• United Kingdom

Accepting PhD Students

PhD projects

1. Jet noise modeling in non axi-symmetric air jets. 2. Large scale turbulence structures in compressible pipe flow. 3. Optimal control of vortices on aircraft wings using local surface deformations.

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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 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.

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

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)

 

Academic / Professional qualifications

Education:

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

  • (Sept.) 1999 – 2003: First Class honours 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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