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Keywords: turbulence
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Proceedings Papers

Proc. ASME. GT2023, Volume 9: Microturbines, Turbochargers, and Small Turbomachines; Oil and Gas Applications, V009T18A003, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-101412
... such as high shear stresses and device-induced turbulence. Although there are multiple references approaching the behavior of these devices both experimentally and numerically, hardly any of them has analyzed the influence of turbulence modeling on the quantification of performance variables. Furthermore...
Proceedings Papers

Proc. ASME. GT2023, Volume 3A: Combustion, Fuels, and Emissions, V03AT04A065, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-102457
..., with a comparison provided. The corresponding differences in emission formation pathways were investigated, alongside high-speed OH* chemiluminescence to further elucidate findings. hydrogen combustion low-emission combustor turbulence fuel combustion Proceedings of ASME Turbo Expo 2023 Turbomachinery...
Proceedings Papers

Proc. ASME. GT2023, Volume 3A: Combustion, Fuels, and Emissions, V03AT04A064, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-102452
... Abstract Renewably generated NH 3 has the potential to support future energy demand, however combustor designs and strategies require considerable development to ensure reduced NO x emissions. Expanding on previous work, a turbulent swirl burner was used to appraise potential NO x reduction...
Proceedings Papers

Proc. ASME. GT2023, Volume 13D: Turbomachinery — Multidisciplinary Design Approaches, Optimization, and Uncertainty Quantification; Radial Turbomachinery Aerodynamics; Unsteady Flows in Turbomachinery, V13DT36A003, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-101135
... and energy equations complemented by the SST turbulence model. The authors applied a quality assessment procedure to the computational results before comparing them to the experimental data and reported the numerical accuracy in the form of the Grid Convergence Index (GCI). The results showed an increase...
Proceedings Papers

Proc. ASME. GT2023, Volume 13D: Turbomachinery — Multidisciplinary Design Approaches, Optimization, and Uncertainty Quantification; Radial Turbomachinery Aerodynamics; Unsteady Flows in Turbomachinery, V13DT36A009, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-101925
... and interacts with the separated boundary layer. Moreover, the backpressure is set to fluctuate at a realistic reduced frequency. The analysis is focused on the coherent component of the flow and more particularly the turbulent stresses in the recirculation region. Phase-averaging is performed in order...
Proceedings Papers

Proc. ASME. GT2023, Volume 3B: Combustion, Fuels, and Emissions, V03BT04A033, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-103232
... chemical kinetic mechanism coupled with detailed transport to solve for turbulence flow scales, both integral and Kolmogorov scales, as well as flame scales. This enables to limit the cost associated with complex chemical mechanisms. The approach is applied here to an atmospheric laboratory-scale...
Proceedings Papers

Proc. ASME. GT2023, Volume 13A: Turbomachinery — Axial Flow Fan and Compressor Aerodynamics, V13AT29A029, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-102633
... Abstract This experimental study characterizes the mean flow structure, distribution of Reynolds stresses, and the mechanisms affecting turbulence production in the entire rotor passage of an axial compressor. The stereo-PIV (Particle Image Velocimetry) measurements are performed in the JHU...
Proceedings Papers

Proc. ASME. GT2023, Volume 13C: Turbomachinery — Deposition, Erosion, Fouling, and Icing; Design Methods and CFD Modeling for Turbomachinery; Ducts, Noise, and Component Interactions, V13CT32A030, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-103064
... the impact on flow physics of interest, such as boundary layer evolution, laminar-to-turbulent transition, and wake shedding. The numerical results show that as Reynolds number is increased, a critical value is reached where the shedding behavior of trailing edge vortices changes, resulting in a jump in wake...
Proceedings Papers

Proc. ASME. GT2023, Volume 13C: Turbomachinery — Deposition, Erosion, Fouling, and Icing; Design Methods and CFD Modeling for Turbomachinery; Ducts, Noise, and Component Interactions, V13CT32A010, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-101238
... Abstract Despite the demonstrated usefulness of RANS for many industrially-relevant problems, it can be challenging to accurately simulate certain flow features with the method. Due to the Reynolds-averaging process, the Reynolds-averaged Navier-Stokes equations require a turbulence model...
Proceedings Papers

Proc. ASME. GT2023, Volume 7B: Heat Transfer — General Interest/Additive Manufacturing Impacts on Heat Transfer; Internal Air Systems; Internal Cooling, V07BT13A005, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-102138
... Abstract Direct numerical simulations of incompressible turbulent forced convection over irregular, anisotropic surface roughness in a pressure-driven plane channel flow have been performed. Heat transfer was simulated by solving the passive scalar transport equation with Prandtl number Pr...
Proceedings Papers

