LES study of grid-generated turbulent inflow conditions with moderate number of mesh cells at low Re numbers

Torrano, I.; Martinez‐Agirre, Manex; Tutar, Mustafa

doi:10.1080/10618562.2016.1167195

International Journal of Computational Fluid Dynamics

2016

DOI: 10.1080/10618562.2016.1167195

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LES study of grid-generated turbulent inflow conditions with moderate number of mesh cells at low Re numbers

I. Torrano

Manex Martinez‐Agirre

Mustafa Tutar

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Cited by 3 publications

References 26 publications

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Heat and fluid flow of a circular cylinder placed close to a turbulence-generating grid

Abdelhady

2023

Physics of Fluids

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The heat and fluid flow of a circular cylinder placed in the wake of a turbulence-generating grid are studied using large eddy simulations at a Reynolds number of 3900 and a Prandtl number of 0.7. The investigation focused on the wake of the cylinder and compared the results to a uniform inflow case to assess the impact of the highly anisotropic-nonhomogeneous grid-generated turbulence on the cylinder heat and fluid flow. Phase-averaging and spectral proper orthogonal decomposition were applied to analyze the coherent heat and fluid flow fields. The following are the main findings of the cylinder experiencing turbulent inflow, relative to the uniform free-stream case: (i) a highly three-dimensional mean heat and fluid flow, (ii) a 40% shorter recirculation length, (iii) a wake dominated by shedding vortices having lower magnitudes of fluctuations than the uniform inflow case, (iv) delay in flow separation from 87° to 97°, (v) break of the correlation between the wake shedding flow and the flow field at the cylinder front face, (vi) 39% enhancement in the overall Nusselt number, (vii) 100% increase in the local Nusselt number at the rear stagnation point, (viii) higher local heat transfer rate that varies substantially along the span before flow separation, (ix) significantly higher lift force reflected in a 3.7× root mean square lift coefficient and a phase-averaged lift coefficient having a maximum amplitude that is 7×, and (x) an increase in the magnitudes of the advection and production terms of the coherent heat and fluid flow transport equations, especially around the forward and rear stagnation regions.

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Heat and fluid flow of a circular cylinder placed close to a turbulence-generating grid

Abdelhady

2023

Physics of Fluids

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Evaluating the Impact of Free-Stream Turbulence on Convective Cooling of Overhead Conductors Using Large Eddy Simulations

Abdelhady

Wood

2019

Journal of Energy Resources Technology

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The international trend of using renewable energy sources for generating electricity is increasing, partly through harvesting energy from wind turbines. Increasing electric power transmission efficiency is achievable through using real-time weather data for power line rating, known as real-time thermal rating (RTTR), instead of using the worst case scenario weather data, known as static rating. RTTR is particularly important for wind turbine connections to the grid, as wind power output and overhead conductor rating both increase with increasing wind speed, which should significantly increase real-time rated conductor from that of statically rated. Part of the real-time weather data is the effect of free-stream turbulence, which is not considered by the commonly used overhead conductor codes, Institute of Electrical and Electronics Engineers (IEEE) 738 and International Council on Large Electric Systems (CIGRÉ) 207. This study aims to assess the effect free-stream turbulence on IEEE 738 and CIGRÉ 207 forced cooling term. The study uses large eddy simulation (LES) in the ANSYS fluent software. The analysis is done for low wind speed, corresponding to Reynolds number of 3000. The primary goal is to calculate Nusselt number for cylindrical conductors with free-stream turbulence. Calculations showed an increase in convective heat transfer from the low turbulence value by ∼30% at turbulence intensity of 21% and length scale to diameter ratio of 0.4; an increase of ∼19% at turbulence intensity of 8% and length scale to diameter ratio of 0.4; and an increase of ∼15% at turbulence intensity of 6% and length scale to diameter ratio of 0.6.

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Analysis of Flow Field Characteristics under the Combined Action of IEC Gust Wind and Turbulence

周¹

2020

MOS

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LES study of grid-generated turbulent inflow conditions with moderate number of mesh cells at low Re numbers

Cited by 3 publications

References 26 publications

Heat and fluid flow of a circular cylinder placed close to a turbulence-generating grid

Heat and fluid flow of a circular cylinder placed close to a turbulence-generating grid

Evaluating the Impact of Free-Stream Turbulence on Convective Cooling of Overhead Conductors Using Large Eddy Simulations

Analysis of Flow Field Characteristics under the Combined Action of IEC Gust Wind and Turbulence

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