People

Dr Zahir Hussain

Lecturer in Fluid Dynamics

School/Department: Engineering, School of

Email: zahir.hussain@leicester.ac.uk

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Hussain Research Group

Profile

I am a Lecturer in Fluid Dynamics at University of Leicester. As an applied mathematician my research interests lie in the development of mathematical models and numerical methods to describe rotating boundary-layer fluid flows. I am an active researcher in the field of hydrodynamic stability theory in which I have numerous journal and conference publications most notably multiple recent outputs of international quality and standard. As an expert on the application of asymptotics and numerics to boundary-layer flows I have developed a theoretical formulation to model the stability of air flow over sharp spinning bodies. Meanwhile I maintain excellent links with researchers at Cambridge Warwick and Sydney Australia and am National Lead of the UK Fluids Network (UKFN) Special Interest Group (SIG) on ‘Boundary Layers & Complex Rotating Flows’. I hold Visiting Research Fellow positions at Sydney and KTH Royal Institute of Technology Sweden. As an expert in hydrodynamic stability theory I welcome interest from skilled fluid mechanics researchers and potential PhD students to join my research team within ACE.

Research

Research expertise

Fluid dynamics, hydrodynamic stability theory, boundary-layer transition over rotating bodies, aerodynamics, asymptotics, Chemical Vapour Deposition (CVD), non-Newtonian fluid flows, absolute and convective instabilities, non-modal stability theory, CFD of aerodynamically significant flows, multiphase flows, Large Eddy Simulation (LES), spectral stability analysis.

Grants

  • 2020 EPSRC COVID-19 Allocation Fund, University of Leicester - £37k
  • 2018 EPSRC New Investigator Award - £190k

Prizes & awards

  • 2020 College Award for a funded PhD Studentship on the Fluid Dynamics of Swirling Flow in a Duct - £60k
  • 2018 Faculty Award for a funded PhD Studentship on the Fluid Dynamics of Rotating Boundary Layers - £60k
  • 2015 Faculty Award for fully funded PhD Studentship in Fluid Mechanics, £60k
  • 2012 Innovation Fellowship: 'Capturing the commercial value in theoretical and computational studies of model fluid flows with engineering significance', £20k

Publications

(0)

Journal articles

J. Unadkat, M. Fildes, S. Tambe, K. Kato, Z. Hussain (2022) Experimental and theoretical comparisons of the boundary-layer flow over rotating cones in axial flow. Part II: The centrifugal instability. (to be submitted to Journal of Fluid Mechanics).

B. Alveroglu, A. Segalini, R. J. Lingwood, Z. Hussain (2022) BEK system flows over a rough rotating disk with partial-slip boundary conditions on the perturbations (to be submitted to Physics of Fluids).

B. Smith, Z. Hussain, S. J. Garrett, S. A. W. Calabretto, A. Segalini (2022) The steady flow around a rotating sphere at large Reynold's numbers with temperature dependent viscosity. (to be submitted to Journal of Fluid Mechanics).

J. Unadkat, S. Tambe, M. Fildes, Z. Hussain (2022) Experimental and theoretical comparisons of the boundary-layer flow over rotating cones in axial flow. Part I: The crossflow instability. (to be submitted to Journal of Fluid Mechanics).

M. A. S. Al-Malki, M. Fildes, Z. Hussain (2022) Competing roughness effects on the non-stationary crossflow instability of the boundary-layer over a rotating cone. (to be submitted to Journal of Fluid Mechanics).

B. F. H. Al Saeedi, Z. Hussain (2021) Inviscid modes within the boundary-layer flow of a rotating disk with wall suction and in an external free-stream. Mathematics - Asymptotics for Differential Equations. 9(22), 2967.

M. A. S. Al-Malki, Z. Hussain, S. J. Garrett, S. A. W. Calabretto (2021) The effects of parietal suction and injection on the stability of the Blasius boundary-layer flow over a permeable, heated plate. Physical Review Fluids. 6(11), 113902.

M. A. S. Al-Malki, S. J. Garrett, S. Camarri, Z. Hussain (2021) The effects of roughness levels on the instability of the boundary-layer flow over a rotating disk with an enforced axial flow. Physics of Fluids. 33(10), 104109.

R. Bhoraniya, Z. Hussain, V. Narayanan (2021). Global stability analysis of the axisymmetric boundary layer on a slender circular cone with the streamwise adverse pressure gradient. European Journal of Mechanics - B/Fluids. 87, pp.113-127.

M. Fildes, Z. Hussain, J. Unadkat, S. J. Garrett (2020) Analysis of boundary layer flow over a broad rotating cone in still fluid with non-stationary modes. Physics of Fluids. 32(12), 124118.

R. Miller, PT. Griffiths, Z. Hussain, S. J. Garrett (2020). On the stability of a heated rotating-disk boundary layer in a temperature-dependent viscosity fluid. Physics of Fluids. 32(2), 024105.

R. Miller, S. J. Garrett, P. T. Griffiths, Z. Hussain (2018). Stability of the Blasius boundary layer over a heated plate in a temperature-dependent viscosity flow. Physical Review Fluids. 3(11)(113902), pp.1-36.

P. T. Griffiths, S. J. Garrett, S. O. Stephen, Z. Hussain (2017). Quantifying non-Newtonian effects in rotating boundary-layer flows. European Journal of Mechanics - B/Fluids. 61(2), pp.304-309.

