Application of recently developed elliptic blending based models to separated flows

Billard, Flavien; Revell, Alistair; Craft, Tim

doi:10.1016/j.ijheatfluidflow.2012.04.012

Cited by 19 publications

(8 citation statements)

References 43 publications

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“…Two external aerodynamics problems are studied in addition to the internal flows: the NACA 0012 at varying angles of attack and the NACA 4412 with a trailing edge separation (Aoa = 12 o ). The flow over the NACA 0012 airfoil is considered for Rec = 10 6 at angles of attack AoA = 0,5,10,15,16,17,18,19. For the lower angles of attack AoA < 17 o the new Reynolds stress model predictions for lift and drag are in close agreement with the experimental values and also agree with the SST model predictions.…”

supporting

confidence: 52%

Application of an Elliptic Blending Reynolds Stress Model in Attached and Separated ﬂows (Invited)

Stoellinger

Roy

Ashton

2015

22nd AIAA Computational Fluid Dynamics Conference

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A novel Reynolds stress model is presented that can be integrated up to the wall through the use of an elliptic blending of a near wall model for the pressure redistribution term and a homogeneous model farther away from the wall. The main novelty of the proposed model consists in using the homogeneous dissipation rate of turbulent kinetic energy ε h instead of ε to model the anisotropic dissipation rate tensor. The model parameters are calibrated by using DNS results for a plane channel flow with a friction Reynolds number of Reτ = 2000. The accuracy of the model is further demonstrated for the channel flow at Reτ = 1000, 4200, and 52000 through comparison with DNS data. To test the model performance in separated flows the periodic hill flow at several Reynolds numbers (Re b = 2800, 5600, 10600, 37000) is considered. For the hill flow, the model performs reasonable well showing slightly better results when compared to results obtained with the Menter's SST k −ω model although both models fail to reproduce the high turbulence levels in the initial separated shear layer. Two external aerodynamics problems are studied in addition to the internal flows: the NACA 0012 at varying angles of attack and the NACA 4412 with a trailing edge separation (Aoa = 12 o ). The flow over the NACA 0012 airfoil is considered for Rec = 10 6 at angles of attack AoA = 0,5,10,15,16,17,18,19. For the lower angles of attack AoA < 17 o the new Reynolds stress model predictions for lift and drag are in close agreement with the experimental values and also agree with the SST model predictions. For the highest angle of attack AoA = 19 o the Reynolds stress model predicts flow separation and thus the lift and drag results are closer to the experimental values when compared to the SST model results. A similar result is found for the 2D NACA 4412 airfoil with trailing edge separation case (AoA = 12 o ). For the cases considered in this study the new Reynolds stress model was very robust but provided only small improvements over the two-equation model results in the flows with separation. Further calibration of the model parameters in a flow with separation could improve the results and will be considered as a next step.

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supporting

confidence: 52%

Application of an Elliptic Blending Reynolds Stress Model in Attached and Separated ﬂows (Invited)

Stoellinger

Roy

Ashton

2015

22nd AIAA Computational Fluid Dynamics Conference

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“…Furthermore, this choice over other candidate 2-equation models would appear not to be a significant source of doubt-based on the conclusions of a recent study on a similar 2D geometry where the six different 2-equation models tested all returned relatively similar results [32,33]. More complex modelling would be required for fully 3D internal flows with boundary layer separation, as demonstrated in recent work where a recently developed Reynolds stress transport model was tested [36]. The same study confirmed suitability of the SST model for 2D flows but demonstrated a need for more complex modelling where 3D flow effects were dominant.…”

Section: Description Of Cfd Models 221 Turbulence Modellingmentioning

confidence: 99%

A computational fluid dynamics (CFD) analysis of fluid excitations on the spindle in a high-pressure valve

Duan

Revell²,

Sinha³

et al. 2019

International Journal of Pressure Vessels and Piping

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There have been a number of significant power outages caused by unexpected levels of flowinduced vibration of valves in partially-open operating conditions and as such the understanding of this phenomena is critically important. On-site testing is normally expensive and inherently difficult given typical flow rates but while computational fluid dynamics (CFD) offers a feasible alternative, it demands careful use and analysis to capture the highly coupled physical phenomena present. This paper reports on the fluid flow around a spindle in a highpressure valve and related flow by means of 2D unsteady Reynolds-Averaged Navier-Stokes (URANS) equations and the k-ω-SST turbulence model. Following a mesh sensitivity study, the measured force frequencies and shockwave patterns predicted around the valve head indicate a high level of agreement with experimental reference data. The unsteady flow is then assessed at various stages of valve-opening; conditions which are increasingly common in the context of power throttling to balance supply from more variable renewable energy sources. Although, the averaged force on the valve head reduces linearly with the lift of stem, the fluctuating component of the force rises by almost 50% when the valve opening changes from 25% to 50%. This quantity, significant in the identification of violent high-frequency vibration, is then observed to reduce steadily upon further opening. Spectral analysis and flow field data provide the basis for further insight with respect to the formation and evolution of a series of shock-wave/boundary-layer interactions along the valve head.

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“…model has been utilized successfully in a few of 2D and 3D flows and has been proved to strike good balance between stability and accuracy [6,9].…”

Section: The Interest In Thementioning

confidence: 99%

“…model consists of Equations (9) and (10) with some modifications, together with Equations (3) and (4)…”

Section: Other Considerations Of the Modelmentioning

confidence: 99%

An improvedk–ω–φ–
Yang¹,
Liu²
2018
Computers & Mathematics with Applications

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Application of recently developed elliptic blending based models to separated flows

Cited by 19 publications

References 43 publications

Application of an Elliptic Blending Reynolds Stress Model in Attached and Separated ﬂows (Invited)

Application of an Elliptic Blending Reynolds Stress Model in Attached and Separated ﬂows (Invited)

A computational fluid dynamics (CFD) analysis of fluid excitations on the spindle in a high-pressure valve

An improvedk–ω–φ–
Yang¹,
Liu²
2018
Computers & Mathematics with Applications

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Application of recently developed elliptic blending based models to separated flows

Cited by 19 publications

References 43 publications

Application of an Elliptic Blending Reynolds Stress Model in Attached and Separated ﬂows (Invited)

Application of an Elliptic Blending Reynolds Stress Model in Attached and Separated ﬂows (Invited)

A computational fluid dynamics (CFD) analysis of fluid excitations on the spindle in a high-pressure valve

An improvedk–ω–φ–Yang1, Liu2 2018Computers & Mathematics with Applications

Contact Info

Product

Resources

About

An improvedk–ω–φ–
Yang¹,
Liu²
2018
Computers & Mathematics with Applications