Publications by Dr Umair Ahmed - ePrints

Browsing publications by Dr Umair Ahmed.

Newcastle Authors	Title	Year
Freddie Young Dr Umair Ahmed Professor Nilanjan Chakraborty	Influence of preferential diffusion on the distribution of species in lean H₂-air laminar premixed flames at different equivalence ratios	2025
Dr Liyuan Liu Dr Umair Ahmed Professor Nilanjan Chakraborty	A Comprehensive Evaluation of Turbulence Models for Predicting Heat Transfer in Turbulent Channel Flow Across Various Prandtl Number Regimes	2024
Dr Hazem Awad Dr Khalil Abo Amsha Dr Umair Ahmed Professor Nilanjan Chakraborty	An Assessment of the Validity of Damköhler’s Hypotheses for Different Choices of Reaction Progress Variable in Homogenous Mixture Moderate or Intense Low-Oxygen Dilution (MILD) Combustion	2024
Dr Umair Ahmed Dr Sanjeev Ghai Professor Nilanjan Chakraborty	Assessment of Laws of the Wall During Flame–Wall Interaction of Premixed Flames Within Turbulent Boundary Layers	2024
Dr Umair Ahmed Dr Sanjeev Ghai Professor Nilanjan Chakraborty	Direct Numerical Simulation Analysis of the Closure of Turbulent Scalar Flux during Flame–Wall Interaction of Premixed Flames within Turbulent Boundary Layers	2024
Dr Umair Ahmed Professor Nilanjan Chakraborty Dr Markus Klein	Effects of laminar burning velocity to friction velocity ratio on turbulent premixed flame-wall interaction within turbulent boundary layers	2024
Dr Sanjeev Ghai Dr Umair Ahmed Professor Nilanjan Chakraborty	Effects of wall temperature on scalar and turbulence statistics during premixed flame-wall interaction within turbulent boundary layers	2024
Gulcan Ozel Erol Dr Umair Ahmed Professor Nilanjan Chakraborty	Evolution of Displacement Speed Statistics during Head-On Flame-Wall Interaction within Turbulent Boundary Layers	2024
Professor Nilanjan Chakraborty Harry Dunn Dr Umair Ahmed	Evolution of Flame Displacement Speed Within Flame Front in Different Regimes of Premixed Turbulent Combustion	2024
Peter Brearley Dr Umair Ahmed Professor Nilanjan Chakraborty	Implications of using scalar forcing to sustain reactant mixture stratification in Direct Numerical Simulations of turbulent combustion	2024
Dr Sanjeev Ghai Dr Umair Ahmed Professor Nilanjan Chakraborty	Modelling of the flame surface density transport during flame-wall interaction of premixed flames within turbulent boundary layers	2024
Dr Khalil Abo-Amsha Dr Hazem Awad Dr Umair Ahmed Professor Nilanjan Chakraborty	On the Definition of Reaction Progress Variable in Exhaust Gas Recirculation Type Turbulent MILD Combustion of Methane and n-Heptane	2024
Vishnu Mohan Dr Umair Ahmed Professor Nilanjan Chakraborty	Proper Orthogonal Decomposition of wall shear stress during head-on flame-wall interaction	2024
Dr Umair Ahmed Dr Sanjeev Ghai Professor Nilanjan Chakraborty	Relations between Reynolds stresses and their dissipation rates during premixed flame-wall interaction within turbulent boundary layers	2024
Dr Sanjeev Ghai Dr Umair Ahmed Professor Nilanjan Chakraborty	Statistical Behaviour and Modelling of Variances of Reaction Progress Variable and Temperature During Flame-Wall Interaction of Premixed Flames Within Turbulent Boundary Layers	2024
Dr Hazem Awad Dr Khalil Abo-Amsha Dr Umair Ahmed Professor Nilanjan Chakraborty	A Direct Numerical Simulation based comparison between conventional and MILD combustion processes of turbulent stratified mixtures	2023
Dr Hazem Awad Dr Khalil Abo-Amsha Dr Umair Ahmed Professor Nilanjan Chakraborty	A Direct Numerical Simulation based comparison between Homogenous and Inhomogeneous mixture MILD Combustion Modelling in the context of Reynolds Averaged Navier-Stokes Simulations	2023
Dr Hazem Awad Dr Khalil Abo-Amsha Dr Umair Ahmed Professor Nilanjan Chakraborty	A Priori Direct Numerical Simulation assessment of MILD combustion modelling in the context of Large Eddy Simulation	2023
Dr Hazem Awad Dr Khalil Abo Amsha Dr Umair Ahmed Professor Nilanjan Chakraborty	A Priori Direct Numerical Simulation Assessment of MILD Combustion Modelling in the Context of Reynolds Averaged Navier–Stokes Simulations	2023
