Turbulent transition simulation using thek-ω model

Zheng, Xiaoming; Liu, Chaoqun; Liu, Feng; Yang, Chun

doi:10.1002/(sici)1097-0207(19980715)42:5<907::aid-nme393>3.0.co;2-t

Cited by 38 publications

(18 citation statements)

References 23 publications

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“…The wall displacement obtained from the hyperelastic model is larger than the one provided from the linear elastic model, particulary in the curved tube. Our results show good agreement with the findings from the literature [7,15,18,21]. We thus conclude that the mathematical model presented in section 2 is suitable to study the blood flow in the system of coronary arteries with stenosis ( Figure 5).…”

Section: Resultssupporting

confidence: 91%

“…where   , , , , The ALE technique is employed for the solution of the weak formula (18)(19)(20)(21)(22) which are constructed on the Lagrangian frame, but are solved on the Eulerian frame or spatially fixed system. Thus, computation is conducted by a transformation between two coordinate systems.…”

Section: The Ale Finite Volume Formulation For the Turbulence Fluid Flowmentioning

confidence: 99%

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Numerical Simulation of Turbulent Blood Flow in the System of Coronary Arteries with Stenosis

Kaewbumrung¹,

Wiwatanapataphee²,

Orankitjaroen³

et al. 2017

J Biom Biostat

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In this paper, we propose a mathematical model of turbulence flow of fluid through a deformable channel to study the pulsatile blood flow in the coronary system with arterial stenosis. Blood is assumed to be an incompressible nonNewtonian fluid and its motion is considered as turbulent and modelled by the mass and momentum conservations with turbulent mixing energy and specific dissipation rate. The mechanical deformation of the arterial wall is modelled by a hyperelastic differential equation. The pulsatile behaviour during each heartbeat is assigned on the entrance and exit boundaries. Numerical simulation based on the Finite Element method for the solution of arterial wall deformation, and the Arbitrary Lagrangian Eulerian Finite Volume method for the turbulence fluid-flow solution is used to investigate the effect of stenosis severity at the proximal part of the left anterior descending artery on the blood velocity, the pressure distribution and the wall shear stresses along the flow direction.

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Section: Resultssupporting

confidence: 91%

Section: The Ale Finite Volume Formulation For the Turbulence Fluid Flowmentioning

confidence: 99%

Numerical Simulation of Turbulent Blood Flow in the System of Coronary Arteries with Stenosis

Kaewbumrung¹,

Wiwatanapataphee²,

Orankitjaroen³

et al. 2017

J Biom Biostat

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“…The turbulence model used in the pre is the Menter's shear stress transport two-equation model, which has provided excel flows involving separation [22,24]. Also, Total Stress Limitation (TSL) method include the effect of flow transition [25]. All computations were performed with a fi in-house code that had been extensively validated [15,16,22].…”

Section: Governing Equationsmentioning

confidence: 99%

Experimental and Computational Study on Separation Control Performance of Synthetic Jets with Circular Exit

Kim¹,

Lee²,

Jun-Hee³

et al. 2016

International Journal of Aeronautical and Space Sciences

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This paper presents experimental and computational investigations of synthetic jets with a circular exit for improving flow control performance. First, the flow feature and vortex structure of a multiple serial circular exit were numerically analyzed from the view point of flow control effect under a cross flow condition. In order to improve separation control performance, experimental and numerical studies were conducted according to several key parameters, such as hole diameter, hole gap, the number of hole, jet array, and phase difference. Experiments were carried out in a quiescent condition and a forced separated flow condition using piezoelectrically driven synthetic jets. Jet characteristics were compared by measuring velocity profiles and pressure distributions. The interaction of synthetic jets with a freestream was examined by analyzing vortical structure characteristics. For separation control performance, separated flow over an airfoil at high angles of attack was employed and the flow control performance of the proposed synthetic jet was verified by measuring aerodynamic coefficient. The circular exit with a suitable hole parameter provides stable and persistent jet vortices that do beneficially affect separation control. This demonstrates the flow control performance of circular exit array could be remarkably improved by applying a set of suitable hole parameters.

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“…In principle, laminar flow breakdown, the development of turbulent spots and transition to fully turbulent flow can be simulated very accurately using DNS. 30 A DNS computation is performed by solving the full time-dependent Navier-Stokes equations. Since there is no Reynolds averaging, then there is no requirement for turbulence closure by a turbulence model.…”

Section: E Dns For Transitionmentioning

confidence: 99%