Projects

Research

Research Fields 

- Linear and Non-Linear Hydrodynamic Analysis of Offshore Structures (Diffraction, Radiation, Exciting Loads and Motions using panel and analytical methods)
- Static and dynamic analysis and design of mooring systems
- Hydomechanic analysis of single or interconnected moored structures in frequency and time domain
- Linear and Non – linear dynamics of marine risers and slender marine structures
- Wave Energy
- Converters’ analysis and efficiency evaluation (heaving devices, OWC’s concepts).
- Floating Structures Applications (Floating Wind Turbine analysis and design, Fishing Farms)
- Analysis and design of oceanographic surface buoys and underwater gliders
- Wave propagation in harbors and motions of moored ships in harbors

Participation in Thematic Networks and
International Bodies


- FLOATTECH: Floating Structures Technology, DG Research, 2002-2006 (μοναδικός Ελληνικός φορέας)
Coordinated Action on Ocean Energy (2003-2007)
- Member European Association of Ocean Energy (2007 -)
- International Ship and Offshore Structures Congress (ISSC, 1988 -) 

Specialized Services

- Mavrakos, S.A., Chatjigeorgiou, J.: «Floating Thermal Station and Anahita Island”, Final Evaluation Report submitted to the WEGEMT for the EU program VISIONS (2008), September 2008.
- Mavrakos, S.A.: «Wave propagation and motion response analysis of large Cruiser ships berthed in the new Katakolo Harbor” (in Greek), Supported by the Prefecture of Western Greece, Technical Report, Laboratory for Floating Structures and Mooring Systems, NTUA, June, 2007.
- Mavrakos, S.A.: “Coupling of dynamically positioned large modular structures”, Final evaluation report submitted to the WEGEMT for the EU program VISIONS (2007), October 2007.
- Mavrakos, S.A.: “Interrelations between vessels and their behavior in wind and waves”, Final evaluation report submitted to the WEGEMT for the EU program VISIONS (2007), September 2007.
- Mavrakos, S.A.: “Investigation of the in-situ modularization and connection possibilities of the wind farm modulus and their transport to the assembly location”, Final evaluation report submitted to the WEGEMT for the EU program VISIONS (2006), December 2006.
- Mavrakos, S.A.: “Investigation of the Seaworthiness of a floating Wind Farm using suitable materials due to extreme environmental conditions”, Final evaluation report submitted to the WEGEMT for the EU program VISIONS (2006), November 2006.
- Mavrakos, S.A., G. Katsaounis: “Hydrodynamic Analysis and Efficiency Evaluation of a tightly moored wave energy converter”, Technical Report to the KIMATIKI ENERGEIA S.A., School of Naval Architecture and Marine Engineering, September 2004.
- Mavrakos, S.A.: “Preliminary design of a floating garage for the Volos Harbor”, Technical Report to the Volos Harbor Authorities, 2003.
- Mavrakos, S.A., Asorakos, S., Papazoglou, V.J. and Loukakis, T.A.: “Development and Design of a New Concept for Open Sea Fish Farming” (in Greek), Final Technical Report to THALASSA S.A., Department of Naval Architecture and Marine Engineering, January 1994.
- Mavrakos, S.A.: “Feasibility study for the Perama Ship repair area: Description and evaluation of the excising problems. Influence of the Perama Ship repair activities to the environmental conditions of the broader area” (in Greek), Supported by the Prefecture of Attika, Dec. 1993.
- Mavrakos, S.A., Asorakos, S., Papazoglou, V.J. and Loukakis, T.A.: “Feasibility Study for the Development of Floating Swimming Pools” (in Greek), Final Technical Report to Touliel S.A., November 1991.

Research Achievements 

- Hydrodynamic analysis of large offshore structures
- Numerical and experimental investigation of the hydrodynamic behavior of large offshore structures
- Hydrodynamic analysis of large floating infrastructures
- Analysis of multi-purpose offshore installations for the wind energy sources exploitation and storage
- Hydrodynamic analysis of offshore structures at low forward speed
- Hydrodynamic analysis of vertical cylinders
- Hydrodynamic analysis of vertical cylinders with moon pools: Application to oscillating water column wave energy converters
- Non-linear hydrodynamic analysis of vertical cylinders
- Mooring analysis of single and multi – leg systems
- Slender marine structures dynamic analysis – Risers’ dynamics
- Higher-order hydrodynamic analysis end efficiency evaluation of Wave Energy Converters – WEC’s
- Floating Structures Applications
- Analysis and design of oceanographic buoys
- Design of underwater oceanographic glider
- Wave Propagation in harbors
- Motions of ships and floating structures in harbors 

Ongoing Research Programs

- Sector Adaptive Virtual Early Warning System for Marine Pollution, SEAVIEWS (2020-2022). Project co-funded by the European Regional Development Fund and the Greek Programme of Public Investments; Budget: 380,735€. (Scientific Responsible: Assoc. Prof. I.K. Chatjigeorgiou)
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- Feasibility Study of Innovated Materials for Offshore Fish Cage Nets – Numerical and Experimental Investigation Under Realistic Loading Conditions, MATISSE (2019-2022). Project funded by the Hellenic General Secretariat of Research and Technology; Budget: 200,000€.(Scientific Responsible: Assoc. Prof. I.K. Chatjigeorgiou)

- Blue Growth Community – Capitalization Project for Blue Economy Innovation in the Mediterranean, BG2 (2019-2021). Project co-funded by the European Regional Development Fund and the Greek Programme of Public Investments; Budget: 179,995€ (85% – European Union (MED Programme)
15% – Project co-financing). (Scientific Responsible: Assoc. Prof. I.K. Chatjigeorgiou)
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Completed Research Programs

- Horizontal Communication & Capitalization Project for the Innovation in Blue Growth at Mediterranean Level, InnoBlueGrowth (2016-2019). Project co-funded by the European Regional Development Fund and the Greek Programme of Public Investments; Budget: 252,775€ (Scientific Responsible: Assoc. Prof. I.K. Chatjigeorgiou) .

