Results 21 to 30 of about 50 (50)

A Three Equation Curvature and Rotation Sensitive Variant of the SST K-Omega Turbulence Model

ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting: Volume 1, Symposia – Parts A, B, and C, 2010
To date, eddy viscosity models are the most accepted and widely used RANS-based turbulence closures, attributable to their computational efficiency and relative robustness. One notable shortcoming of these models is their insensitivity to system rotation and streamline curvature.
D. Keith Walters, Tej P. Dhakal
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Tuning of Generalized K-Omega Turbulence Model by Using Adjoint Optimization and Machine Learning for Gas Turbine Combustor Applications

Volume 3B: Combustion, Fuels, and Emissions, 2023
Abstract For swirl-stabilized gas turbine combustors, turbulence modelling is generally undertaken using Scale-Resolved Simulations (SRS) methods such as Large Eddy Simulations (LES). However, LES is expensive due to large mesh sizes and small time-step size required to estimate the correct large-scale turbulence motion generated within ...
George Klavaris, Min Xu, Chris Hill, Florian Menter, Saurabh Patwardhan, Ishan Verma   +5 more
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The Anisotropic Hybrid k-$$\omega $$ SST/Stochastic Turbulence Model

2020
This chapter focuses on a brief summary of the mathematical formulation of the anisotropic hybrid k-\(\omega \) Shear-Stress Transport (SST)/Stochastic Turbulence Model (STM) related to a new hypothesis on the Reynolds stress tensor (2.41) proposed in the first volume of this book [17]. The mathematical formulation of the anisotropic hybrid k-\(\omega \
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Four equation k-omega based turbulence model with algebraic flux for supercritical flows

Annals of Nuclear Energy, 2019
Abstract Hydrocarbon and nuclear fuels will contribute substantially to the growing global energy portfolio for some time to come. At the same time atmospheric carbon levels and economic concerns are increasingly shaping the power generation environment. Supercritical fluid technologies are being investigated to address both concerns.
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Testing and Modeling of Generalized K-Omega Turbulence Model and Validation on Highly Efficient Centrifugal Compressor (HECC)

ASME 2023 Gas Turbine India Conference, 2023
Abstract The paper outlines the CFD study carried out on the Highly Efficient Centrifugal Compressor (HECC) consisting of three blade rows which are an Impeller (main blade/splitter blade), a Diffuser (main/splitter vane) and a Deswirl.
Shivani Ranjan, Shailesh Kumar, Mohammed Qizar, Mahmoud Mansour   +3 more
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A numerical investigation of the turbulent flow around a scale model JBC hull using the Generalized k-omega (GEKO) turbulence model

2019
In this investigation, qualitative comparisons with experimentally obtained PIV data from a scale-model wind tunnel facility are made with numerical solutions obtained using CFD for the Japan Bulk Carrier (JBC) geometry. Distributions of relevant quantities such as local velocity, local vorticity and local turbulence quantities at specific locations in
Sharkey, P. S., Menter, F. R.
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Machine-Learning Assisted Optimization of Generalized K-Omega (GEKO) Turbulence Model Parameters for Turbocharger Radial Compressor

Volume 10D: Turbomachinery — Multidisciplinary Design Approaches, Optimization, and Uncertainty Quantification; Turbomachinery General Interest; Unsteady Flows in Turbomachinery, 2022
Abstract This paper presents a complete and general machine-learning assisted optimization framework for the Generalized k-ω (GEKO) turbulence model based on experimental measurements. The optimization framework is applied to the use case of a turbocharger radial compressor for three different operating conditions including design and ...
Patrick Amstad, Kwok Kai So, Magnus Fischer   +2 more
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The k- $$\omega $$ ω Shear-Stress Transport (SST) Turbulence Model

2019
This chapter focuses on the mathematical formulations of the turbulent kinetic energy k and specific dissipation rate \(\omega \) Shear-Stress Transport (SST) turbulence model proposed by Menter [3, 4] to provide a closure model to the Boussinesq-type counterparts of the new hypothesis on the anisotropic Reynolds stress tensor discussed in Chap. 5. The
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A new extension for k– turbulence models to account for wall roughness

International Journal of Heat and Fluid Flow, 2009
Abstract This paper presents a new extension for k– ω turbulence models to account for surface roughness for transitionally and fully rough surfaces. It is based on the equivalent sand grain approach and accounts for theoretical considerations on the log-layer solution for fully rough surfaces.
Knopp, Tobias, Eisfeld, Bernhard, Bartolome Calvo, Javier   +2 more
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Analysis of Supersonic Turbulent Boundary Layers Over Rough Surfaces Using the K-Omega and Stress-Omega Models

Volume 2: Fora, 2005
In this study, the influence of surface roughness in the prediction of the mean flow and turbulent properties of a high-speed supersonic (M = 2.9, Re/m = 2.0e7) turbulent boundary layer flow over a flat plate is performed using the k-ω and the stress-ω models.
Muhammad A. R. Sharif, Guanghong Guo
openaire   +2 more sources