Arun Varma Dr Umair Ahmed Professor Nilanjan Chakraborty	Effects of body force on the statistical behaviour and modelling of scalar variance in turbulent premixed flames	2023
Professor Nilanjan Chakraborty Dr Sanjeev Ghai Dr Umair Ahmed	Effects of fuel Lewis number on turbulent flow statistics in oblique-wall quenching of premixed V-shaped flames within turbulent channel flows	2023
Dr Sanjeev Ghai Dr Umair Ahmed Professor Nilanjan Chakraborty	Effects of Fuel Lewis Number on Wall Heat Transfer During Oblique Flame-Wall Interaction of Premixed Flames Within Turbulent Boundary Layers	2023
Peter Brearley Dr Umair Ahmed Professor Nilanjan Chakraborty	Effects of Mixture Distribution on the Structure and Propagation of Turbulent Stratified Slot-Jet Flames	2023
Gulcan Ozel Erol Dr Umair Ahmed Professor Nilanjan Chakraborty	Evolution of displacement speed statistics during flame-wall interaction within turbulent boundary layers	2023
Professor Nilanjan Chakraborty Dr Umair Ahmed	Evolution of flame displacement speed within flame front in different regimes of turbulent premixed combustion	2023
Dr Umair Ahmed Dr Sean Malkeson Professor Nilanjan Chakraborty	Flame self interaction during turbulent boundary layer flashback of hydrogen-rich premixed combustion	2023
Dr Hazem Awad Dr Umair Ahmed Professor Nilanjan Chakraborty	Flame self-interactions in MILD combustion of homogeneous and inhomogeneous mixtures	2023
Dr Khalil Abo-Amsha Dr Umair Ahmed Professor Nilanjan Chakraborty	Flow topologies during Flame-Wall Interaction of premixed combustion in turbulent boundary layer	2023
Dr Umair Ahmed Professor Nilanjan Chakraborty Dr Markus Klein	Influence of flow configuration and thermal wall boundary conditions on turbulence during premixed flame-wall interaction within low Reynolds number boundary layers	2023
Dr Umair Ahmed Professor Nilanjan Chakraborty Dr Markus Klein	Influence of the variation in laminar burning velocity to friction velocity ratio on turbulent premixed flame-wall interaction within turbulent boundary layers	2023
Vishnu Mohan Dr Umair Ahmed Professor Nilanjan Chakraborty	Proper orthogonal decomposition of wall heat flux for head-on premixed flame wall-interaction across turbulent boundary layers	2023
Dr Umair Ahmed Dr Sanjeev Ghai Dr Liyuan Liu Professor Nilanjan Chakraborty	Statistical behaviour and closure of turbulent scalar flux during turbulent premixed flame-wall interaction within turbulent boundary layers	2023
Dr Sanjeev Ghai Dr Umair Ahmed Professor Nilanjan Chakraborty	Statistical behaviour of scalar variance transport during flame-wall interaction in turbulent boundary layers	2023
Arun Varma Dr Umair Ahmed Professor Nilanjan Chakraborty	Turbulence effects on the statistical behaviour and modelling of flame surface density and the terms of its transport equation in turbulent premixed flames	2023
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 conditions	2023
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 Simulations	2022
Freddie Young Dr Hazem Awad Dr Khalil Abo Amsha Dr Umair Ahmed Professor Nilanjan Chakraborty et al.	A comparison between statistical behaviours of scalar dissipation rate between homogeneous MILD combustion and premixed turbulent flames	2022
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 flames	2022
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 flames	2022
Dr Umair Ahmed Dr Jian Fang Professor Nilanjan Chakraborty	An unstructured Adaptive Mesh Refinement approach for Computational Fluid Dynamics of reacting flows	2022
Dr Umair Ahmed Professor Nilanjan Chakraborty	Analysis of the evolution of the Surface Density Function during premixed V-shaped flame-wall interaction in a turbulent channel flow at Re_τ= 395	2022
Dr 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 flames	2022
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 Flames	2022
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 flames	2022
Arun Varma Dr Umair Ahmed Professor Nilanjan Chakraborty	Effects of Body Forces on Turbulent Kinetic Energy Transport in Premixed Flames	2022
