Dr Martyn Hann

Dr Martyn Hann

Associate Professor of Coastal and Offshore Renewable Energy Engineering

School of Engineering, Computing and Mathematics (Faculty of Science and Engineering)




  • PhD - A numerical and experimental study of a multi-cell fabric distensible wave energy converter, University of Southampton
  • MPhys Physics with Study in New Zealand, University of Exeter



Teaching interests

I primarily teach on the MSc Coastal Engineering and BEng/MEng Civil and Coastal Engineering programs and am module leader for:

COUE509 - Coastal Engineering
COUE508 - Advanced Coastal Engineering Modelling
COUE300 - Coastal Engineering Analysis and Design

I also contribute to teaching on various Offshore Renewable Energy modules.



Research interests

My research interests are generally focused on Offshore Renewable Energy. I have worked on studies into various wave energy devices, including the Anaconda and SQ devices - both deformable devices. I have also led studies into floating tidal energy devices and am currently leading Plymouth's contribution to various floating offshore wind research projects. I am also interested in the modelling of extreme wave interaction with floating devices and the design of moorings and electrical cables within arrays of offshore renewable energy devices. 

Away from Offshore Renewable Energy I have carried out research into the interaction of two ships in close proximity and scour around monopiles. I am generally interested in all branches of physical modelling of wave, current and wind interaction with fixed and floating structures.

Grants & contracts

Current Funding:

  • EPSRC funded ‘Extreme Loading on FOWT under Complex Environmental Conditions’ 
  • EPSRC Supergen-ORE Flex-Fund project ‘Novel approaches for physical model testing of floating wind turbine platforms’
  • TIGER Interreg project

Previous Funding:

  • EPSRC grant EP/N008847/1 ‘A zonal CFD approach for fully nonlinear simulations of two vessels in launch and recovery operations’
  • EU Horizon 2020 - WETFEET - supervising scaled model tests of arrays of wave energy converters (WECs) with shared mooring components
  • InnovateUK Inter project - developing a floating tidal energy platform
  • EPSRC grant EP/M01956X/1, examining the use of a common power take-off within arrays of point absorber wave energy converters
  • Wave Energy Scotland ELASTO project - studying the use of deformable materials for wave energy converters



