jets

2007 ◽  
Vol 582 ◽  
pp. 341-376 ◽  
Author(s):  
JOSEPH W. NICHOLS ◽  
PETER J. SCHMID ◽  
JAMES J. RILEY
Keyword(s):  
Stability Analysis ◽  
Mach Number ◽  
Linear Stability ◽  
Linear Stability Analysis ◽  
Diffusion Flames ◽  
Density Ratio ◽  
Variable Density ◽  
Transition To Turbulence ◽  
Absolute Instability ◽  
Low Mach Number

The stability properties of round variable-density low-Mach-number jets are studied by means of direct numerical simulation (DNS) and linear stability analysis. Fully three-dimensional DNS of variable-density jets, with and without gravity, demonstrate that the presence of buoyancy causes a more abrupt transition to turbulence. This effect helps to explain differences between normal gravity and microgravity jet diffusion flames observed in the laboratory.The complete spectrum of spatial eigenmodes of the linearized low-Mach-number equations is calculated using a global matrix method. Also, an analytic form for the continuous portion of this spectrum is derived, and used to verify the numerical method. The absolute instability of variable-density jets is confirmed using Brigg's method, and a comprehensive parametric study of the strength and frequency of this instability is performed. Effects of Reynolds number, the density ratio of ambient-to-jet fluid (S1), shear-layer thickness and Froude number are considered. Finally, a region of local absolute instability is shown to exist in the near field of the jet by applying linear stability analysis to mean profiles measured from DNS.

scholarly journals Low Mach number fluctuating hydrodynamics for electrolytes

2016 ◽  
Vol 1 (7) ◽  
Author(s):  
Jean-Philippe Péraud ◽  
Andy Nonaka ◽  
Anuj Chaudhri ◽  
John B. Bell ◽  
Aleksandar Donev ◽  
...  
Keyword(s):  
Mach Number ◽  
Fluctuating Hydrodynamics ◽  
Low Mach Number

scholarly journals An interface capturing method for liquid-gas flows at low-Mach number

2021 ◽  
Vol 216 ◽  
pp. 104789
Author(s):  
Federico Dalla Barba ◽  
Nicoló Scapin ◽  
Andreas D. Demou ◽  
Marco E. Rosti ◽  
Francesco Picano ◽  
...  
Keyword(s):  
Mach Number ◽  
Gas Flows ◽  
Low Mach Number ◽  
Interface Capturing
Sign in / Sign up

Export Citation Format

Share Document