Numerical investigation on nonlinear effect and vortex formation of oscillatory flow throughout a short tube in a thermoacoustic Stirling engine

2017 ◽  
Vol 121 (21) ◽  
pp. 214902 ◽  
Author(s):  
Peng Yang ◽  
Hui Chen ◽  
Yingwen Liu
Keyword(s):  
Numerical Investigation ◽  
Nonlinear Effect ◽  
Oscillatory Flow ◽  
Vortex Formation ◽  
Stirling Engine ◽  
Short Tube

scholarly journals A numerical investigation on the vortex formation and flow separation of the oscillatory flow in jet pumps

2015 ◽  
Vol 137 (4) ◽  
pp. 1722-1731 ◽  
Author(s):  
Joris P. Oosterhuis ◽  
Simon Bühler ◽  
Theo H. van der Meer ◽  
Douglas Wilcox
Keyword(s):  
Numerical Investigation ◽  
Flow Separation ◽  
Oscillatory Flow ◽  
Vortex Formation ◽  
Jet Pumps

scholarly journals Experimental and numerical investigation of the vortex formation process behind a heated cylinder

2004 ◽  
Vol 16 (8) ◽  
pp. 3103-3114 ◽  
Author(s):  
Maosheng Ren ◽  
Camilo C. M. Rindt ◽  
Anton A. van Steenhoven
Keyword(s):  
Numerical Investigation ◽  
Formation Process ◽  
Vortex Formation ◽  
Heated Cylinder

scholarly journals Numerical Investigation of the Cavitation Effects on the Vortex Shedding from a Hydrofoil with Blunt Trailing Edge

Fluids ◽  
2020 ◽  
Vol 5 (4) ◽  
pp. 218
Author(s):  
Jian Chen ◽  
Linlin Geng ◽  
Xavier Escaler
Keyword(s):  
Numerical Investigation ◽  
Vortex Shedding ◽  
Reference Frames ◽  
Vortex Formation ◽  
Wake Flow ◽  
Trailing Edge ◽  
Hydraulic Machinery ◽  
Laminar To Turbulent Transition ◽  
Blunt Trailing Edge ◽  
Shedding Frequency

Vortex cavitation can appear in the wake flow of hydrofoils, inducing unwanted consequences such as vibrations or unstable behaviors in hydraulic machinery and systems. To investigate the cavitation effects on hydrofoil vortex shedding, a numerical investigation of the flow around a 2D NACA0009 with a blunt trailing edge at free caviation conditions and at two degrees of cavitation developments has been carried out by means of the Zwart cavitation model and the LES WALE turbulence model which permits predicting the laminar to turbulent transition of the boundary layers. To analyze the dynamic behavior of the vortex shedding process and the coherent structures, two identification methods based on the Eulerian and Lagrangian reference frames have been applied to the simulated unsteady flow field. It is found that the cavitation occurrence in the wake significantly changes the main vortex shedding characteristics including the morphology of the vortices, the vortex formation length, the effective height of the near wake flow and the shedding frequency. The numerical results predict that the circular shape of the vortices changes to an elliptical one and that the vortex shedding frequency is significantly increased under cavitation conditions. The main reason for the frequency increase seems to be the reduction in the transverse separation between the upper and lower rows of vortices induced by the increase in the vortex formation length.

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