Correlation-Based Transition Modeling for Unstructured Parallelized Computational Fluid Dynamics Codes

Langtry, Robin; Menter, F. R.

doi:10.2514/1.42362

Cited by 1,187 publications

(797 citation statements)

References 23 publications

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“…[17][18][19][20], and it is considered to be the state of the art [21]. More specifically, Langtry [17] validated CFX with the γ-Reθ model on computing the flowfield around a double-circular airfoil, and Korakianitis [14] used the software FLUENT with the γ-Reθ model in his curvature-based blade optimization system. Marciniak [21] validated the ability of γ-Reθ model on predicting the performance of a CDA profile.…”

Section: Objects and Numerical Methodsmentioning

confidence: 99%

Numerical and Theoretical Investigations Concerning the Continuous-Surface-Curvature Effect in Compressor Blades

Song

Xiao

2014

Energies

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Though the importance of curvature continuity on compressor blade performances has been realized, there are two major questions that need to be solved, i.e., the respective effects of curvature continuity at the leading-edge blend point and the main surface, and the contradiction between the traditional theory and experimental observations in the effect of those novel leading-edge shapes with smaller curvature discontinuity and sharper nose. In this paper, an optimization method to design continuous-curvature blade profiles which deviate little from datum blades is proposed, and numerical and theoretical analysis is carried out to investigate the continuous-curvature effect on blade performances. The results show that the curvature continuity at the leading-edge blend point helps to eliminate the separation bubble, thus improving the blade performance. The main-surface curvature continuity is also beneficial, although its effects are much smaller than those of the blend-point curvature continuity. Furthermore, it is observed that there exist two factors controlling the leading-edge spike, i.e., the curvature discontinuity at the blend point which dominates at small incidences, and the nose curvature which dominates at large incidences. To the authors' knowledge, such mechanisms have not been reported before, and they can help to solve the sharp-leading-edge paradox. OPEN ACCESSEnergies 2014, 7 8151

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Section: Objects and Numerical Methodsmentioning

confidence: 99%

Numerical and Theoretical Investigations Concerning the Continuous-Surface-Curvature Effect in Compressor Blades

Song

Xiao

2014

Energies

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“…As shall be discussed later on, a more engineering-oriented approach was developed based on empirical approach, as proposed by Langtry & Menter (2009), Menter, Langtry & Volker (2006. In this Local Correlation Transition Model (LCTM), a framework for empirical correlations obtained from experiments is set and coupled with a turbulence model in order to predict transition onset and length.…”

Section: List Of Figuresmentioning

confidence: 99%

“…In this Local Correlation Transition Model (LCTM), a framework for empirical correlations obtained from experiments is set and coupled with a turbulence model in order to predict transition onset and length. In fact, Langtry & Menter (2009) have shown results for different applications, including few results for the cylinder flow in the drag crisis region, but without assessment of numerical errors or much exploration of modeling issues. Quite a reasonable improvement is observed compared to traditional modeling.…”

Section: List Of Figuresmentioning

confidence: 99%

“…In the present work, the LCTM presented by Langtry & Menter (2009) is used in the framework of ReFRESCO. As Menter, Langtry & Volker (2006) mention, the cornerstone of this approach is that the concept of strain rate Reynolds number can provide the connection between the transition onset Reynolds number and empirical correlations to obtain the local boundary-layer quantities.…”

Section: Transition Modelingmentioning

confidence: 99%

“…In order to broaden the applicability of the model to different types of flows, Langtry & Menter (2009) have scaled Re v in a Blasius boundary layer such that, at its maximum, it reaches unity. The scaling is performed by means of the Reynolds momentum thickness, Re θ , that is, the Reynolds number calculated with the momentum thickness θ.…”

Section: Transition Modelingmentioning

confidence: 99%

See 2 more Smart Citations

Desenvolvimento da modelagem de turbulência e interação fluido-estrutura para as vibrações induzidas por vórtices de cilindro rígido.

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Computational fluid dynamics simulation of pressure drop and macromixing in LL microreactors

et al. 2021

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A computational fluid dynamics (CFD) model was developed to simulate single‐phase flow in LL microreactors using the open‐source software OpenFOAM. The k‐ω SSTLM turbulence model was implemented to account for the impact of small‐scale temporal and spatial fluctuations that emerge in the base LL mixing module (LLM) on the flow field and transport of a passive scalar. The CFD model was successfully validated based on excellent conformance to experimental pressure loss (R2 > 0.997) and residence time distribution (RTD) data (R2 > 0.97) at flow rates ranging from 10‐100 g/min. Streamlines, velocity, pressure, and turbulent viscosity profiles were mapped across the 3D domain of repeating reactor segments to analyze local fluid dynamics. In a continuous series of LLMs, the flow field becomes fully developed after the second module. A drastic change in flow behaviour in the LLM was identified at 30 g/min (Re = 643) based on the emergence of advective recirculation zones and significant turbulent dispersion. Recirculation zones in the LLM grow larger from 20‐50 g/min and are equal in size from 50‐100 g/min. Four LL reactor plates with differing configurations of spacing between LLMs were compared extensively by analyzing pressure drop and RTD. Plates with continuous or equally‐spaced LLMs demonstrated a near plug‐flow profile with minor dispersion (Pe > 100), albeit at a greater power dissipation. Plates with longer residence‐time channels between LLMs yielded a broader and right‐skewed RTD due to the intermittent attenuation of chaotic flow patterns.

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Correlation-Based Transition Modeling for Unstructured Parallelized Computational Fluid Dynamics Codes

Cited by 1,187 publications

References 23 publications

Numerical and Theoretical Investigations Concerning the Continuous-Surface-Curvature Effect in Compressor Blades

Numerical and Theoretical Investigations Concerning the Continuous-Surface-Curvature Effect in Compressor Blades

Desenvolvimento da modelagem de turbulência e interação fluido-estrutura para as vibrações induzidas por vórtices de cilindro rígido.

Computational fluid dynamics simulation of pressure drop and macromixing in LL microreactors

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