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 simulations	2022
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 evaluations	2022
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 layers	2022
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 layers	2022
Dr Umair Ahmed Professor Nilanjan Chakraborty Dr Markus Klein	Influence of flow configuration and thermal wall boundary conditions on turbulence during premixed flame-wall interaction within boundary layers.	2022
Dr Sanjeev Ghai Dr Umair Ahmed Professor Nilanjan Chakraborty	Performance of wall functions in premixed flame-wall interaction within turbulent boundary layers	2022
Professor Nilanjan Chakraborty Dr Umair Ahmed Dr Sanjeev Ghai	Premixed Flame-Wall Interaction and Heat Transfer Characteristics in Turbulent Boundary Layers: Insights based on Direct Numerical Simulations	2022
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 flames	2022
Peter Brearley Dr Umair Ahmed Professor Nilanjan Chakraborty	Scalar Forcing Methodology for Direct Numerical Simulations of Turbulent Stratified Mixture Combustion	2022
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 configurations	2022
Peter Brearley Dr Umair Ahmed Professor Nilanjan Chakraborty	Turbulent stratified mixture combustion with numerically forced bimodal mixture inhomogeneity	2022
Dr Umair Ahmed Dr Jian Fang Professor Nilanjan Chakraborty	Validation of the HAMISH code: DNS of combustion with Adaptive Mesh Refinement	2022
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 Simulations	2021
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 flames	2021
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 configuration	2021
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 variable	2021
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 interaction	2021
Dr Hazem Awad Dr Umair Ahmed Professor Nilanjan Chakraborty	Comparison of Surface Density Function (SDF) statistics between MILD and premixed turbulent combustion	2021
Dr 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 flames	2021
Arun Varma Dr Umair Ahmed Professor Nilanjan Chakraborty	Effects of body forces on vorticity and enstrophy evolutions in turbulent premixed flames	2021
Arun Varma Dr Umair Ahmed Professor Nilanjan Chakraborty	Effects of buoyancy on turbulent kinetic energy transport in turbulent premixed flames	2021
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 Walls	2021
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 Walls	2021
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 combustion	2021
Dr Sean Malkeson Dr Umair Ahmed Professor Nilanjan Chakraborty	Evolution of Surface Density Function in an open turbulent jet spray flame	2021
Professor Nilanjan Chakraborty Dr Umair Ahmed Dr Markus Klein	Evolutions of strain rate and dissipation rate of kinetic energy in turbulent premixed flames	2021
Dr Umair Ahmed Professor Nilanjan Chakraborty	Flame self-interactions in an open turbulent jet spray flame	2021
Gulcan Ozel Erol Dr Umair Ahmed Professor Nilanjan Chakraborty	Flame self-interactions in globally stoichiometric spherically expanding flames propagating into fuel droplet-mists	2021
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 layers	2021
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 regime	2021
Dr Umair Ahmed Dr Markus Klein Professor Nilanjan Chakraborty	Principal strain rate evolution within turbulent premixed flames for different combustion regimes	2021
Dr Umair Ahmed Professor Nilanjan Chakraborty Dr Markus Klein	Scalar gradient and strain rate statistics in oblique premixed flame-wall interaction within turbulent channel flows	2021
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 flames	2020
Dr Sean Malkeson Dr Umair Ahmed Dr Charles Turquand d'Auzay Professor Nilanjan Chakraborty	Displacement speed statistics in an open turbulent jet spray flame	2020
Dr Umair Ahmed Professor Nilanjan Chakraborty	Quantification of the flame structure at multi-scale levels	2020
