Transition Prediction on Turbine Blade Profile With Intermittency Transport Equation

Piotrowski, W.; Elsner, Witold; Drobniak, S.

doi:10.1115/1.3072716

Cited by 11 publications

(11 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…We report on one test on wake-induced transition by Pacciani et al [91] on the suction side of the T106A blade and two tests on wake-induced transition by Piotrowski et al [122,145] on the suction side of the N3-60 blade. Later, we illustrate the predictive qualities of four transition models for wake-induced transition on the suction side of the N3-60 blade.…”

Section: Tests Of Transition Models For Wake-perturbed Inflowmentioning

confidence: 98%

“…Meanwhile, some research groups had reconstructed these functions. Examples are Suluksna et al [120], Sørensen [121] and Piotrowski et al [122].…”

Section: The Local Correlation-based γ-Re θ Modelmentioning

confidence: 99%

“…This deficiency was repaired in a later version by Kubacki et al [123] by the introduction of an onset for strong wake impact, as described before. In [122], Piotrowski et al tested the PUIM [118], the dynamic intermittency model of Lodefier and Dick [124] and the γ-Re θ model, but combined with their own correlations, on the N3-60 for background inflow turbulence level 0.4%. All models produce very good predictions of the time-varying intermittency and momentum thickness, but with a time lag of about 15% of the wake impact with respect to the experiments.…”

Section: Tests Of Transition Models For Wake-perturbed Inflowmentioning

confidence: 99%

See 2 more Smart Citations

Transition Models for Turbomachinery Boundary Layer Flows: A Review

Dick

Kubacki

2017

IJTPP

View full text Add to dashboard Cite

Current models for transition in turbomachinery boundary layer flows are reviewed. The basic physical mechanisms of transition processes and the way these processes are expressed by model ingredients are discussed. The fundamentals of models are described as far as possible, with a common structure of the equations and with emphasis on the similarities between the models. Tests of models reported in the literature are summarized and our own test is added. A conclusion on the performance of models is formulated.Keywords: turbomachinery flows; transition models; boundary layers; bypass transition; separationinduced transition; wake-induced transition; Reynolds-averaged Navier-Stokes; intermittency; laminar kinetic energy Transition MechanismsWith the objective of modelling with Reynolds-averaged Navier-Stokes (RANS) or URANS (unsteady or time-accurate RANS) description of a flow, generally, four types of transition from laminar state to turbulent state in turbomachinery boundary layer flows are distinguished [1,2]. These are: natural transition in attached boundary layer state, bypass transition in attached boundary layer state under a statistically steady mean flow, separation-induced transition in the free shear layer formed by separation of a boundary layer under a statistically steady mean flow, and wake-induced transition due to periodically unsteady impact of wakes on boundary layers in attached or separated state. Despite the vast amount of studies on these transition types during the last 4 or 5 decades, understanding of the mechanisms is still not complete, although large progress has been made in the last decade thanks to direct numerical simulation (DNS) and large-eddy simulation (LES). Hereafter, we summarise the mean mechanisms, taking into account the inherent limitations of modelling with Reynolds-averaged Navier-Stokes description of a flow. This means that secondary effects, which mostly are the least understood and sometimes still are a matter of controversy, are not discussed, because, anyhow these features cannot be represented by RANS or URANS. Natural TransitionUnder a statistically steady mean flow of low turbulence level, transition in an attached boundary layer is initiated by 2D viscosity-dependent Tollmien-Schlichting instability waves, followed by a 3D instability, leading to formation of spanwise periodic hairpin vortices, which, farther downstream, cause breakdown of the laminar layer with generation of turbulent spots. These spots finally merge resulting in the formation of a turbulent boundary layer [1,2]. This type of transition is called natural transition. It is a rather slow process and, under a very low mean-flow turbulence level, as in external Int.