Proc. ASME. GT2022, Volume 10A: Turbomachinery — Axial Flow Fan and Compressor Aerodynamics, V10AT29A010, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-80683
... Abstract The tip region of transonic blades in turbomachinery involves complex flow physics including shock wave/boundary layer interactions (SBLI). SBLI can lead to flow separation, transition from laminar to turbulent flow, and unsteadiness, which can affect the overall performance...
Proceedings Papers

Proc. ASME. GT2022, Volume 10A: Turbomachinery — Axial Flow Fan and Compressor Aerodynamics, V10AT29A009, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-80538
... Abstract Open rotor fan blades, when exercised across a range of operating conditions and design options, present a variety of complex flow physics including leading-edge flow separation, wake evolution and interaction effects, and laminar-to-turbulent transition. In this paper, we present...
Proceedings Papers

Proc. ASME. GT2022, Volume 10C: Turbomachinery — Design Methods and CFD Modeling for Turbomachinery; Ducts, Noise, and Component Interactions, V10CT32A043, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-83376
... at the exit of the prediffuser and the impact that could have on flow split predictions provided to the combustor, Reynold’s stress turbulence models (RSM) are typically used. The combined effort of creating structured meshes, with the difficulty in converging results with RSM can negatively impact design...
Proceedings Papers

Proc. ASME. GT2022, Volume 10D: Turbomachinery — Multidisciplinary Design Approaches, Optimization, and Uncertainty Quantification; Turbomachinery General Interest; Unsteady Flows in Turbomachinery, V10DT37A033, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-83497
... motion case is highly unstable, and anisotropic turbulence occurs. The Reynolds stress components are also investigated to show that vortex breakdown and turbulence characteristics. Besides, two typical Reynolds-averaged Navier-Stokes (RANS) models (Sparlat-Allmaras (SA) model and k-ω shear stress...
Proceedings Papers

Proc. ASME. GT2022, Volume 6B: Heat Transfer — General Interest/Additive Manufacturing Impacts on Heat Transfer; Internal Air Systems; Internal Cooling, V06BT15A021, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-82396
... Abstract The optimal turbulence model to be used in a CFD simulation varies depending on the application and the scientific question at hand. It is always a difficult task to predict which model best represents reality. This study focuses on the internal cooling system of a high-pressure...
Proceedings Papers

Proc. ASME. GT2022, Volume 6B: Heat Transfer — General Interest/Additive Manufacturing Impacts on Heat Transfer; Internal Air Systems; Internal Cooling, V06BT15A005, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-79526
... and heat transfer in a cooling system consisting of a three-pass serpentine with rib turbulators and trailing edge ejection. The cooling geometry is taken from a stator vane currently used in an industrial gas turbine and operates at a coolant inlet Reynolds number of 45,000. As an experimental technique...
Proceedings Papers

Proc. ASME. GT2021, Volume 2A: Turbomachinery — Axial Flow Fan and Compressor Aerodynamics, V02AT31A044, June 7–11, 2021
Publisher: American Society of Mechanical Engineers
Paper No: GT2021-60314
... the S groove. The shear matched facility examine the effect of axial casing grooves layers generated as the flows jet out from the upstream ends of (ACGs) geometry on the turbulence in the tip region of an axial the grooves also bring varying elevated turbulence. At BEP, compressor rotor. The ACGs delay...
Proceedings Papers

Proc. ASME. GT2021, Volume 2C: Turbomachinery — Design Methods and CFD Modeling for Turbomachinery; Ducts, Noise, and Component Interactions, V02CT34A005, June 7–11, 2021
Publisher: American Society of Mechanical Engineers
Paper No: GT2021-58711
... Abstract Engineers performing computational simulations of flow physics are often faced with a trade-off between turn-around time and accuracy. High-fidelity models that can accurately capture small details of flow, such as turbulent mixing, are typically too expensive and are therefore...
Proceedings Papers

Proc. ASME. GT2021, Volume 2C: Turbomachinery — Design Methods and CFD Modeling for Turbomachinery; Ducts, Noise, and Component Interactions, V02CT34A022, June 7–11, 2021
Publisher: American Society of Mechanical Engineers
Paper No: GT2021-59414
... Abstract The aim of this work is an evaluation of different turbulence models applied in Computational Fluid Dynamics (CFD) techniques in the turbomachinery area, in this case, in an axial turbine stage used in turbopump (TP) application. The tip clearance region was considered in this study...