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Department of Maritime and Mechanical Engineering

Dr Mehdi Seddighi

Dr Mehdi Seddighi

Telephone: 0151 231 2095

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Mehdi holds a BSc in Aerospace Engineering and MSc in Aerodynamics from Iran, and a PhD in Mechanical Engineering from University of Aberdeen. He studied a PhD in Engineering (Fluid Mechanics) on Direct Numerical Simulation of unsteady turbulent-turbulent transient flows, from 2008-2011. Upon completion of his PhD, he joined University of Sheffield, was working as a Research Associate in Turbulence, on several EPSRC, industrial and departmental projects until September 2015 when he joined LJMU as a Lecturer/Senior Lecturer in Fluid Mechanics.

Research interests
- Unsteady turbulent flow (Numerical: DNS/LES; Experiment: PIV/LDV)
- Bypass transition in turbulent-turbulent transient flow (Smooth-wall, Rough wall)
- Control of turbulent flow
- Simulation of pulsatile blood flow
- Hydrodynamics
- Marine Renewable Energy
- Turbulent flow over rough surfaces

Web addresses

Current Projects
- On the Development of a Novel Approach in Modelling of Turbulent Pulsating Flows, EPSRC, £259,481, 2020-2022, PI, with Charles Moulinec (STFC Laboratories).
- Development of next generation of Anilox Rolls and Sleeves, Innovate UK, £396,431, 2019-2021, CoI, with Martin Sharp (PI).

Dr Seddighi is the director of study for the following PhD students:
1) Mr Khaled Takrouri
PhD title: Study of drag reduction over a novel textured surface
The project investigates detailed flow structure of flow over smooth and a novel textured surface, aiming at minimising the mean friction drag. The simulations are carried using our in-house DNS (Direct Numerical Simulation) and LES (Large Eddy Simulation) computer codes, CHAPSim. DNS is state-of-the-art approach in CFD (Computational Fluid Dynamics) to study detailed flow behaviour with no turbulence models, hence potentially provides the highest accuracy. The DNS code is parallelised using a hybrid MPI / MP approach by our group and has been used successfully on several projects.

2) Mr Jack Campbell
PhD title: Study of turbulence and heat transfer in pulsating flows
Despite extensive research available in the literature, on effects of pulsating flow with heat transfer, our understanding of turbulence behaviour and heat transfer in such flows is limited. The aim of this project is to investigate detailed turbulence structure and heat transfer performance in channel flows. The study will use Direct Numerical Simulations (DNS) and Large Eddy Simulations (LES) accompanied by investigation using PIV / LDV physical experiments.

3) Mr Leon Newton
PhD title: A study of modelling of turbulent flow over patterned and rough surfaces
The proposed PhD project aims to improve predictions, and reduce CFD simulation time, by studying detailed flow structure and friction drag on patterned surfaces and modelling these surfaces using the slip-length concept. The research will study both steady and unsteady flow conditions over various roughness regimes. The research will also investigate further our recent finding that the nature of turbulence response of a rough-wall transient channel flow starting from a steady turbulent flow resembles the boundary layer roughness-induced laminar-turbulent transition (Seddighi et al., 2015).

o Postdoctoral Positions

Postdoctoral Research Associate in Fluid Mechanics
Postdoctoral Research Associate in Computational Fluid Dynamics

o PhD positions
Dr Seddighi is currently seeking motivated students with strong background in physics or engineering for PhD projects on the following areas:
- Study of blood flow in arteries with atherosclerotic plaque rupture
- Control of turbulent flow using micro-patterned textured surfaces
- Turbulent-turbulent transient flow over smooth and rough surfaces

Current Teaching
- Fluid Mechanics I (Level 4)
- Fluid Mechanics III (Level 6) (Viscous flow, boundary layer theory, Blasius solution, von Karman's momentum integral equation)
- Engineering Analysis - CFD part (Level 6)
- Computational Fluid Dynamics (Level 7, MSc) (Introduction to CFD/Ipython Notebook, Steady diffusion problems ( Ipython Notebook; html), Introduction to numerical solution for linear algebraic equations, Steady convection-diffusion problems, Steady N.S. equation - SIMPLE algorithm, Unsteady N.S. equation – Chorin (projection) algorithm, Verification & Validation in CFD, Introduction to Turbulence - RANS)


Highlighted publications

Seddighi M, He S, Pokrajac D, O'Donoghue T, Vardy AE. 2015. Turbulence in a transient channel flow with a wall of pyramid roughness Journal of Fluid Mechanics, 781 :226-260 DOI Public Url

Journal article

Troelsen P, Wilkinson D, Seddighi M, Allanson D, Falkingham P. 2019. Functional Morphology and Hydrodynamics of Plesiosaur Necks: Does Size Matter? Journal of Vertebrate Paleontology, 39 DOI Author Url Publisher Url Public Url

Mathur A, Seddighi M, He S. 2018. Transition of Transient Channel Flow with High Reynolds Number Ratios Entropy, 20 DOI Publisher Url Public Url

Mathur A, Gorji S, He S, Seddighi M, Vardy AE, ODonoghue T, Pokrajac D. 2018. Temporal acceleration of a turbulent channel flow Journal of Fluid Mechanics, 835 :471-490 DOI Publisher Url Public Url

He S, He K, Seddighi M. 2016. Laminarisation of flow at low Reynolds number due to streamwise body force Journal of Fluid Mechanics, 809 :31-71 DOI Public Url

Seddighi M, He S, Pokrajac D, O'Donoghue T, Vardy AE. 2015. Turbulence in a transient channel flow with a wall of pyramid roughness Journal of Fluid Mechanics, 781 :226-260 DOI Public Url

He S, Seddighi M. 2015. Transition of transient channel flow after a change in Reynolds number Journal of Fluid Mechanics, 764 :395-427 DOI Publisher Url

Gorji S, Seddighi M, Ariyaratne C, Vardy AE, O'Donoghue T, Pokrajac D, He S. 2014. A comparative study of turbulence models in a transient channel flow Computers and Fluids, 89 :111-123 DOI

Seddighi M, He S, Vardy AE, Orlandi P. 2014. Direct numerical simulation of an accelerating channel flow Flow, Turbulence and Combustion, 92 :473-502 DOI Publisher Url

He S, Seddighi M. 2013. Turbulence in transient channel flow Journal of Fluid Mechanics, 715 :60-102 DOI

Seddighi M, He S, Orlandi P, Vardy AE. 2011. A comparative study of turbulence in ramp-up and ramp-down unsteady flows Flow, Turbulence and Combustion, 86 :439-454 DOI

He K, Seddighi M, He S. DNS study of a pipe flow following a step increase in flow rate International Journal of Heat and Fluid Flow, 57 :130-141 DOI Public Url

Conference publication

Seddighi M, He S. 2017. Turbulent-turbulent transient flow in a transitionally rough regime International Symposium on Turbulence and Shear Flow Phenomena, TSFP10

Khosh Aghdam S, Ricco P, Seddighi M. 2015. Turbulent drag reduction by hydrophobic surfaces with shear-dependent slip length 15th European Turbulence Conference

Seddighi M, He S, Vardy AE, O’Donoghue T, Dubravka P. 2015. Near-wall behaviour of transient flow in a channel with distributed 3-D roughness International Symposium on Turbulence and Shear Flow Phenomena, TSFP9

Seddighi M, He S. 2012. Turbulence structure in a rapidly accelerating channel flow DOI