Key publications

Key publications are highlighted

Büttner T, Pérez-Collazo C, Abanades J, Hann M, Harper P, Greaves D & Stiesdal H (2022) 'OrthoSpar, a novel substructure concept for floating offshore wind turbines: Physical model tests under towing conditions' Ocean Engineering 245, , DOI Open access
Wang L, Robertson A, Jonkman J, Kim J, Shen Z-R, Koop A, Borràs Nadal A, Shi W, Zeng X & Ransley E (2022) 'OC6 Phase Ia: CFD Simulations of the Free-Decay Motion of the DeepCwind Semisubmersible' Energies 15, (1) , DOI Open access
de la Torre O, Hann M, Miles J, Stripling S & Greaves D (2022) 'Effect of the Current-Wave Angle on the Local Scour Around Circular Piles' Journal of Waterway, Port, Coastal, and Ocean Engineering 148, (1) , DOI
Tao J, Hann M, Greaves D & Shi H (2021) 'Numerical study of a point absorber wave energy converter with different power take-off systems' Ocean Engineering 242, 110181-110181 , DOI
Wang L, Robertson A, Jonkman J, Yu Y-H, Koop A, Borràs Nadal A, Li H, Bachynski-Polic E, Pinguet R & Shi W (2021) 'OC6 Phase Ib: Validation of the CFD predictions of difference-frequency wave excitation on a FOWT semisubmersible' Ocean Engineering 241, , DOI Open access
Davey T, Sarmiento J, Ohana J, Thiebaut F, Haquin S, Weber M, Gueydon S, Judge F, Lyden E & O’Shea M (2021) 'Round Robin Testing: Exploring Experimental Uncertainties through a Multifacility Comparison of a Hinged Raft Wave Energy Converter' Journal of Marine Science and Engineering 9, (9) 946-946 , DOI Open access
Howey B, Collins KM, Hann M, Iglesias G, Gomes RPF, Henriques JCC, Gato LMC & Greaves D (2021) 'Compact floating wave energy converter arrays: Inter-device mooring connectivity and performance' Applied Ocean Research 115, , DOI Open access
Han Z, Cao F, Hann M, Gong H, Liu S, Li M & Shi H (2021) 'Study on the capture spectrum of wave energy conversion' Applied Ocean Research 111, 102654-102654 , DOI
Giassi M, Thomas S, Tosdevin T, Engström J, Hann M, Isberg J & Göteman M (2020) 'Capturing the experimental behaviour of a point-absorber WEC by simplified numerical models' Journal of Fluids and Structures 99, 103143-103143 , DOI
Gomes RPF, Gato LMC, Henriques JCC, Portillo JCC, Howey BD, Collins KM, Hann MR & Greaves DM (2020) 'Compact floating wave energy converter arrays: Mooring loads and survivability through scale physical modelling' Applied Energy , DOI Open access
Ransley E, Brown S, Hann M, Greaves D, Windt C, Ringwood J, Davidson J, Schmitt P, Yan S & Wang JX (2020) 'Focused wave interactions with floating structures: A blind comparative study' Proceedings of the Institution of Civil Engineers: Engineering and Computational Mechanics , DOI Open access
Portillo JCC, Collins KM, Gomes RPF, Henriques JCC, Gato LMC, Howey BD, Hann MR, Greaves DM & Falcão AFO (2020) 'Wave energy converter physical model design and testing: The case of floating oscillating-water-columns' Applied Energy 278, 115638-115638 , DOI Open access
Musiedlak P-H, Ransley E, Hann M, Child B & Greaves D (2020) 'Time-Splitting Coupling of WaveDyn with OpenFOAM by Fidelity Limit Identified from a WEC in Extreme Waves' Energies , DOI Open access
Ransley E, Yan S, Brown S, Hann M, Graham D, Windt C, Schmitt P, Davidson J, Ringwood J & Musiedlak P-H (2020) 'A Blind Comparative Study of Focused Wave Interactions with Floating Structures (CCP-WSI Blind Test Series 3)' International Journal of Offshore and Polar Engineering 30, (1) 1-10 , DOI Open access
Faraggiana E, Whitlam C, Chapman J, Hillis A, Roesner J, Hann M, Greaves D, Yu Y-H, Ruehl K & Masters I (2020) 'Computational modelling and experimental tank testing of the multi float WaveSub under regular wave forcing' Renewable Energy , DOI Open access
Shi H, Zhao C, Hann M, Greaves D, Han Z & Cao F (2019) 'WHTO: A methodology of calculating the energy extraction of wave energy convertors based on wave height reduction' Energy 185, 299-315 , DOI Open access
Xie N, Hann M, Pemberton R, Iglesias G & Greaves D (2019) 'A numerical and experimental investigation of the effect of side walls on hydrodynamic model testing in a wave flume' Ocean Engineering 186, , DOI Open access
