Versatile Tool for Parametric Smooth Turbomachinery Blades

Siddappaji, Kiran; Turner, Mark G.

doi:10.3390/aerospace9090489

Cited by 5 publications

(2 citation statements)

References 57 publications

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“…For example, Siddappaji et al [19,20] demonstrated the dissipation of kinetic energy in unducted rotors. Vorticity-dynamics-based assessment of loss propagation in turbomachinery flows using Spalart-Allmaras turbulence model was also discussed [21,22]. Gao [23] demonstrated budgets for compressor cascade using a two-equation turbulence model.…”

Section: Budget Analysis Of Incompressible and Compressible Flow In O...mentioning

confidence: 99%

Anisotropic Turbulent Kinetic Energy Budgets in Compressible Rectangular Jets

Bhide¹,

Abdallah²

2022

Aerospace

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Turbulence is governed by various mechanisms, such as production, dissipation, diffusion, dilatation and convection, which lead to its evolution and decay. In high-speed flows, turbulence becomes complicated due to compressibility effects. Therefore, the goal of the current work is to characterize these mechanisms in rectangular supersonic jets by directly evaluating their contributions in turbulent kinetic energy (TKE) budget equation. The budgets are obtained using high-fidelity Large Eddy Simulations that employ WALE subgrid-scale model. Jet nearfield data are validated with PIV experimental measurements, available from the literature, which include mean flow and second-order statistics. To ensure spatial resolution and temporal convergence of higher-order statistics, qualitative performance metrics are presented. The results indicate that TKE production is the major source term, while pressure-dilatation term acts as a sink throughout the development of the jet. The diffusion term has the highest contribution from triple-velocity correlations, followed by pressure diffusion and molecular diffusion. Subgrid-scale diffusion and dissipation are also evaluated and their contributions are minimal. Each term is presented on both minor and major axis plane and reveals asymmetry in the statistics. A detailed explanation of budget contributions is provided, leading to the mechanisms responsible for the anisotropy of TKE.

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Section: Budget Analysis Of Incompressible and Compressible Flow In O...mentioning

confidence: 99%

Anisotropic Turbulent Kinetic Energy Budgets in Compressible Rectangular Jets

Bhide¹,

Abdallah²

2022

Aerospace

View full text Add to dashboard Cite

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“…Smooth and parametric geometry creation is essential in a high-fidelity analysis to capture the curvature accurately as demonstrated by Siddappaji et al [27,28] for general turbomachinery in compressible and incompressible flow applications. Good meshing practices, geometry creation and domain creation are equally important for accuracy enhancements as highlighted by Siddappaji et al [29,30].…”

Section: Introductionmentioning

confidence: 99%

High-Order Accurate Numerical Simulation of Supersonic Flow Using RANS and LES Guided by Turbulence Anisotropy

Bhide

Abdallah

2022

Fluids

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This paper discusses accuracy improvements to Reynolds-Averaged Navier–Stokes (RANS) modeling of supersonic flow by assessing a wide range of factors for physics capture. Numerical simulations reveal complex flow behavior resulting from shock and expansion waves and so, a supersonic jet emanating from rectangular nozzle is considered. PIV based experimental data for the jet is available from literature and is used for validation purposes. Effect of various boundary conditions and turbulence modeling approaches is assessed qualitatively and quantitatively. Of particular interest are the inlet conditions considering the turbulence intensity and the effect of upstream air supply duct, the effect of nozzle wall surface roughness on nozzle internal flow and downstream, wall y+ sensitivity for boundary layer resolution and laminar to turbulent transition modeling. In addition to mesh sensitivity, domain dependency is conducted to evaluate the appropriate domain size to capture the kinetic energy dissipation downstream of the nozzle. To further improve the flow characteristics, accounting for the anisotropy of Reynolds stresses is also one of the focuses. Therefore, non-linear eddy viscosity-based two-equation model and Reynolds stress transport model are also investigated. Additionally, the results of baseline linear (Boussinesq) RANS are compared. Corresponding comparisons with high-fidelity LES are presented. Jet self-similar behavior resulting from all simulation fidelities is assessed and it appears that turbulent flow in LES becomes self-similar, but not in RANS. Finally, various factors such as the nozzle geometry and numerical modeling choices influencing the anisotropy in jet turbulence are discussed.

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A novel generative approach to the parametric design and multi-objective optimization of horizontal axis tidal turbines

Xia,

Wang,

et al. 2024

Physics of Fluids

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As the demand for ocean energy continues to grow, the development of efficient design and optimization methods for tidal current turbines is crucial. Traditional approaches, often based on parameterized models, face challenges in fully capturing the intricate geometric features of turbine blades, limiting the optimization space and affecting convergence efficiency. In response, this study introduces a novel design methodology for horizontal axis tidal turbines (HATTs) using a variational autoencoder generative adversarial network (VAEGAN) model. This approach uses unsupervised learning from a custom dataset to generate new HATT designs, with the VAEGAN model encoding distinct geometric features of turbine blades within a compact latent space, enabling more efficient design space exploration and facilitating the discovery of innovative shapes. Furthermore, in the multi-objective optimization process targeting both hydrodynamic performance and structural strength, the reduced dimensionality of the design variables accelerates convergence while maintaining a broad and meaningful design space. The proposed methodology demonstrates the VAEGAN model's ability to generate diverse and effective turbine blade designs, highlighting its potential as a powerful tool in advancing HATT technology.

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Versatile Tool for Parametric Smooth Turbomachinery Blades

Cited by 5 publications

References 57 publications

Anisotropic Turbulent Kinetic Energy Budgets in Compressible Rectangular Jets

Anisotropic Turbulent Kinetic Energy Budgets in Compressible Rectangular Jets

High-Order Accurate Numerical Simulation of Supersonic Flow Using RANS and LES Guided by Turbulence Anisotropy

A novel generative approach to the parametric design and multi-objective optimization of horizontal axis tidal turbines

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