20162023
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Personal profile

Personal Statement

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. 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 Ph.D. from the University of Cambridge (2009) in Engineering. His Ph.D. thesis was in Aeroacoustics and focused on Jet Noise Modeling. Following this, he received a number of research fellowships that allowed him to work at the NASA Glenn Research Center with world-famous Scientists, Drs. Marvin Goldstein and S. J. Leib, on a variety of problems in Aeroacoustics, Turbulence modeling and Rapid-distortion theory. Between July 2013--April 2016 he was based at Imperial College London (Dept. of Mathematics) working under the Laminar Flow Control platform grant 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. His research interests include: Asymptotic analysis, Aeroacoustics, Turbulence theory & modeling, Boundary Layer Transition and Applied Mathematical methods.

Research Interests

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

Particular:

  • 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

General:

  • Perturbation methods in Applied Mathematics
  • Wiener-Hopf Technique
  • Complex analysis

 

Expertise & Capabilities

Main scientific results

  • We showed how optimally placed surface deformations hamper Gortler vortex growth rate and the temporal growth rates of resulting secondary instabilities (with A. Sescu, Mississippi State University).
  • We showed how non-parallel flow effects re-distribute the “two-peak” asymptotic structure of the Green’s function in the acoustic analogy approach so that a heated supersonic flow is quieter than an isothermal flow (with A. Sescu, Mississippi State University).
  • Showed how negative correlation in upstream turbulence affects the low frequency roll-off of the jet-surface interaction noise spectrum.
  • Working with NASA colleagues, we extending the Rapid-distortion theory of turbulence to compressible transversely sheared mean flows with physically realizable upstream boundary conditions (with M. E. Goldstein & S. J. Leib, NASA Glenn Research Center). This theory was applied to trailing edge noise problem.
  • We showed that non-parallel flow introduces a “two-peak” spatial structure in the Green’s function for predicting the low frequency jet noise in isothermal air jets under an appropriate asymptotic distinguished limit (with M. E. Goldstein, NASA Glenn Research Center & A. Sescu, University of Toledo).
  • Generalized spherical shell turbulence models to cylindrical shells in the axi-symmetric kinematic representation of the Reynolds stress auto-covariance tensor. This was validated against LES of high subsonic isothermal jet & PIV of incompressible water jet.

Teaching Interests

ME201 Aero Design  (Flight Mechanics)

ME405 Heat & Flow 4  (Heat transfer)

Academic / Professional qualifications

Education:

  • (Jan) 2004 – (Sept.) 2008:  Ph.D. in Aeronautical Engineering at Cambridge University, Department of Engineering. 

  • (Sept.) 1999 – 2003: First Class honors in Aeronautical Engineering M.Eng. at Bristol University, Department of Aeronautical Engineering.

Reviewer for:

  • Physics of Fluids
  • AIAA Journal
  • Journal of Fluid Mechanics

Member:

  • American Physical Society

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Projects 2017 2023

Doctoral Training Partnership 2018-19 University of Strathclyde | Stirrat, Sarah

Afsar, M., Cartmell, M. & Stirrat, S.

EPSRC (Engineering and Physical Sciences Research Council)

1/10/191/04/23

Project: Research Studentship - Internally AllocatedResearch Studentship (Internally Allocated)

Jet noise modeling in heated and isothermal supersonic air jets

Afsar, M., Sescu, A. & Sassanis, V.

1/01/1831/05/18

Project: Non-funded project

Research Output 2016 2019

Advances in aeroacoustics research: recent developments and perspectives

Karabasov, S., Ayton, L., Wu, X. & Afsar, M., 25 Aug 2019, (Accepted/In press) In : Philosophical Transactions A: Mathematical, Physical and Engineering Sciences. 4 p.

Research output: Contribution to journalArticle

Aeroacoustics
aeroacoustics
Aviation
research and development
Research and Development

Effect of non-parallel mean flow on the acoustic spectrum of heated supersonic jets: explanation of 'jet quietening'

Afsar, M. Z., Sescu, A. & Sassanis, V., 21 Sep 2019, (Accepted/In press) In : Physics of Fluids B. 55 p.

Research output: Contribution to journalArticle

Open Access
File
Acoustics
acoustics
Fluxes
jet aircraft noise
noise prediction

Prizes

Global Engagements Fund (GEF) 2018

Mohammed Afsar (Recipient), 5 Jul 2018

Prize: Fellowship awarded competitively

Activities 2016 2019

  • 2 Invited talk
  • 1 Journal peer review

Philosophical Transactions A: Mathematical, Physical and Engineering Sciences (Journal)

Sergey Karabasov (Guest editor), Lorna Ayton (Peer reviewer), Xuesong Wu (Peer reviewer), Mohammed Afsar (Peer reviewer)
1 Nov 2019

Activity: Publication peer-review and editorial work typesJournal peer review

Validity of a non-parallel flow asymptotic theory for the adjoint vector Green's function within the generalized acoustic analogy

Mohammed Afsar (Speaker)
1 May 2019

Activity: Talk or presentation typesInvited talk