Dr Umair Ahmed Professor Nilanjan Chakraborty Dr Markus Klein	Scaling of Second-Order Structure Functions in Turbulent Premixed Flames in the Flamelet Combustion Regime	2020
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 combustion	2020
Peter Brearley Dr Umair Ahmed Professor Nilanjan Chakraborty	The relation between flame surface area and turbulent burning velocity in statistically planar turbulent stratified flames	2020
Ilias Konstantinou Dr Umair Ahmed Professor Nilanjan Chakraborty	Influence of fuel Lewis number on flame-wall interaction for impinging turbulent premixed flames	2019
Dr Umair Ahmed Professor Nilanjan Chakraborty Dr Markus Klein	Insights into the bending effect in premixed turbulent combustion using the Flame Surface Density transport	2019
Dr Umair Ahmed Professor Nilanjan Chakraborty	Mean behaviour of flame displacement speed in boundary layer flashback of hydrogen-rich premixed turbulent combustion	2019
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 layers	2019
Dr Umair Ahmed Dr Markus Klein Professor Nilanjan Chakraborty	Oblique flame-wall interaction in premixed turbulent combustion under isothermal and adiabatic wall boundary conditions	2019
Dr Umair Ahmed Professor Nilanjan Chakraborty Dr Markus Klein	On the stress-strain alignment in premixed turbulent flames	2019
Dr Umair Ahmed Professor Nilanjan Chakraborty Dr Markus Klein	Scalar gradient and strain rate statistics in oblique premixed flame-wall interaction with turbulent boundary layers	2019
Dr Umair Ahmed Professor Nilanjan Chakraborty	Statistical behaviour of turbulent kinetic energy transport in boundary layer flashback of hydrogen-rich premixed combustion	2019
Dr Umair Ahmed Professor Nilanjan Chakraborty	Statistical behaviour of turbulent kinetic energy transport in boundary layer flashback of hydrogen-rich premixed flames	2019
Dr Umair Ahmed Professor Nilanjan Chakraborty	Statistical behaviours of conditioned two-point second-order structure functions in turbulent premixed flames in different combustion regimes	2019
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 flame	2019
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 data	2019
Ilias Konstantinou Dr Umair Ahmed Professor Nilanjan Chakraborty Dr Markus Klein	Statistics of turbulence during head-on quenching of premixed turbulent combustion in boundary layers	2019
Dr Umair Ahmed	A Posteriori Assessment of Algebraic Scalar Dissipation Models for RANS Simulation of Premixed Turbulent Combustion	2018
Dr Umair Ahmed	An energy transport based evolving rheology in high-shear rotor–stator mixers	2018
Dr Umair Ahmed Jiawei Lai Professor Nilanjan Chakraborty	Effects of detailed chemistry on multiscale analysis of head-on quenching in premixed turbulent combustion	2018
Dr Umair Ahmed	Large-eddy simulation of non-circular jet flow in a pilot-scale inline high-shear static mixer	2018
Dr Umair Ahmed Professor Nilanjan Chakraborty	Multiscale analysis of head-on quenching premixed turbulent flames	2018
Dr Umair Ahmed Professor Nilanjan Chakraborty	Stress-strain alignment in premixed turbulent combustion	2018
Dr Umair Ahmed	An energy transport based evolving rheology	2017
Dr Umair Ahmed	Fluctuating loads on a tidal turbine due to velocity shear and turbulence: comparison of CFD with field data	2017
Dr Umair Ahmed	The role of pressure Hessian in premixed turbulent combustion	2017
Dr Umair Ahmed	Modelling flame turbulence interaction in RANS simulation of premixed turbulent combustion	2016
Dr Umair Ahmed	CFD Simulations of a full-scale tidal turbine: Comparison of LES and RANS with field data	2015
Dr Umair Ahmed	Large Eddy Simulations to represent a full-scale tidal stream flow and turbine	2015
Dr Umair Ahmed	An evolution equation for flame turbulence interaction in premixed turbulent combustion	2014
Dr Umair Ahmed	CFD Simulations of a Full-Scale Tidal Stream Turbine: Comparison Between Large-Eddy Simulations and Field Measurements	2014
Dr Umair Ahmed	Towards the development of an evolution equation for flame turbulence interaction in premixed turbulent combustion	2014