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Browsing publications by Dr Umair Ahmed.

Newcastle AuthorsTitleYearFull text
Dr Jiawei Lai
Dr Umair Ahmed
Dr Markus Klein
Professor Nilanjan Chakraborty
A comparison between head-on quenching of stoichiometric methane-air and hydrogen-air premixed flames using Direct Numerical Simulations2022
Peter Brearley
Dr Umair Ahmed
Professor Nilanjan Chakraborty
A priori Direct Numerical Simulation analysis of the closure of cross-scalar dissipation rate of reaction progress variable and mixture fraction in turbulent stratified flames2022
Professor Nilanjan Chakraborty
Dr Umair Ahmed
Dr Markus Klein
Alignment statistics of pressure Hessian with strain rate tensor and reactive scalar gradient in turbulent premixed flames2022
Dr Umair Ahmed
Dr Jian Fang
Professor Nilanjan Chakraborty
An unstructured Adaptive Mesh Refinement approach for Computational Fluid Dynamics of reacting flows2022
Hazem Awad
Dr Khalil Abo Amsha
Dr Umair Ahmed
Dr Markus Klein
Professor Nilanjan Chakraborty
et al.
Assessment of Damköhler’s hypotheses in the thin reaction zones regime using multi-step chemistry Direct Numerical Simulations of statistically planar turbulent premixed flames2022
Arun Varma
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Effects of body force on the statistical behaviour and modelling of scalar variance in turbulent premixed flames2022
Arun Varma
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Effects of body forces on the statistics of flame surface density and its evolution in statistically planar turbulent premixed flames2022
Arun Varma
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Effects of Body Forces on Turbulent Kinetic Energy Transport in Premixed Flames2022
Arun Varma
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Effects of buoyancy on turbulent scalar flux closure for turbulent premixed flames in the context of Reynolds Averaged Navier–Stokes simulations2022
Dr Sanjeev Ghai
Dr Umair Ahmed
Dr Markus Klein
Professor Nilanjan Chakraborty
Energy integral equation for premixed flame-wall interaction in turbulent boundary layers and its application to turbulent burning velocity and wall flux evaluations2022
Dr Sanjeev Ghai
Professor Nilanjan Chakraborty
Dr Umair Ahmed
Dr Markus Klein
Enstrophy evolution during head-on wall interaction of premixed flames within turbulent boundary layers2022
Dr Sanjeev Ghai
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Dr Markus Klein
Entropy generation during head-on interaction of premixed flames with inert walls within turbulent boundary layers2022
Professor Nilanjan Chakraborty
Dr Umair Ahmed
Dr Markus Klein
Relations between statistics of three-dimensional flame curvature and its two-dimensional counterpart in turbulent premixed flames2022
Peter Brearley
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Scalar Forcing Methodology for Direct Numerical Simulations of Turbulent Stratified Mixture Combustion2022
Dr Umair Ahmed
Dr Sanjeev Ghai
Professor Nilanjan Chakraborty
Dr Markus Klein
Scalar statistics in premixed flame-wall interaction within turbulent boundary layers under different flow configurations2022
Dr Sanjeev Ghai
Dr Umair Ahmed
Dr Markus Klein
Professor Nilanjan Chakraborty
Turbulent kinetic energy evolution in turbulent boundary layers during head-on interaction of premixed flames with inert walls for different thermal boundary conditions2022
Peter Brearley
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Turbulent stratified mixture combustion with numerically forced bimodal mixture inhomogeneity2022
Dr Jiawei Lai
Dr Umair Ahmed
Dr Markus Klein
Professor Nilanjan Chakraborty
A comparison between head-on quenching of turbulent methane-air and hydrogen-air flames using detailed chemistry Direct Numerical Simulations2021
Peter Brearley
Dr Umair Ahmed
Professor Nilanjan Chakraborty
A-priori Direct Numerical Simulation evaluation of the cross-scalar dissipation rate of reaction progress variable and mixture fraction in turbulent stratified flames2021
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Dr Markus Klein
Assessment of Bray Moss Libby formulation for premixed flame-wall interaction within turbulent boundary layers: Influence of flow configuration2021
Professor Nilanjan Chakraborty
Anthony Herbert
Dr Umair Ahmed
