Turbulence and Combustion

A special issue of Fluids (ISSN 2311-5521). This special issue belongs to the section "Turbulence".

Deadline for manuscript submissions: 31 July 2024 | Viewed by 1586

Special Issue Editors


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Guest Editor
School of Engineering, Newcastle University, Newcastle-upon-Tyne NE1 7RU, UK
Interests: computational fluid dynamics; turbulent flows; turbulent combustion; heat transfer; non-newtonian fluids; multiphase flows
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Guest Editor
School of Engineering, Newcastle University, Claremont Road, Newcastle Upon Tyne NE1 7RU, UK
Interests: turbulence; combustion; non-newtonian fluids; heat transfer; computational fluid dynamics

Special Issue Information

Dear Colleagues,

The analysis and modelling of turbulent and reacting flows are important and intractable challenges that cross disciplinary boundaries. Due to the increase in industrial needs for accuracy, and as applications expand beyond flows where extensive data are available, the necessity for better simulation and experimental techniques is becoming increasingly important. The problems related to understanding turbulent flows are exacerbated by the introduction of heat release in turbulent reacting flows, consequently making the already intractable problem of turbulence more complex, as the underlying turbulence is significantly affected by the steep density gradients caused by the exothermic chemical reactions. This Special Issue is directed at the crossroads of rigorous experimental and numerical analysis for understanding flows involving turbulence and combustion, the physics of turbulence and combustion and the improvements in experimental and simulations techniques used in understanding turbulence and combustion.

Prof. Dr. Nilanjan Chakraborty
Dr. Umair Ahmed
Guest Editors

Manuscript Submission Information

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Keywords

  • Reynolds Averaged Navier-Stokes (RANS) simulations
  • Large Eddy Simulations (LES)
  • Direct Numerical Simulations (DNS)
  • premixed combustion
  • non-premixed combustion
  • flame-wall interaction
  • experimental turbulence
  • turbulence modelling
  • combustion modelling

Published Papers (1 paper)

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Research

24 pages, 9812 KiB  
Article
Vortex-Breakdown Efficiency of Planar Regular Grid Structures—Towards the Development of Design Guidelines
by Julien Sirois, Marlène Sanjosé, Fabian Sanchez and Vladimir Brailovski
Fluids 2024, 9(2), 43; https://doi.org/10.3390/fluids9020043 - 8 Feb 2024
Viewed by 1290
Abstract
The work presented here aims to provide design guidelines to create vortex-damping structures. A design of experiment was developed to investigate the individual and combined effects of the geometrical properties of planar regular grid structures, i.e., the wire diameter, the porosity, and the [...] Read more.
The work presented here aims to provide design guidelines to create vortex-damping structures. A design of experiment was developed to investigate the individual and combined effects of the geometrical properties of planar regular grid structures, i.e., the wire diameter, the porosity, and the inter-grid spacing, on their vortex-breakdown performance. The simulations were carried out using a commercial unsteady RANS solver. The model relies on the Von Karman street effect to generate vortices in a pipe which are convected downstream, where they interact with an array of grids. The vortex-breakdown efficiency is characterized by the pressure drop, the residual turbulent kinetic energy, the flow homogeneity, and the size of the transmitted vortices. The wire diameter is shown to be an important design lever as it affects the level of distortion of the transmitted vortices. Increasing the number of grids augments the pressure loss, but their contribution to vortex breakdown is otherwise limited when the wire diameter is small. The influence of grid spacing strongly depends on the wire diameter and grid alignment. For instance, minimizing this gap reduces the pressure drop for the inline configurations, but increases the pressure drop for the offset configurations. Full article
(This article belongs to the Special Issue Turbulence and Combustion)
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