Geometric sensitivity of three-dimensional separated flows

Cherry, Erica M.; Elkins, Christopher J.; Eaton, John K.

doi:10.1016/j.ijheatfluidflow.2008.01.018

Cited by 108 publications

(118 citation statements)

References 16 publications

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“…Similar to Obi diffuser, the Cherry diffuser has been used as a benchmark for the investigation of performance of turbulence models and numerical approaches in recent years. A direct numerical simulation of turbulent flow in the Cherry diffuser (Cherry et al, 2008) was conducted by Ohlsson et al (2010) with a massively parallel high-order spectral element method and their results were in good agreement with the experimental data. Jakirlić et al (2010) applied LES and a zonal hybrid LES/RANS scheme to predict the turbulent flow through the 3D diffuser investigated by Cherry et al (2008).…”

Section: Introductionmentioning

confidence: 69%

“…They also found that the sub-grid scale model plays a major role for prediction of both mean momentum and turbulent kinetic energy. Schlüter et al (2005) Cherry et al (2008 and) performed experiments to measure the mean velocity field in two separate 3D asymmetric diffusers using the magnetic resonance velocimetry method. The measured flow fields in both diffusers showed 3D boundary layer separation but the structure of the separation bubble exhibited a high degree of sensitivity to the diffuser geometrical dimensions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Computation of Developing Turbulent Flow through a Straight Asymmetric Diffuser with Moderate Adverse Pressure Gradient

Salehi

Raisee

Cervantes

2017

JAFM

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In this paper, numerical investigation of three-dimensional, developing turbulent flow, subjected to a moderate adverse pressure gradient, has been investigated using various turbulence models, namely: the low-v f  and a variant of Reynolds stress model. The results are compared with the detailed velocity and pressure measurements. Since the inlet condition is uncertain, a study was first performed to investigate the sensitivity of the results to the inlet boundary condition. The results showed the importance of including the contraction effects. It is seen that the developing flow inside the straight duct, is highly sensitive to the inlet boundary condition. The comparisons indicate that all turbulence models are able to predict a correct trend for the centerline velocity and pressure recovery inside the straight duct and diffuser but the low-Re k   and RSM turbulence models yield more realistic results. The SST k   model largely overpredicts the centerline velocity and boundary layer thickness in the straight duct. The comparisons of the numerical results also revealed that the RSM model, due to its anisotropic formulation, is able to reproduce the secondary flows. As expected, the RSM model demonstrates the best performance in prediction of the flow field and pressure recovery in the asymmetric diffuser.

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Section: Introductionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Computation of Developing Turbulent Flow through a Straight Asymmetric Diffuser with Moderate Adverse Pressure Gradient

Salehi

Raisee

Cervantes

2017

JAFM

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“…The geometry and flow conditions correspond to the "diffuser 1" of Cherry et al 21 The grid and boundary conditions are the same as in Jeyapaul. 22 The grid is nearly LES-quality.…”

Section: D Diffusermentioning

confidence: 99%

On the dynamic computation of the model constant in delayed detached eddy simulation

2015

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The current work puts forth an implementation of a dynamic procedure to locally compute the value of the model constant CDES , as used in the eddy simulation branch of Delayed Detached Eddy Simulation (DDES). Former DDES formulations [P. R. Spalart et al., "A new version of detached-eddy simulation, resistant to ambiguous grid densities," Theor. Comput. Fluid Dyn. 20, 181 (2006) The current work puts forth an implementation of a dynamic procedure to locally compute the value of the model constant C DES , as used in the eddy simulation branch of Delayed Detached Eddy Simulation (DDES

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“…Separated §ow in a 3D rectangular di¨user has been studied in the experiments [11]. It was shown that the separation zone is strongly sensitive to geometric characteristics of the di¨user.…”

Section: Three-dimensional Diffuser Flowmentioning

confidence: 99%

“…One more validation test of the in §ow generation method has been done, namely, the §ow in a 3D di¨user studied in the experiments [11]. This §ow is di©cult to simulate by means of RANS turbulence models because of the presence of secondary §ows driven by normal Reynolds stresses anisotropy.…”

Section: Introductionmentioning

confidence: 99%

Assessment of an approach to generating inflow synthetic turbulence for large eddy simulations of complex turbulent flows

Adamian

Travin

2013

Progress in Flight Physics

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An approach to generating in §ow synthetic turbulence recently developed by the authors has been applied to zonal Reynolds-Averaged Navier Stokes (RANS) / Large Eddy Simulations (LES) of two complex turbulent §ows: §ow over a wall-mounted hump and hydrofoil trailing edge §ow, and to a LES of a §ow in a three-dimensional (3D) di¨user. The results show that the zonal RANS-LES approach with synthetic turbulence at the interface is in excellent agreement with experimental data for hump and trailing edge §ows. For the di¨user §ow, it is shown that results depend signi¦cantly on the RANS model used to provide averaged velocity and Reynolds stresses at the inlet.

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Geometric sensitivity of three-dimensional separated flows

Cited by 108 publications

References 16 publications

Computation of Developing Turbulent Flow through a Straight Asymmetric Diffuser with Moderate Adverse Pressure Gradient

Computation of Developing Turbulent Flow through a Straight Asymmetric Diffuser with Moderate Adverse Pressure Gradient

On the dynamic computation of the model constant in delayed detached eddy simulation

Assessment of an approach to generating inflow synthetic turbulence for large eddy simulations of complex turbulent flows

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