Dr Markus Klein
Assessment of extrapolation relations of displacement speed for detailed chemistry Direct Numerical Simulation database of statistically planar turbulent premixed flames2021
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Dr Markus Klein
Comparison of flame propagation statistics based on DNS of simple and detailed chemistry. Part 2: Influence of choice of reaction progress variable2021
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Dr Markus Klein
Comparison of flame propagation statistics extracted from DNS based on simple and detailed chemistry Part 1: Fundamental flame turbulence interaction2021
Hazem Awad
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Comparison of Surface Density Function (SDF) statistics between MILD and premixed turbulent combustion2021
Hazem Awad
Dr Khalil Abo Amsha
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Comparison of the reactive scalar gradient evolution between homogeneous MILD combustion and premixed turbulent flames2021
Arun Varma
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Effects of body forces on vorticity and enstrophy evolutions in turbulent premixed flames2021
Arun Varma
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Effects of buoyancy on turbulent kinetic energy transport in turbulent premixed flames2021
Ilias Konstantinou
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Effects of Fuel Lewis Number on the Near-wall Dynamics for Statistically Planar Turbulent Premixed Flames Impinging on Inert Cold Walls2021
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Dr Markus Klein
Effects of Turbulent Boundary Layer on the Near-Wall Flame Dynamics in the Case of Adiabatic Walls2021
Arun Varma
Dr Umair Ahmed
Dr Markus Klein
Professor Nilanjan Chakraborty
Effects of turbulent length scale on the bending effect of turbulent burning velocity in premixed turbulent combustion2021
Dr Sean Malkeson
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Evolution of Surface Density Function in an open turbulent jet spray flame2021
Professor Nilanjan Chakraborty
Dr Umair Ahmed
Dr Markus Klein
Evolutions of strain rate and dissipation rate of kinetic energy in turbulent premixed flames2021
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Flame self-interactions in an open turbulent jet spray flame2021
Gulcan Ozel Erol
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Flame self-interactions in globally stoichiometric spherically expanding flames propagating into fuel droplet-mists2021
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Dr Markus Klein
Influence of thermal wall boundary condition on scalar statistics during flame-wall interaction of premixed combustion in turbulent boundary layers2021
Dr Umair Ahmed
Alexander Herbert
Professor Nilanjan Chakraborty
Dr Markus Klein
On the validity of Damköhler’s second hypothesis in statistically planar turbulent premixed flames in the thin reaction zones regime2021
Dr Umair Ahmed
Dr Markus Klein
Professor Nilanjan Chakraborty
Principal strain rate evolution within turbulent premixed flames for different combustion regimes2021
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Dr Markus Klein
Scalar gradient and strain rate statistics in oblique premixed flame-wall interaction within turbulent channel flows2021
Dr Umair Ahmed
Turbulent length scales and budgets of Reynolds stress-transport for open-channel flows; Friction Reynolds numbers (Reτ ) = 150, 400 & 1020.2021
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Dr Markus Klein
Applicability of extrapolation relations for curvature and stretch rate dependences of displacement speed for statistically planar turbulent premixed flames2020
Dr Sean Malkeson
Dr Umair Ahmed
Dr Charles Turquand d'Auzay
Professor Nilanjan Chakraborty
Displacement speed statistics in an open turbulent jet spray flame2020
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Quantification of the flame structure at multi-scale levels2020
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Dr Markus Klein
Scaling of Second-Order Structure Functions in Turbulent Premixed Flames in the Flamelet Combustion Regime2020
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Surface density function evolution and the influence of strain rates during turbulent boundary layer flashback of hydrogen-rich premixed combustion2020
