Differential Methods with Algebraic Turbulence Models

Cebeci, Tuncer

doi:10.1016/b978-0-08-098335-6.00008-2

Cited by 3 publications

(2 citation statements)

References 18 publications

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“…To deal with the turbulent flow, RNG k − ε, and k − ε are the most recent advanced turbulence models that are being employed extensively in hydraulic engineering [27]. Numerical models are highly capable of displaying the flow pattern within and over hydraulic structures, which is occasionally just as significant as flow attributes, in addition to defining hydraulic features [28,29]. Macián-Pérez et al (2020a & 2020b) examined the turbulence models, in relation to the flow behavior in the USBR-II stilling basins.…”

Section: Computational and Modelling Modules Of Ansys Fluent/cfd R 182mentioning

confidence: 99%

3D Numerical Model Validation Using Experimental Test Data for Patrind Hydropower Project

Baluch,

Park,

et al. 2024

Water

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Whilst numerical modelling is commonly used for simulation to check the design of water conveyance, sluicing and spillway structure design, the numerical modelling has rarely been compared with the physical model tests. The objective of this research presented in this paper was to examine the validity and suitability of the numerical computational fluid dynamics (CFD) modeling method within an ANSYS Fluent/CFD R 18.2 software and compare its results with a fully instrumented and well-run physical model test at the 1:45 scale, carried out for Patrind Hydropower Project located in Pakistan. The physical model test was conducted for confirmation and optimization of a natural de-sanding basin, and diversion of suspended sediment-rich flood waters using a bypass tunnel. The numerical simulation was able to reproduce physical model test results and data gathered over a 7-year project operation to an acceptable level of accuracy. A detailed explanation of the approach used in numerical modelling together with analysis of simulation diagrams of ANSYS Fluent/CFD is also presented. The research shows that a 3D numerical model with accurate boundary conditions and mesh size can replace the need for physical model tests.

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Section: Computational and Modelling Modules Of Ansys Fluent/cfd R 182mentioning

confidence: 99%

3D Numerical Model Validation Using Experimental Test Data for Patrind Hydropower Project

Baluch,

Park,

et al. 2024

Water

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“…The transitional (gamma, theta) coupled with the SST model is used to model the unsteady turbulent structures of the flow field. This model is known to be beneficial for predictions of flow separation under adverse pressure gradient (Cebeci, 2004). Furthermore, because of the transition of boundary layer on the rotor surface from laminar to turbulence at the high TSRs, using fully turbulence models result in significant differences between the experimental and the predicted torque values (Mayle, 1991).…”

Section: Problem Descriptionmentioning

confidence: 99%

Numerical modeling of aeroacoustic characteristics of different savonius blade profiles

Delbari

Nejat

Ahmadi

et al. 2019

HFF

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Purpose This study aims to carry out numerical modeling to predict aerodynamic noise radiation from four different Savonius rotor blade profile. Design/methodology/approach Incompressible unsteady reynolds-averaged navier-stokes (URANS) approach using gamma–theta turbulence model is conducted to obtain the time accurate turbulent flow field. The Ffowcs Williams and Hawkings (FW-H) acoustic analogy formulation is used for noise predictions at optimal tip speed ratio (TSR). Findings The mean torque and power coefficients are compared with the experimental data and acceptable agreement is observed. The total and Mono+Dipole noise graphs are presented. A discrete tonal component at low frequencies in all graphs is attributed to the blade passing frequency at the given TSR. According to the noise prediction results, Bach type rotor has the lowest level of noise emission. The effect of TSR on the noise level from the Bach rotor is investigated. A direct relation between angular velocity and the noise emission is found. Practical implications The savonius rotor is a type of vertical axis wind turbines suited for mounting in the vicinity of residential areas. Also, wind turbines wherein operation are efficient sources of tonal and broadband noises and affect the inhabitable environment adversely. Therefore, the acoustic pollution assessment is essential for the installation of wind turbines in residential areas. Originality/value This study aims to investigate the radiated noise level of four common Savonius rotor blade profiles, namely, Bach type, Benesh type, semi-elliptic and conventional. As stated above, numbers of studies exploit the URANS method coupled with the FW-H analogy to predict the aeroacoustics behavior of wind turbines. Therefore, this approach is chosen in this research to deal with the aeroacoustics and aerodynamic calculation of the flow field around the aforementioned Savonius blade profiles. The effect of optimal TSR on the emitted noise and the contribution of thickness, loading and quadrupole sources are of interest in this study.

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Multiphysics Modelling of Fluid Flow Systems

Peksen¹

2018

Multiphysics Modelling

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Differential Methods with Algebraic Turbulence Models

Cited by 3 publications

References 18 publications

3D Numerical Model Validation Using Experimental Test Data for Patrind Hydropower Project

3D Numerical Model Validation Using Experimental Test Data for Patrind Hydropower Project

Numerical modeling of aeroacoustic characteristics of different savonius blade profiles

Multiphysics Modelling of Fluid Flow Systems

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