Z. Hussain (2017). Competing instabilities of rotating boundary-layer flows in an axial free-stream. European Journal of Mechanics - B/Fluids. 61, pp.316-320.

P. D. Towers, Z. Hussain, P. T. Griffiths, S. J. Garrett (2016). Viscous modes within the compressible boundary-layer flow due to a broad rotating cone. IMA Journal of Applied Mathematics. 81(5), pp.940-960.

Z. Hussain, S. J. Garrett, S. O. Stephen, P. T. Griffiths (2016). The centrifugal instability of the boundary-layer flow over a slender rotating cone in an enforced axial free stream. Journal of Fluid Mechanics. 788, pp.70-94.

Z. Hussain, S. J. Garrett, S. O. Stephen (2014). The centrifugal instability of the boundary-layer flow over slender rotating cones. Journal of Fluid Mechanics. 755, pp.274-293.

Z. Hussain, S. J. Garrett, S. O. Stephen (2012). The centrifugal instability of a slender rotating cone. Journal of Algorithms and Computational Technology. 6(1), pp.113-128.

Z. Hussain, S. J. Garrett, S. O. Stephen (2011). The instability of the boundary layer over a disk rotating in an enforced axial flow. Physics of Fluids. 23(11)(114108), pp.1-13.

S. J. Garrett, Z. Hussain, S. O. Stephen (2010). Boundary-Layer Transition on Broad Cones rotating in an Imposed Axial Flow. AIAA Journal. 48(6), pp.1184-1194.

S. J. Garrett, Z. Hussain, S. O. Stephen (2009). The cross-flow instability of the boundary layer on a rotating cone. Journal of Fluid Mechanics. 622, pp.209-232.

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Supervision

Post-Doctoral Research Associates (PDRAs)

  • Dr Jay Unadkat (University of Leicester), Post-doctoral supervisor, 2018-2021

 

Postgraduate supervision (completed/in progress)

Current research students

  • Sara Ahmed Almammary, PhD secondary supervisor, 2021-
  • Maha Alshahrani, PhD secondary supervisor, 2021-
  • Matthew Fildes, PhD primary supervisor, 2018-
  • Bashar Al Saeedi, PhD primary supervisor, 2019-
  • Ben Smith, PhD primary supervisor, 2019-
  • Mushrifah Al-Malki, PhD primary supervisor, 2019-

 

 

Previous research students

 

PhD

  • Dr Robert Miller, secondary supervisor (2016-19) [awarded]
  • Dr Paul Griffiths, secondary supervisor  (2013-16) [awarded]
  • Dr Alistair Barrow, secondary supervisor (2010-13) [awarded]
  • Dr Paul Towers, secondary supervisor (2010-13) [awarded]

Masters

  • Matthew Fildes, MMath, supervisor (2017-18) [successfully graduated]
  • William Pikett, MMath, supervisor (2017-18) [successfully graduated]
  • Sophie Jackson, MMath, supervisor (2016-17) [successfully graduated]
  • Li-Yu Chang, MSc, supervisor (2013-14) [successfully graduated]
  • Bo Hu, MSc, supervisor (2013-14) [successfully graduated]
  • Samia Ijaz, MSc, supervisor (2013-14) [successfully graduated

Teaching

Undergraduate & Postgraduate teaching

  • Fluid Instability, Transition and Turbulence (Year 4)
  • Mechanical Engineering: Fluid Dynamics (Year 1)

Press and media

Fluid dynamics transition to turbulence turbulent flow flow instabilities

Recent grant:

Determining the Effects of Competing Instabilities in Complex Rotating Boundary Layers

Activities

Membership of professional associations

  • Royal Aeronautical Society
  • American Physical Society
  • UK Fluids Network
  • Fellow of the HEA

Conferences

M. A. S. Al-Malki, Z. Hussain, S. J. Garrett, S. A. W. Calabretto (2021) On the boundary-layer flow over a rotating rough cone: energy eigenmode comparisons, Proceedings of the ICTAM 20.

J. Unadkat, Z. Hussain (2021) On the stability of boundary-layer flow over a rotating cone in an enforced axial free stream, Proceedings of the ISROMAC 18.

Z. Hussain, S.J. Garrett (2021) On the stability of boundary-layer flow over a rotating cone using new solution methods, Proceedings of the ISROMAC 18.

P. T. Griffiths, R. Miller, Z. Hussain, S. J. Garrett (2019). Temperature dependent boundary-layer flows. In: Proceedings of the 8th Bifurcations and Instabilities in Fluid Dynamics Symposium. Limerick, Ireland, 16/7/2019.

Z. Hussain, J. Unadkat, S. J. Garrett, S. O. Stephen (2018). Recent developments on the stability of boundary-layer flow over a rotating cone. In: Proceedings of the 1st UKFN Conference. Manchester, UK, 4/9/2018.

Z. Hussain (2016). Competing instabilities of rotating boundary-layer flows in an axial free-stream. In: Proceedings of the 16th ISROMAC 2016. Honolulu, USA, 10/4/2016.

Qualifications

Academic & professional qualifications

  • 2009 PhD in Applied Mathematics (University of Birmingham)
  • 2005 Advanced Studies in Mathematics - Part III (University of Cambridge)
  • 2004 BA Hons in Mathematics, MA (University of Cambridge)
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