Numerical studies of high-speed cavity flows using LES, DDES and IDDES

2013 ◽  
Author(s):  
Marcel Ilie
Keyword(s):  
High Speed ◽  
Cavity Flows ◽  
Numerical Studies

scholarly journals Numerical Investigation into Flutter and Flutter-Buffet Phenomena for a Swept Wing and a Curved Planform Wing

2019 ◽  
Vol 2019 ◽  
pp. 1-19 ◽  
Author(s):  
Mario Rosario Chiarelli ◽  
Salvatore Bonomo
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
High Speed ◽  
Sensitivity Study ◽  
Fuel Saving ◽  
Swept Wing ◽  
Instability Condition ◽  
Aspect Ratios ◽  
Numerical Studies ◽  
Classical Flutter

The results of numerical studies carried out on high-aspect-ratio wings with different planforms are discussed: the transonic regime is analysed for a swept wing and a curved planform wing. The wings have similar aspect ratios and similar aerodynamic profiles. The analyses were carried out by CFD and FE techniques, and the reliability of the numerical aerodynamic results was proven by a sensitivity study. Analysing the performances of the two wings demonstrated that in transonic flight conditions, a noticeable drag reduction can be obtained by adopting a curved planform wing. In addition, for such a wing, the aeroelastic instability condition, consisting in a classical flutter, is postponed compared to a conventional swept wing, for which a flutter-buffet instability occurs. In a preliminary manner, the study shows that, for a curved planform wing, the high speed buffet is not an issue and at the same time notable fuel saving can be achieved.

Experimental and Numerical Studies on Super-Cavitating Flow of Axisymmetric Cavitators

2010 ◽  
Author(s):  
Byoung-Kwon Ahn ◽  
Hyoung-Tae Kim ◽  
Chang-Sup Lee
Keyword(s):  
Boundary Element Method ◽  
High Speed ◽  
Inviscid Flow ◽  
The Body ◽  
Cavitating Flows ◽  
Practical Advantage ◽  
Numerical Studies ◽  
Numerical Predictions ◽  
Cavitation Tunnel ◽  
National University

Recently underwater systems moving at high speed such as a super-cavitating torpedo have been studied for their practical advantage of the dramatic drag reduction. In this study we are focusing our attention on super-cavitating flows around axisymmetric cavitators. A numerical method based on inviscid flow is developed and the results for several shapes of the cavitator are presented. First using a potential based boundary element method, we find the shape of the cavitator yielding a sufficiently large enough cavity to surround the body. Second, numerical predictions of supercavity are validated by comparing with experimental observations carried out in a high speed cavitation tunnel at Chungnam National University (CNU CT).

Using High-Frequency Pulsed Supersonic Microjets to Control Resonant High-Speed Cavity Flows

AIAA Journal ◽  
2020 ◽  
Vol 58 (8) ◽  
pp. 3378-3392
Author(s):  
Phillip A. Kreth ◽  
Farrukh S. Alvi
Keyword(s):  
High Frequency ◽  
High Speed ◽  
Cavity Flows

Aerothermal Performance of Shielded Vane Design

2017 ◽  
Vol 139 (11) ◽  
Author(s):  
Ioanna Aslanidou ◽  
Budimir Rosic
Keyword(s):  
Heat Transfer ◽  
Total Pressure ◽  
High Speed ◽  
Guide Vane ◽  
Leading Edge ◽  
Experimental Facility ◽  
Numerical Studies ◽  
Nozzle Guide Vane ◽  
Inlet Conditions ◽  
Nozzle Guide

This paper presents an experimental investigation of the concept of using the combustor transition duct wall to shield the nozzle guide vane leading edge. The new vane is tested in a high-speed experimental facility, demonstrating the improved aerodynamic and thermal performance of the shielded vane. The new design is shown to have a lower average total pressure loss than the original vane, and the heat transfer on the vane surface is overall reduced. The peak heat transfer on the vane leading edge–endwall junction is moved further upstream, to a region that can be effectively cooled as shown in previously published numerical studies. Experimental results under engine-representative inlet conditions showed that the better performance of the shielded vane is maintained under a variety of inlet conditions.

Simulation of High-Speed Cavity Flows in a Scramjet Engine by the Space-Time CESE Method

2005 ◽  
Author(s):  
Shaeng-Tao J. Yu ◽  
Chang-Kee Kim ◽  
Zeng-Chan Zhang
Keyword(s):  
High Speed ◽  
Space Time ◽  
Cavity Flows ◽  
Scramjet Engine

Numerical Simulations of High-Speed Turbulent Cavity Flows

2009 ◽  
Vol 83 (4) ◽  
pp. 569-585 ◽  
Author(s):  
G. N. Barakos ◽  
S. J. Lawson ◽  
R. Steijl ◽  
P. Nayyar
Keyword(s):  
Numerical Simulations ◽  
High Speed ◽  
Cavity Flows
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