23 Result(s)
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Article
Numerical investigation of separation-induced transition in a low-pressure turbine cascade in a low-disturbance environment
In this paper, the separation-induced transition in an LPT (low-pressure turbine) cascade is investigated at low Reynolds number with DNS (direct numerical simulation). The transition process is accurately pre...
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Article
Investigations of an enclosed annular rotor-stator system with LES method
In this study, the flows in an enclosed annular rotor-stator system with the Reynolds number ranging from 0.75×105 to 3.75×105 and an aspect ratio of 36.5 are investigated using the LES method. Few studies have e...
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Article
Forward-facing steps induced transition in a subsonic boundary layer
A forward-facing step (FFS) immersed in a subsonic boundary layer is studied through a high-order flux reconstruction (FR) method to highlight the flow transition induced by the step. The step height is a thir...
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Article
Direct numerical simulation of hypersonic transition induced by an isolated cylindrical roughness element
Hypersonic boundary layer transition induced by an isolated cylindrical roughness element is investigated using direct numerical simulation method based on a finite volume formulation. To simulate the transiti...
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Article
The effects of vortex breakdown on the static rolling aerodynamics of finned slender body
The static rolling aerodynamics of a finned slender body is numerically studied in this paper. Simulation results show a nonlinear uprising of the rolling moment when the angle of attack is greater than 20° in...
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Competition of the multiple Görtler modes in hypersonic boundary layer flows
Competition of multiple Görtler modes in hypersonic boundary layer flows are investigated with the local and marching methods. The wall-layer mode (mode W) and the trapped-layer mode (mode T) both occur in the...
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Article
Floquet analysis of fundamental, subharmonic and detuned secondary instabilities of Görtler vortices
Nonlinear parabolized stability equations are employed in this work to investigate the nonlinear development of the Görtler instability up to the saturation stage. The perturbed boundary layer is highly inflec...
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Numerical investigation of the casing treatment mechanism with a single circumferential groove
The paper investigates the effect of a single circumferential groove casing treatment (CGCT) on a transonic compressor rotor numerically. In particular, the effect of the groove at different axial locations on...
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Article
A Karman-Vortex Generator for passive separation control in a conical diffuser
Flow separation in a conical diffuser with large divergence angle (29.14°) and large area ratio (3.533) is eliminated by a novel passive flow control device called Karman-Vortex Generator (KVG). The effect of ...
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Article
Simulation of shock wave buffet and its suppression on an OAT15A supercritical airfoil by IDDES
In the present paper, extremely unsteady shock wave buffet induced by strong shock wave/boundary-layer interactions (SWBLI) on the upper surface of an OAT15A supercritical airfoil at Mach number of 0.73 and an...
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Article
Study of flow induced by sine wave and saw tooth plasma actuators
The effect of plasma actuator that uses saw-tooth or sine-wave shape electrodes on boundary layer flows is experimentally investigated. The measurement results are compared with a corresponding standard config...
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Article
Secondary instability control of compressible flow by suction for a swept wing
The crossflow instability of a three-dimensional boundary layer is a main factor affecting the transition around the swept-wing. The three-dimensional boundary layer flow affected by the saturated crossflow vo...
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Article
Analysis of the secondary instability of the incompressible flows over a swept wing
The crossflow instability of a three-dimensional (3-D) boundary layer is an important factor which affects the transition over a swept-wing. In this report, the primary instability of the incompressible flow o...
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Article
An analysis of the Circumferential Grooves Casing Treatment for transonic compressor flow
The stall mechanism of the NASA Rotor 37 is investigated through the analysis of the critical flow structures near the stall under the transonic condition. The performance of the rotor with Circumferential Gro...
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Article
Studies of the unsteady supersonic base flows around three afterbodies
Unsteady supersonic base flows around three afterbodies, cylindrical (Cy), boattailed (BT) and three-step (MS), are investigated in this paper. Reynolds-averaged Navier–Stokes (RANS) and two RANS/LES (large-ed...
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Article
Modelling flow transition in a hypersonic boundary layer with Reynolds-averaged Navier-Stokes approach
Based on Reynolds-averaged Navier-Stokes approach, a laminar-turbulence transition model is proposed in this study that takes into account the effects of different instability modes associated with the variati...
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Article
Observation of the lower hybrid waves near the three-dimensional null pair
Magnetic reconnection is a fundamental process in plasma, which is thought to play important roles both in laboratory and natural plasmas through affecting magnetic topology, heating and accelerating particles...
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Article
Research of the rapid pressure-strain correlation model in the rapid distortion limit
Even though a number of rapid pressure-strain models have been suggested and successfully tested for different flow situations by various authors, the model proposals still exhibit some apparent deficiencies w...
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Article
Analysis of flow structures in supersonic plane mixing layers using the POD method
The proper orthogonal decomposition (POD) method was applied to analyzing the database obtained from the direct numerical simulation (DNS) of supersonic plane mixing layers. The effect of different forms of th...
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Article
Modelling of pressure–strain correlation in compressible turbulent flow
Previous studies carried out in the early 1990s conjectured that the main compressible effects could be associated with the dilatational effects of velocity fluctuation. Later, it was shown that the main compr...
