Dr Umair Ahmed

Research Associate

Email: umair.ahmed@ncl.ac.uk

Research

Computational Fluid Dynamics (CFD)
Direct Numerical Simulation (DNS) of turbulence and combustion
Modelling and Simulation of turbulence and combustion under Large Eddy Simulation (LES) and Reynolds Averaged Navier Stokes (RANS) frameworks
Heat Transfer modelling
Numerical modelling of Non-Newtonian fluid flows

Publications

Ahmed U, Chakraborty N, Klein M. On the stress-strain alignment in premixed turbulent flames. Scientific Reports 2019, 9, 5092.
Konstantinou I, Ahmed U, Klein M, Chakraborty N. Near-wall behaviour of turbulence in flame-wall interaction of premixed turbulent combustion in boundary layers. In: 9th European Combustion Meeting (ECM 2019). 2019, Lisboa, Portugal.
Turquand d'Auzay C, Ahmed U, Pillai A, Chakraborty N, Kurose R. Statistics of progress variable and mixture fraction gradients in an open turbulent jet spray flame. Fuel 2019, 247, 198-208.
Ahmed U, Chakraborty N, Klein M. Insights into the bending effect in premixed turbulent combustion using the Flame Surface Density transport. Combustion Science and Technology 2019, Epub ahead of print.
Ahmed U, Turquand d'Auzay C, Muto M, Chakraborty N, Kurose R. Statistics of reaction progress variable and mixture fraction gradients of a pulverised coal jet flame using Direct Numerical Simulation data. Proceedings of the Combustion Institute 2018, 37(3), 2821-2830.
Ahmed U, Doan NAK, Lai J, Klein M, Chakraborty N, Swaminathan N. Multiscale analysis of head-on quenching premixed turbulent flames. Physics of Fluids 2018, 30(10), 105102.
Ahmed U, Chakraborty N, Klein M. Stress-strain alignment in premixed turbulent combustion. In: 12th International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurement (ETMM12). 2018, Montpelier, France.
Ahmed U, Lai J, Doan NAK, Klein M, Chakraborty N, Swaminathan N. Effects of detailed chemistry on multiscale analysis of head-on quenching in premixed turbulent combustion. In: 12th International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurement (ETMM12). 2018, Montpelier, France.
Michael V, Bagkeris I, Ahmed U, Prosser R, Kowalski A. Large-eddy simulation of non-circular jet flow in a pilot-scale inline high-shear static mixer. In: 12th International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurement (ETMM12). 2018, Montpelier, France.
Ahmed U, Michael V, Hou R, Mothersdale T, Prosser R, Kowalski A, Martin P. An energy transport based evolving rheology in high-shear rotor–stator mixers. Chemical Engineering Research and Design 2018, 133, 398-406.
Ahmed U, Prosser R. A Posteriori Assessment of Algebraic Scalar Dissipation Models for RANS Simulation of Premixed Turbulent Combustion. Flow, Turbulence and Combustion 2018, 100(1), 39-73.
Ahmed U, Prosser R, Kowalski A. An energy transport based evolving rheology. In: 9th International Symposium on Mixing in Industrial Processes. 2017, Birmingham, UK.
Ahmed U, Apsley D, Afgan I, Stallard T, Stansby P. Fluctuating loads on a tidal turbine due to velocity shear and turbulence: comparison of CFD with field data. Renewable Energy 2017, 112, 235-246.
Ahmed U, Nivarti G, Zimon M, Prosser R, Cant R. The role of pressure Hessian in premixed turbulent combustion. In: Sixteenth SIAM International Conference on Numerical Combustion. 2017, Orlando, FL, USA: SIAM.
Ahmed U, Prosser R. Modelling flame turbulence interaction in RANS simulation of premixed turbulent combustion. Combustion Theory and Modelling 2016, 20(1), 34-57.
Ahmed U, Afgan I, Apsley D, Stallard T, Stansby P. CFD Simulations of a full-scale tidal turbine: Comparison of LES and RANS with field data. In: 11th European Wave and Tidal Energy Conference. 2015, Nantes, France.
Ahmed U, Afgan I, Apsley D, Stallard T, Stansby P. Large Eddy Simulations to represent a full-scale tidal stream flow and turbine. In: Oxford Tidal Energy Workshop. 2015, Oxford, UK.
Ahmed U, Prosser R, Revell A. Towards the development of an evolution equation for flame turbulence interaction in premixed turbulent combustion. Flow, Turbulence and Combustion 2014, 93(4), 637-663.
Ahmed U, Prosser R, Revell A. An evolution equation for flame turbulence interaction in premixed turbulent combustion. ERCOFTAC Bulletin 2014, 96.
Ahmed U, Prosser R, Revell A. A transport equation for flame turbulence interaction in premixed turbulent combustion. In: European Combustion Meeting. 2013, Lund, Sweden.