Peter Brearley
Dr Umair Ahmed
Professor Nilanjan Chakraborty
The relation between flame surface area and turbulent burning velocity in statistically planar turbulent stratified flames2020
Ilias Konstantinou
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Influence of fuel Lewis number on flame-wall interaction for impinging turbulent premixed flames2019
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Dr Markus Klein
Insights into the bending effect in premixed turbulent combustion using the Flame Surface Density transport2019
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Mean behaviour of flame displacement speed in boundary layer flashback of hydrogen-rich premixed turbulent combustion2019
Ilias Konstantinou
Dr Umair Ahmed
Dr Markus Klein
Professor Nilanjan Chakraborty
Near-wall behaviour of turbulence in flame-wall interaction of premixed turbulent combustion in boundary layers2019
Dr Umair Ahmed
Dr Markus Klein
Professor Nilanjan Chakraborty
Oblique flame-wall interaction in premixed turbulent combustion under isothermal and adiabatic wall boundary conditions2019
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Dr Markus Klein
On the stress-strain alignment in premixed turbulent flames2019
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Dr Markus Klein
Scalar gradient and strain rate statistics in oblique premixed flame-wall interaction with turbulent boundary layers2019
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Statistical behaviour of turbulent kinetic energy transport in boundary layer flashback of hydrogen-rich premixed combustion2019
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Statistical behaviour of turbulent kinetic energy transport in boundary layer flashback of hydrogen-rich premixed flames2019
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Statistical behaviours of conditioned two-point second-order structure functions in turbulent premixed flames in different combustion regimes2019
Dr Charles Turquand d'Auzay
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Statistics of progress variable and mixture fraction gradients in an open turbulent jet spray flame2019
Dr Umair Ahmed
Dr Charles Turquand d'Auzay
Professor Nilanjan Chakraborty
Statistics of reaction progress variable and mixture fraction gradients of a pulverised coal jet flame using Direct Numerical Simulation data2019
Ilias Konstantinou
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Dr Markus Klein
Statistics of turbulence during head-on quenching of premixed turbulent combustion in boundary layers2019
Dr Umair Ahmed
A Posteriori Assessment of Algebraic Scalar Dissipation Models for RANS Simulation of Premixed Turbulent Combustion2018
Dr Umair Ahmed
An energy transport based evolving rheology in high-shear rotor–stator mixers2018
Dr Umair Ahmed
Jiawei Lai
Professor Nilanjan Chakraborty
Effects of detailed chemistry on multiscale analysis of head-on quenching in premixed turbulent combustion2018
Dr Umair Ahmed
Large-eddy simulation of non-circular jet flow in a pilot-scale inline high-shear static mixer2018
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Multiscale analysis of head-on quenching premixed turbulent flames2018
Dr Umair Ahmed
Professor Nilanjan Chakraborty
Stress-strain alignment in premixed turbulent combustion2018
Dr Umair Ahmed
An energy transport based evolving rheology2017
Dr Umair Ahmed
Fluctuating loads on a tidal turbine due to velocity shear and turbulence: comparison of CFD with field data2017
Dr Umair Ahmed
The role of pressure Hessian in premixed turbulent combustion2017
Dr Umair Ahmed
Modelling flame turbulence interaction in RANS simulation of premixed turbulent combustion2016
Dr Umair Ahmed
CFD Simulations of a full-scale tidal turbine: Comparison of LES and RANS with field data2015
Dr Umair Ahmed
Large Eddy Simulations to represent a full-scale tidal stream flow and turbine2015
Dr Umair Ahmed
An evolution equation for flame turbulence interaction in premixed turbulent combustion2014
Dr Umair Ahmed
CFD Simulations of a Full-Scale Tidal Stream Turbine: Comparison Between Large-Eddy Simulations and Field Measurements2014
Dr Umair Ahmed
Towards the development of an evolution equation for flame turbulence interaction in premixed turbulent combustion2014