M.Z. Afsar holds a Masters in Aeronautical Engineering (2003) from the University of Bristol for which he received several commendations including the Royal Aeronautical Society Award and Rolls Royce prize. His research career began in the summer of 2002 when, still as an undergraduate, he obtained a Research Assistantship at the Department of Applied Physics of Yale University. Here he worked as an experimentalist, conducting Particle Image Velocimetry measurements in laminar flames using laser diagnostic tools. He holds a PhD from the University of Cambridge (2009) in Engineering. His PhD thesis was in Aeroacoustics and focused on Applied Mathematical aspects of jet noise theory and modelling. Following this, he received a number of research fellowships (culminating with the NASA Post-doctoral program) that allowed him to work at the NASA Glenn Research Center with world-famous Applied Mathematicians, Drs. Marvin Goldstein and S. J. Leib, on a variety of problems in Aeroacoustics, Turbulence modelling and Rapid-distortion theory. Between July 2013--April 2016 he was based at Imperial College London (Dept. of Mathematics) working under the Chapman Fellowship and Laminar Flow Control platform grant mainly with Professor X. Wu. Before joining Strathclyde University he was a visiting academic at Queen Mary University (in June-July 2016) and a remote visitor for the Stanford University Center for Turbulence Research summer program. He is a regular visitor to the Department of Mathematics at Kashmir University in Srinagar (India) and his research interests include Asymptotic analysis, Aeroacoustics, Turbulence theory & modelling, Boundary-Layer Transition and Applied Mathematical methods.
ME101 - Heat & Flow 1 (Basic Fluid Mechanics)
ME201 - Aero Design (Flight Mechanics)
ME405 - Heat & Flow 4 (Heat transfer)
ME530 - Aero-acoustics (Mainly on Applied Mathematics)
Current research involves mathematical & numerical analysis of jet flow turbulence for Aero-acoustics problems such as jet noise and trailing/leading edge noise. I am also interested in mathematical modeling of boundary layer transition (receptivity and secondary instability theory) and wall turbulence.
Fields of scientific interest
- Secondary instabilities of streamwise vortex flows
- Trailing/leading edge noise
- Rapid-distortion theory of turbulence
- Jet noise modeling in heated/isothermal flows
- Kinematic and dynamic modeling of jet turbulence
- Perturbation methods in Applied Mathematics
- Wiener-Hopf Technique
- Complex analysis
- An overview of the Rapid-distortion theory approach to jet surface interaction noise modelling
- Sixteenth International Conference on Flow Dynamics, November 6 - 8, 2019, Sendai, Miyagi, Japan
- Philosophical Transactions A: Mathematical, Physical and Engineering Sciences (Journal)
- Peer reviewer
- Validity of a non-parallel flow asymptotic theory for the adjoint vector Green's function within the generalized acoustic analogy
- A formal asymptotic approach to modeling low frequency jet noise in heated and unheated air jets
More professional activities
- Doctoral Training Partnership 2018-19 University of Strathclyde | Stirrat, Sarah
- Afsar, Mohammed (Principal Investigator) Cartmell, Matthew (Co-investigator) Stirrat, Sarah (Research Co-investigator)
- 01-Jan-2019 - 01-Jan-2023
- Jet noise modeling in heated and isothermal supersonic air jets
- Afsar, Mohammed (Principal Investigator) Sescu, Adrian (Principal Investigator) Sassanis, Vasilis (Principal Investigator)
- We use asymptotic methods to approximate the adjoint vector Green's function for the linearized Euler equations when the mean flow is non-parallel (and specifically is slowly diverging, with an asymptotically small spread rate). The Green's function solution is used in the generalized acoustic analogy to predict far field sound together with an algebraic-exponential turbulence model.
- 01-Jan-2018 - 31-Jan-2018
- Comparison of trailing edge noise model with Large-Eddy Simulations
- Afsar, Mohammed (Principal Investigator) Sescu, Adrian (Co-investigator)
- We use rapid-distortion theory on transversely sheared mean flows to analyse the sound radiation produced by the interaction of a two-dimensional jet with the downstream edge of a flat plate. The results are compared with Large Eddy simulations to show the consistency of the upstream boundary condition for the convected quantity in the basic theory.
- 01-Jan-2017 - 01-Jan-2018
- Optimal control of Gortler vortices using surface deformations
- Sescu, Adrian (Principal Investigator) Afsar, Mohammed (Co-investigator)
The control of stream-wise vortices in high Reynolds number boundary layer flows often aims at reducing the vortex energy as a means of mitigating the growth of secondary instabilities, which eventually delay the transition from laminar to turbulent flow. In this paper, we aim at utilizing such an energy reduction strategy using optimal control theory to limit the growth of G ̈ortler vortices developing in an incompressible laminar boundary layer flow over a concave wall, and excited by a row of roughness elements with span-wise separation in the same order of magnitude as the boundary layer thickness. Commensurate with control theory formalism, we transform a constrained optimization problem into an unconstrained one by applying the method of Lagrange multipliers. A high Reynolds number asymptotic framework is utilized, wherein the Navier-Stokes equations are reduced to the boundary region equations (BRE), in which wall deformations enter the problem through an appropriate Prandtl transformation. In the optimal control strategy, the wall displacement or the wall transpiration velocity serve as control variables, while the cost functional is defined in terms of the wall shear stress.
- 01-Jan-2017 - 01-Jan-2018
Mechanical and Aerospace Engineering
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