show abstract

Section: Tests Of Transition Models For Wake-perturbed Inflowmentioning

confidence: 98%

“…Meanwhile, some research groups had reconstructed these functions. Examples are Suluksna et al [120], Sørensen [121] and Piotrowski et al [122].…”

Section: The Local Correlation-based γ-Re θ Modelmentioning

confidence: 99%

Section: Tests Of Transition Models For Wake-perturbed Inflowmentioning

confidence: 99%

See 1 more Smart Citation

Transition Models for Turbomachinery Boundary Layer Flows: A Review

Dick

Kubacki

2017

IJTPP

View full text Add to dashboard Cite

show abstract

“…With [213,214,215,216,217] and a further extension to include the three-dimensional crossflow instability transition phenomenon [218,219,220] before the disclosure of the correlations used by Menter, Langtry and colleagues [183]. Since then improvements have been proposed with mixed succes [221,222].…”

Section: (K-ω Sst) γ − Re θ Modelmentioning

confidence: 99%

“…Choudry et al [ They concluded that the γ − Re θ model performs well for bypass transition, but less for separation-induced transition, as opposed to their model that performs better in the latter case and worse in the former. Piotrowski et al [229,213] compared the PUIM [172,173] and the γ model of Lodefier & Dick [9] with the γ − Re θ model for wake-induced transition on the N3-60 cascade, which showed satisfactory results. Dick & Kubacki [167] compared the γ model, the k − k L − ω, Kubacki et al's model [182] and Kubacki & Dick's model [191] for the same case.…”

Section: Comparative Studiesmentioning

confidence: 99%

On the study of transitional low-Reynolds number flows over airfoils operating at high angles of attack and their prediction using transitional turbulence models

Wauters

Degroote

2018

Progress in Aerospace Sciences

View full text Add to dashboard Cite

In this survey paper transitional turbulence modeling is approached from the point of view relevant to small unmanned aerial vehicles (span ≈ 1m), of which the flow is characterized by very low values of turbulent intensity and transition is predominantly of the separation induced kind. The physical mechanisms that are present during transition are discussed based on the experimental and numerical findings of the last five decades and their influence on high angle of attack behavior, with the appearance of abrupt stall, stall cells, low frequency oscillations and hysteresis are reviewed. Furthermore, an overview will be given of the different methodologies that exist to predict transitional flows. Emphasis will be placed on the modeling of separation bubbles within the RANS-based environment: a number of transitional turbulence models will be summarized and categorized based on their transition predicting methodologies. Four different turbulence models for low Reynolds number flow will be discussed in depth: Menter's k − ω SST model with Wilcox's low-Re modification, Menter & Langtry's (k − ω SST) γ − Re θ model, it's simplified (k − ω SST) γ model and Walters & Cokljat's k − k l − ω model.

show abstract

A One-Equation Local Correlation-Based Transition Model

Menter

Smirnov

Liu

et al. 2015

Flow Turbulence Combust

430

212

View full text Add to dashboard Cite

A model for the prediction of laminar-turbulent transition processes was formulated. It is based on the LCTM ('Local Correlation-based Transition Modelling') concept, where experimental correlations are being integrated into standard convection-diffusion transport equations using local variables. The starting point for the model was the γ -Re θ model already widely used in aerodynamics and turbomachinery CFD applications. Some of the deficiencies of the γ -Re θ model, like the lack of Galilean invariance were removed. Furthermore, the Re θ equation was avoided and the correlations for transition onset prediction have been significantly simplified. The model has been calibrated against a wide range of Falkner-Skan flows and has been applied to a variety of test cases.

show abstract

Transition Prediction on Turbine Blade Profile With Intermittency Transport Equation

Cited by 11 publications

References 11 publications

Transition Models for Turbomachinery Boundary Layer Flows: A Review

Transition Models for Turbomachinery Boundary Layer Flows: A Review

On the study of transitional low-Reynolds number flows over airfoils operating at high angles of attack and their prediction using transitional turbulence models

A One-Equation Local Correlation-Based Transition Model

Contact Info

Product

Resources

About