Turbulence Modeling Using Z-F Model and RSM for Flow Analysis in Z-SHAPE Ducts

Karbon, Mohammed; Sleiti, Ahmad K.

doi:10.1155/2020/4854837

Cited by 4 publications

(3 citation statements)

References 39 publications

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“…Another turbulence model used, similar to the k-ε model, is k-ζ-f, which provides a good balance between computational cost and the accuracy of the results due to the particularities of the ζ term modeling [40]. According to [40], both RANS with RSM and the k-ζ-f model produce reasonable results with a good accuracy in resolving the dominant structures of the turbulent flow. In comparison with LES, the k-ζ-f model has a better advantage in managing computational cost efficiency, even compared with the RSM, which it is 20% faster than.…”

Section: Reynolod-average Navier-stokes Formalism and Turbulence Modelmentioning

confidence: 99%

“…In comparison with LES, the k-ζ-f model has a better advantage in managing computational cost efficiency, even compared with the RSM, which it is 20% faster than. Regarding the two RANS models, paper [40] showed that the k-ζ-f model provides a better prediction of flow separation and reattachment. The k-ζ-f model has been developed by Hanjalic, Popovac and Hadziabdic [27].…”

Section: Reynolod-average Navier-stokes Formalism and Turbulence Modelmentioning

confidence: 99%

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Investigation of the Aerodynamic Performance of the Miller Cycle from Transparent Engine Experiments and CFD Simulations

et al. 2022

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This paper assesses the effect of the Miller cycle upon the internal aerodynamics of a motored transparent spark ignition engine via CFD simulation and particle image velocimetry. Since the transparent Miller engine does not allow for measurements in the roof of the combustion chamber, the extraction of information regarding the aerodynamic phenomena occurring here is based on CFD simulation, i.e., the results of the CFD simulation are used to allow for the extrapolation of the experimental data; thus, they are used to complete the picture regarding the aerodynamic phenomena occurring inside the whole cylinder. The results indicate that implementing the early intake valve closing strategy to obtain the Miller cycle has a negative impact on the mean kinetic energy, turbulent kinetic energy, and fluctuating velocity toward the end of the compression stroke, thus affecting, the combustion process. This supports the need to intensify the internal aerodynamics when applying the Miller cycle such that the turbulence degradation is not too big and, consequently, to still gain efficiency in the Miller cycle.

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Section: Reynolod-average Navier-stokes Formalism and Turbulence Modelmentioning

confidence: 99%

Section: Reynolod-average Navier-stokes Formalism and Turbulence Modelmentioning

confidence: 99%

Investigation of the Aerodynamic Performance of the Miller Cycle from Transparent Engine Experiments and CFD Simulations

et al. 2022

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“…Turbulent flow in Z-shape duct configuration is investigated using Reynolds stress model (RSM) and ζ-f model and compared to experimental results [10]. Both RSM and ζ-f models are based on steady-state RANS solutions.…”

Section: Figure 1 the Uniform Velocity Profile For The Transition Bementioning

confidence: 99%

Turbulence Modeling a Review for Different Used Methods

Hami¹

2021

IJHT

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This contribution represents a critical view of the advantages and limits of the set of mathematical models of the physical phenomena of turbulence. Turbulence models can be grouped into two categories, depending on how turbulent quantities are calculated: direct numerical simulations (DNS) and RANS (Reynolds Averaged Navier-Stokes Equations) models. The disadvantage of these models is that they require enormous computing power, inaccessible, especially for large and complicated geometries. For this reason, hybrid models (combinations between DNS and RANS methods) have been developed, for example, the LES (“Large Eddy Simulation”) or DES (“Detached Eddy Simulation”) models. They represent a compromise - are less precise than DNS, but more precise than RANS models. The results presented in this contribution will allow and facilitate future research in the field the choice of the model approach necessary for the case studies whatever their difficulty factor.

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A Comparative Study on 2D CFD Simulation of Flow Structure in an Open Channel with an Emerged Vegetation Patch Based on Different RANS Turbulence Models

Dai

Zhai

et al. 2022

Water

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Aquatic plants widely exist in rivers, which can affect the flow structure in rivers and have an important impact on the evolution of river morphology. The emerged vegetation is an important member of aquatic vegetation in the river, so studying the flow structure around the emerged vegetation patches is of great significance. Computational fluid dynamics (CFD) simulation provides support for the related research works. Applying the appropriate turbulence model is crucial to achieving realistic numerical simulation results. In this study, two-dimensional numerical simulations were carried out and compared with experimental data by six different Reynolds-Averaged Navier–Stokes (RANS) turbulence models, i.e., Standard k-ε model, Renormalization group (RNG) k-ε model, Realizable k-ε model, Standard k-ω model, Shear-stress transport (SST) k-ω Model, and the Reynolds stress model (RSM). CFD is an effective research method, and the results showed that there are different simulation performances with different turbulence models. The shear stress transport k-ω model achieves the most consistent numerical simulation results with the experimental data for the longitudinal mean flow velocity distribution at the centerline, and the Reynolds stress model provides the least consistent numerical simulation with the experimental data. Then the performance of the six models in simulating the flow field characteristics and longitudinal outflow after vegetation patch was compared.

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Turbulence Modeling Using Z-F Model and RSM for Flow Analysis in Z-SHAPE Ducts

Cited by 4 publications

References 39 publications

Investigation of the Aerodynamic Performance of the Miller Cycle from Transparent Engine Experiments and CFD Simulations

Investigation of the Aerodynamic Performance of the Miller Cycle from Transparent Engine Experiments and CFD Simulations

Turbulence Modeling a Review for Different Used Methods

A Comparative Study on 2D CFD Simulation of Flow Structure in an Open Channel with an Emerged Vegetation Patch Based on Different RANS Turbulence Models

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