scholarly journals Numerical Investigation of Turbulent Junction Flow Horseshoe Vortex Dynamics

AIAA Journal ◽  
2021 ◽  
Vol 59 (4) ◽  
pp. 1238-1253
Author(s):  
Zachary Robison ◽  
John-Paul Mosele ◽  
Andreas Gross
Keyword(s):  
Numerical Investigation ◽  
Vortex Dynamics ◽  
Horseshoe Vortex ◽  
Junction Flow

Numerical investigation of blade-tip-vortex dynamics

2018 ◽  
Vol 9 (3) ◽  
pp. 373-386 ◽  
Author(s):  
Kurt Kaufmann ◽  
C. Christian Wolf ◽  
Christoph B. Merz ◽  
Anthony D. Gardner
Keyword(s):  
Numerical Investigation ◽  
Vortex Dynamics ◽  
Tip Vortex ◽  
Blade Tip

scholarly journals Experimental and Computational Analysis of Model–Support Interference in Low-Speed Wind-Tunnel Testing of Fuselage-Boundary-Layer Ingestion

2019 ◽  
Vol 304 ◽  
pp. 02020
Author(s):  
Biagio Della Corte ◽  
André A.V. Perpignan ◽  
Martijn van Sluis ◽  
Arvind Gangoli Rao
Keyword(s):  
Boundary Layer ◽  
Wind Tunnel ◽  
Wind Tunnel Test ◽  
Leading Edge ◽  
Horseshoe Vortex ◽  
Junction Flow ◽  
Tunnel Model ◽  
Aerodynamic Interaction ◽  
Support Interference ◽  
Model Support

Junction flow caused by the aerodynamic interaction between a wind-tunnel model and the support structure can largely influence the flowfield and hence the experimental results. This paper discusses a combined numerical and experimental study which was carried out to mitigate the model–support interference in a wind-tunnel test setup for the study of fuselage boundary-layer ingestion. The setup featured an axisymmetric fuselage mounted through a support beam, covered by a wing-shaped fairing. The junction flow appearing at the fuselage–fairing connection produced undesired flow distortions at the fuselage aft section, due to the formation of an horseshoe vortex structure at the fairing leading edge. Numerical and experimental analysis were performed with the aim of reducing the distortion intensity by improving the fairing design. Results show that modifying the leading-edge shape of the fairing effectively decreased the flowfield distortions. Moreover, the addition of a dummy fairing diametrically opposed to the first one was found to be beneficial due to the enhancement of the configuration symmetry.

scholarly journals Correction to: Numerical investigation of blade-tip-vortex dynamics

2018 ◽  
Vol 9 (3) ◽  
pp. 387-387
Author(s):  
Kurt Kaufmann ◽  
C. Christian Wolf ◽  
Christoph B. Merz ◽  
Anthony D. Gardner
Keyword(s):  
Numerical Investigation ◽  
Vortex Dynamics ◽  
Tip Vortex ◽  
Blade Tip

Massively-Parallel DNS and LES of Turbine Vane Endwall Horseshoe Vortex Dynamics and Heat Transfer

2011 ◽  
Author(s):  
Markus Schwa¨nen ◽  
Michael Meador ◽  
Josh Camp ◽  
Shriram Jagannathan ◽  
Andrew Duggleby
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Turbulence Intensity ◽  
Vortex Dynamics ◽  
Turbulent Viscosity ◽  
Horseshoe Vortex ◽  
Surface Heat ◽  
Scale Model ◽  
Pass Filter ◽  
Surface Heat Transfer

Higher turbine inlet temperatures enable increased gas turbine efficiency but significantly reduce component lifetimes through melting of the blade and endwall surfaces. This melting is exacerbated by the horseshoe vortex that forms as the boundary layer stagnates in front of the blade, driving hot gasses to the surface. Furthermore, this vortex exhibits significant dynamical motions that increase the surface heat transfer above that of a stationary vortex. To further understand this heat transfer augmentation, the dynamics of the horseshoe vortex must be characterized in a 3D time-resolved fashion which is difficult to obtain experimentally. In this paper, a 1st stage high pressure stator passage is examined using a spectral element direct numerical simulation at a Reynolds number Re = U∞C/v = 10,000. Although the Re is lower than engine conditions, the vortex already exhibits similar strong aperiodic motions and any uncertainty due to sub-grid scale modeling is avoided. The vortex dynamics are analyzed and their impact on the surface heat transfer is characterized. Results from a baseline case with a smooth endwall are also compared to a passage with film cooling holes. Higher Reynolds number simulations require a Large Eddy Simulation turbulent viscosity model that can handle the high accelerations around the blade. A high-pass-filter sub-grid scale model is tested at the same low Reynolds number to test its effectiveness by direct comparisons to the DNS. This resulted in a significant drop in turbulence intensity due to the high strain rate in the freestream, resulting in different dynamics of the vortex than observed in the DNS. Appropriate upstream engine conditions of high freestream turbulence and large integral length scales for all cases are generated via a novel inflow turbulence development domain using a periodic solution of Taylor vortices that are convected over a square grid. The size of the vortices and grid spacing is used to control the integral length scale, and the intensity of the vortices and upstream distance is used to control the turbulence intensity. The baseline DNS exhibits a bi-modal horseshoe vortex, and the presence of cooling-holes qualitatively increases the number of vortex cores resulting in more complex interactions.

scholarly journals Numerical Investigation of Low-Pressure Turbine Junction Flow

AIAA Journal ◽  
2017 ◽  
Vol 55 (10) ◽  
pp. 3617-3621 ◽  
Author(s):  
Andreas Gross ◽  
Christopher R. Marks ◽  
Rolf Sondergaard
Keyword(s):  
Numerical Investigation ◽  
Low Pressure ◽  
Low Pressure Turbine ◽  
Junction Flow

Improvement of Resistance and Wake Field of an Underwater Vehicle by Optimising the Fin-Body Junction Flow With CFD

2014 ◽  
Author(s):  
Serge Toxopeus ◽  
Roderik Kuin ◽  
Maarten Kerkvliet ◽  
Harry Hoeijmakers ◽  
Bart Nienhuis
Keyword(s):  
Horseshoe Vortex ◽  
Underwater Vehicles ◽  
Design Guidelines ◽  
Added Resistance ◽  
Wake Field ◽  
Junction Flow ◽  
Horseshoe Vortices ◽  
The Impact ◽  
Control Surfaces

To control underwater vehicles appendages such as rudders or fins are generally used. These appendages induce added resistance and deteriorate the quality of the inflow to aft control surfaces or propeller, due to the formation of amongst others horseshoe vortices. In this paper, CFD is used to study the flow around a typical wing-body junction and to obtain insight in how to suppress the horseshoe vortex. For a generic submarine the impact of a range of modifications of the sail on resistance, propulsion and wake field is investigated. Design guidelines regarding the most promising modifications will be given. It will be shown that quite significant improvements of the resistance as well as the wake quality can be obtained by properly designing the junction between the appendage and the hull.

Experimental and Numerical Investigation of a Wing-Body Junction Flow

AIAA Journal ◽  
2012 ◽  
Vol 50 (12) ◽  
pp. 2711-2719 ◽  
Author(s):  
Fabien Gand ◽  
Vincent Brunet ◽  
Sébastien Deck
Keyword(s):  
Numerical Investigation ◽  
Junction Flow
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