Antonini A, Raby AC, Brownjohn J, Pappas A & D'Ayala D (2019) 'Survivability assessment of fastnet lighthouse' Coastal Engineering , DOI Open access
Xie N, Iglesias G, Hann M, Pemberton R & Greaves D (2018) 'Experimental study of wave loads on a small vehicle in close proximity to a large vessel' Applied Ocean Research Open access
Thomas S, Giassi M, Eriksson M, Goteman M, Isberg J, Ransley E, Hann MR & Engström J (2018) 'A Model Free Control Based on Machine Learning for Energy Converters in an Array' Big Data and Cognitive Computing , DOI Open access
Thomas S, Eriksson M, Göteman M, Hann MR, Isberg J & Engström J (2018) 'Experimental and Numerical Collaborative Latching Control of Wave Energy Converter Arrays' Energies 11, (11) , DOI Open access
Thomas S, Giassi M, Göteman M, Hann MR, Ransley EJ, Isberg J & Engström J (2018) 'Performance of a Direct-Driven Wave Energy Point Absorber with High Inertia Rotatory Power Take-off' Energies (11) 2332-2332 , DOI Open access
Hann M, Greaves D, Raby A & Howey B (2017) 'Use of constrained focused waves to measure extreme loading of a taut moored floating wave energy converter' Ocean Engineering 148, 33-42 , DOI Open access
Kurniawan A, Chaplin J, Hann M, Greaves DM & Farley F (2017) 'Wave energy absorption by a submerged air bag connected to a rigid float' Proceedings of the Royal Society A , DOI Open access
Ning D-Z, Zhao X-L, Zhao M, Hann M & Kang H-G (2017) 'Analytical investigation of hydrodynamic performance of a dual pontoon WEC-type breakwater' Applied Ocean Research 65, 102-111 , DOI Open access
Ransley EJ, Greaves DM, Raby A, Simmonds D & Hann M (2017) 'Survivability of wave energy converters using CFD' Renewable Energy 109, 235-247 , DOI Open access
Kurniawan A, Chaplin JR, Greaves DM & Hann M (2016) 'Wave energy absorption by a floating air bag' Journal of Fluid Mechanics 812, 294-320 , DOI Open access
Goteman M, Engstrom J, Eriksson M, Leijon M, Hann M, Ransley EJ & Greaves DM (2015) 'Wave loads on a point-absorbing wave energy device in extreme waves' Journal of Ocean and Wind Energy 2, 176-181 , DOI Open access
Hann M, Greaves D & Raby A (2015) 'Snatch loading of a single taut moored floating wave energy converter due to focussed wave groups' OCEAN ENGINEERING 96, 258-271 Author Site , DOI Open access
Ransley EJ, Hann M, Greaves D, Raby AC & Simmonds D (2013) 'Numerical and physical modelling of extreme waves at Wave Hub' Journal of Coastal Research, Special Issue 65:1868-1873 30 Jun 201, Open access
Hann M & Perez-Collazo C (2018) 'Physical Modelling' in Greaves D; Iglesias Rodriguez JG Wave and Tidal Energy Wiley-Blackwell 233-288 Publisher Site , DOI
Conference Papers
Ransley EJ, Brown SA, Hann MR & Greaves DM (2021) 'A coupled rans-vof and actuator disk model for floating offshore wind turbines' 1474-1480 Open access
White A, Hann M, Miles J, Rawlinson-Smith R & Greaves D (2021) 'An univariate extreme sea state and extreme wind speed for an offshore wind turbine off the south coast of jamaica' 564-572
Tosdevin T, Jin S, Caio A, Simmonds D, Hann M & Greaves D (2021) 'Extreme responses of a hinged raft type wave energy convertor'
Wang D, Conley D, Hann MR, Collins KM, Jin S & Greaves D (2021) 'Power output estimation of WEC with HF radar measured complex representative sea states'
Ohana J, Gueydon S, Judge F, Haquin S, Weber M, Lyden E, Thiebaut F, O’Shea M, Murphy J & Davey T (2021) 'Round robin tests on a hinged raft wave energy converter'
Wang D, Conley D, Hann M, Collins KM & Greaves D (2019) 'Use of HF radar for replciating wave-current combined wave conditions for testing of wave energy converters' 13th European Wave and Tidal Energy Conference 9-/-0/20199-/-0/2019Open access
Howey B, Iglesias G, Collins KM, Hann M, Greaves D, Gomes R & Henriques JCC (2019) 'Wave energy converter arrays: Motion response of inter-connected array' 625-632 Open access
Thomas S, Giassi M, Göteman M, Eriksson M, Isberg JM, Hann MR, Ransley EJ & Engström J (2018) 'An accurate and cost efficient physical scale model of a direct driven point-absorber with constant damping power take-off' Proceedings of the 5th PRIMaRE Conference Bristol, UK 7-/-0/20187-/-0/2018Open access
