Design criteria for a type of asymmetric orifice in a surge tank using CFD

Gabl, Roman; Righetti, Maurizio

doi:10.1080/19942060.2018.1443837

Cited by 15 publications

(20 citation statements)

References 34 publications

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“…For a number of significant environmental problems, successfully performed the numerical study (Gabl & Righetti, 2018;Lepikhin, Lyubimova, Parshakova, & Tiunov, 2012;Lyubimova, Lepikhin, Parshakova, & Tiunov, 2016;Lyubimova, Lepikhin, Parshakova, Konovalov, & Tiunov, 2014;Lyubimova, Lepikhin, Tsiberkin, & Parshakova, 2014;Quezada, Tamburrino, & Niño, 2018;Wu & Chau, 2006), it was confirmed that it allows quickly obtain the necessary information about the ecosystem state, which allows for effective power plants control and, in general, to prevent technological and environmental risks of the region.…”

Section: Introductionmentioning

confidence: 90%

Numerical simulation of thermal pollution zones’ formations in the water environment from the activities of the power plant

Issakhov

Zhandaulet

2019

Engineering Applications of Computational Fluid Mechanics

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In this paper, obtained numerical results of the thermal pollution from the operation of a power plant are presented when using the Irtysh River as a natural water cooling system. A two-dimensional formulation by using the "shallow water" approximation is often used as a numerical solution of such problems. For two-dimensional numerical modeling, it is possible to determine the floating flow together with its characteristics of mixing heated water discharge from lateral projections to transverse flow. Furthermore, data from the experiment and numerical values of other authors were used in order to check the conformity of the computational results. The obtained numerical values gave good agreement comparing with data from the experiment, specially the jets trajectory, the recirculation zones size and the dimensionless excess temperature distribution. The obtained data as a result of numerical simulation can be used to study problems associated with the mixing of heated water discharged from the lateral direction into the transverse flow. Also these studies were conducted to study thermal contamination under different scenarios, the impact of heated water discharge from a power plant in the Irtysh River, and the areas of thermal pollution for different velocity scenarios were determined. ARTICLE HISTORY KEYWORDS Navier-Stokes equation;operational capacities of the power plant; finite volume method; the SIMPLE algorithm; thermal discharge; heat exchange

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Section: Introductionmentioning

confidence: 90%

Numerical simulation of thermal pollution zones’ formations in the water environment from the activities of the power plant

Issakhov

Zhandaulet

2019

Engineering Applications of Computational Fluid Mechanics

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“…Three-dimensional flow simulations were performed using the Ansys CFX software, which uses the finite volume method (Ansys Inc., 2013) and has a history of successful use for CFD simulations of various hydraulic structures (Arantes, 2007;Arantes et al, 2010;Dettmer et al, 2013;Gabl & Righetti, 2018;Sanagiotto et al, 2019aSanagiotto et al, , 2019b.…”

Section: Numerical Modeling and Governing Equationsmentioning

confidence: 99%

Combination of experimental and numerical approaches to determine the main characteristics of skimming flow in stepped spillways

Tassinari

Sanagiotto

Marques

et al. 2020

RBRH

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The traditional approach for the hydrodynamic characterization of the flow down stepped spillways is through physical modeling, which is susceptible to scale effects and has limitations related to experimental apparatus, laboratory space and the spatial discretization of data collection. Computational fluid dynamics (CFD) is an important tool for hydrodynamic analysis because, if used properly, it presents great potential for application in hydraulics. In this work, CFD was used to model the skimming flow down a stepped spillway to investigate the effects of possible pressure measurement errors due to uncertainties in the position of the sensors within the steps. The numerical model was validated through literature velocity profiles and pressure experimental data. The results showed that the best values of water fraction (α) to define free surface are α = 0.30 in the nonaerated region and α = 0.10 in the aerated region. Statistical parameters were calculated using experimental data to estimate extreme pressures. These parameters and the simulation results were used to determine that the extreme maximum and minimum pressures occur, respectively, in the region of 0.81 < x/l < 0.98, in the horizontal faces, and in the region of 0.93 < y/h < 0.98, in the vertical faces.

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“…This commercial software package is well validated and has a wide area of application. Examples of successful usage of this 3D-numerical code are the optimisation of turbine [35][36][37], intake structures [38,39], spillways [40], water-jet turbines [41], surge tank throttles [42], swirl generating devices [43] and also heat flux in photovoltaic system [44]. Key reasons for this decision are the adaptable post-processing as well as the very flexible meshing, which allows to include all needed details of the geometry in the spatial discretization.…”

Section: Numericsmentioning

confidence: 99%

“…This value is used to define the location of the second cross section in the laboratory model [42] as part of the preliminary phase of the project (Section 2.1). A typical α-value for a turbulent velocity distribution in a pipe is in the range of 1 (uniform constant velocity distribution) and 2 for laminar condition (parabolic distribution) [3,52].…”

Section: Local Head Lossmentioning

confidence: 99%

Adaptation of an Existing Intake Structure Caused by Increased Sediment Level

Gabl

Gems

Birkner

et al. 2018

Water

Self Cite

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An unexpected and massive redistribution of fine sediment in a large Alpine reservoir was triggered by a further lowering of the water level to conduct maintenance work. This caused the need of a total redesign of the existing head race intake for a high head power plant in the Austrian Alps. Two main geometry options for the trash rack support structure are compared with numerical simulations (ANSYS-CFX) as well as with a scale model test (scale 1:20). The laboratory experiment substantially benefited from the preliminary numerical investigation in respect of the location and implementation of the model boundaries. In return was the confidence in the numerics strengthened by the successful validation of the local head loss and the velocity distribution for the main operation cases. This allowed that the main inputs for the structural design and the further optimisation is conducted only with the 3D-numerical tool. The paper presents the interlaced concept as well as the main finding of the investigation, which lead to a successful adaptation of the intake structure.

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Design criteria for a type of asymmetric orifice in a surge tank using CFD

Cited by 15 publications

References 34 publications

Numerical simulation of thermal pollution zones’ formations in the water environment from the activities of the power plant

Numerical simulation of thermal pollution zones’ formations in the water environment from the activities of the power plant

Combination of experimental and numerical approaches to determine the main characteristics of skimming flow in stepped spillways

Adaptation of an Existing Intake Structure Caused by Increased Sediment Level

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