Musiedlak P-H, Ransley EJ, Brown S, Child B, Hann MR, Iglesias G & Greaves DM (2018) 'Starting a wave structure interaction CFD simulation from an advance time: Hot-start' Proceedings of the 6th European Conference on Computational Mechanics (ECCM 6)/7th European Conference on Computational Fluid Dynamics (ECFD 7) Glasgow, UK 6-/-0/20186-/-0/2018Open access
Collins KM, Howey B, Vicente P, Gomes R, Harnois V, Hann M, Iglesias Rodriguez J & Greaves DM (2017) 'A Physical Mooring Comparison for a Floating OWC' 12th European Wave and Tidal Energy Conference Cork, Ireland 8-/-0/20178-/-0/2017Open access
Musiedlak P-H, Ransley EJ, Greaves DM, Hann MR, Iglesias G & Child B (2017) 'Investigation of model validity for numerical survivability testing of WECs' 12th European Wave and Tidal Energy Conference (EWTEC) Cork 8-/-0/20179-/-0/2017Open access
Brown SA, Greaves DM, Hann M, Kurniawan A & Forehand D (2017) 'Frequency Domain Modelling of a Compressible Wave Energy Device' 4th PRIMaRE Conference Southampton 7-/-0/20177-/-0/2017Open access
Engström J, Sjökvist L, Göteman M, Eriksson M, Hann M, Ransley EJ, Greaves D & Leijon M (2017) 'Buoy geometry and its influence on survivability for a point absorbing wave energy converter: Scale experiment and CFD simulations' 5th Marine Energy Technology Symposium (METS) Washington, D. C., USA 5-/-0/20175-/-0/2017Open access
Collins KM, Hann M, Iglesias Rodriguez G, Greaves DM, Vicente P & Harnois V (2016) 'Breakthroughs in WEC arrays Shared moorings and cablings in the WETFEET project' International Conference on Ocean Energy Open access
Göteman M, Engström J, Eriksson M, Leijon M, Hann M, Ransley EJ & Greaves DM (2015) 'Wave Loads on a Point-Absorbing Wave Energy Device in Extreme Waves' in Proceedings of the 25th International Offshore and Polar Engineering Conference Kona, Hawaii Big Island, USA 6-/-0/20156-/-0/2015Open access
Ransley EJ, Göteman M, Engström J, Jakobsen M, Eriksson M, Leijon M, Kramer M, Hann M & Greaves DM (2015) 'RANS-VOF Modelling of Wave Energy Converters' in Proceedings of the 2nd PRIMaRE Conference Penryn, UK 6-/-0/20156-/-0/2015Open access
Chaplin JR, Farley FJM, Kurniawan A, Greaves DM & Hann MR (2015) 'Forced heaving motion of a floating air-filled bag' 30th International Workshop on Water Waves and Floating Bodies Bristol 4-/-0/20154-/-0/2015
Kurniawan A, Greaves D, Hann MR & Chaplin J (2014) 'Multi-resonant compressible wave energy devices' 29th Intl Workshop on Water Waves and Floating Bodies Osaka, Japan 3-/-0/20144-/-0/2014
Vyzikas T, Ransley EJ, Hann M, Magagna D, Greaves D, Simmonds D, Magar V & Conley D (2013) 'Integrated Numerical Modelling System for Extreme Wave Events at the Wave Hub Site' in Proceedings of the ICE Conference on Coasts, Marine Structures and Breakwaters Edinburgh, UK 9-/-0/20139-/-0/2013Open access
Ransley EJ, Hann M, Greaves D, Raby A & Simmonds D (2013) 'Numerical and physical modelling of extreme waves at Wave Hub' in Proceedings of the 12th International Coastal Symposium 4-/-0/20134-/-0/2013Open access
Hann MR, Chaplin JR & Farley FJM (2011) 'Assessment of A Multi-Cell Fabric Structure as An Attenuating Wave Energy Converter' World Renewable Energy Congress – Sweden, 8–13 May, 2011, Linköping, Sweden Linköping University Electronic Press , DOI
Collins KM, greaves D, Hann M, Howey B, Iglesias rodriguez G & Harnois V (2016) D6.1 - Analysis of different potential configurations of non-rigid Inter-moored devices. Publisher Site
Presentations and posters
Collins KM, Arber P, Greaves D, Hann M, Iglesias G, Simmonds D, Stripling S & Toffoli A Collins KM, Arber P, Greaves D, Hann M, Iglesias G, Simmonds D, Stripling S & Toffoli A 'Facilitating coastal and ocean research in the laboratory' Open access
Musiedlak P-H, Greaves D, Ransley E, Iglesias G, Hann M & Child B Musiedlak P-H, Greaves D, Ransley E, Iglesias G, Hann M & Child B 'Geometric parameters for a 2D-Numerical Wave Tank' Open access
Musiedlak P-H, Greaves D, Ransley E, Hann M, Iglesias G & Child B Musiedlak P-H, Greaves D, Ransley E, Hann M, Iglesias G & Child B 'The validity of numerical models for testing the survivability of WECs' Open access