Increasing Safety of Offshore Wind Turbines Operation: Study of the Violent Wave Loads, SAFEMILLS (2014-2016). Project funded by the FP7 Program PEOPLE, Marie Curie Intra-European Fellowships for Outstanding Researchers; Budget: ~320,000€.

- Hydroelastic Behavior of Vertical and Steel Frames Subjected to Third-Order Hydrodynamic Loading, HELASFR (2013-2015), Sponsored by the Hellenic General Secretariat of Research and Technology under the R&D Greek-France cooperation (Scientific Responsible: Assoc. Prof. I.K. Chatjigeorgiou)

- “Multi-purpose floating structures for offshore wind and wave energy sources exploitation (POSEIDON)”, Three years program (2012 – 2015), Supported by the Greek General Secretariat for Research and Technology, Program ARISTEIA 2011, (Prof. S.A. Mavrakos coordinator and scientific responsible)

- “Setting-up of a National Program for the exploitation of the offshore wind energy sources in the Aegean Sea”, Three years program (2011- 2014), Supported by the Greek General Secretariat for Research and Technology, Program SYNERGASIA 2009, Partners: Center for Renewable Energy Sources (CRES), National Technical University of Athens, National Center for Marine Research (NCMR), ELICA A., ENTEKA AE, EXERGIA AE, X. ΡΟΚΑΣ ΑΒΕΕ, TERNA ΕΝΕΡΓΕΙΑΚΗ ΑΒΕΤΕ, JASPER ΑΙΟΛΙΚΗ ΕΛΛΑΔΟΣ ΑΕ, (Prof. S.A. Mavrakos scientific responsible for the part of the work conducted in NTUA)

- Self – sustained research program for the analysis and design of the dynamic behavior of floating systems for the offshore wind and wave energy sources exploitation, Sponsored by the Research Committee of NTUA, 2011 – 2016, Scientific Responsible: Prof. S.A. Mavrakos

- Hydrodynamic analysis of floating oscillating water column wave energy devices for offshore applications, Three-year program (1/9/2010 – 31/8/2013), Sponsored by the Greek Ministry for Education, Long-life learning and Religions, HERACLITOS II Program, Contract No MIS346725, (Scientific Responsible: Prof. S.A. Mavrakos)

- Dynamic response of floating offshore wind turbines under random waves and wind action, funded by the EU within the 7th FP under the action: “Integrated Infrastructure Initiative HYDRALAB IV: Assess to major experimental facilities”, carried out in DHI Wave Basin, Copenhagen, Denmark (Scientific responsible for the NTUA part: Prof. S.A. Mavrakos), October 2012.

- Motion response analysis of two cable – laying ships (ASTREA and CREOUSSA), Sponsored by the KREOUSSA Shipping Company Ltd., Dec. 2011 – March 2012, (Scientific Responsible: Prof. S.A. Mavrakos)
Measurements of hydrodynamic forces and motions on concentric vertical cylinders, Sponsored by the EU within the 6th FP under the action: “Integrated Infrastructure Initiative HYDRALAB III: Assess to major experimental facilities” carried out in the wave basin of EL PARDO, Madrid, Spain (Canal de Experiencias Hidrodinamicas de El Prado -CEHIPAR), Scientific Responsible: Assoc. Prof. I. Chatjigeorgiou, November 2009.

- Hydrodynamic analysis of the cable – laying vehicle “ATALANTI”, Sponsored by the KREOUSSA Shipping Company, Ltd., July 2009, (Scientific Responsible: Prof. S.A. Mavrakos)

- Experimental and numerical evaluation of the drift forces on a floating body of simple geometry (vertical cylinder), Sponsored by the EU within the 6th FP under the action: “Integrated Infrastructure Initiative HYDRALAB III: Assess to major experimental facilities” carried out in DHI Wave Basin, Copenhagen, Denmark Contract No: 022441 (RII3), (Scientific responsible for the NTUA part: Prof. S.A. Mavrakos), June 2009.

- “Measurements of drift forces, wave run-up and air gap on offshore structures”, Research Project sponsored by the European Commission in the framework of the “Transnational Access to Research Infrastructures”, carried out in the wave basin of EL PRADO MODEL BASIN (Canal de Experiencias Hidrodinamicas de El Prado, Madrid, Spain), 2007, (Scientific Responsible: Assoc. Prof. I.K. Chatjigeorgiou).

- Parametric evaluation of the flow field and the collision energy on the side walls of the Corinth channel during the towing procedure of large cruisers, sponsored by the CORINTH CHANNEL S.A., 2006, (Scientific Responsible: Prof. S.A. Mavrakos).

- Wave – Current – Vertical Cylinder Array interaction, Two-year research project (1.1.2005 – 31.12.2006), sponsored by the Greek Ministry for Education, PYTHAGORAS II (Scientific Responsible: Assoc. Prof. I.K. Chatjigeorgiou).

- LABBUOY: «Economically Efficient Floating Device for Wave Power Conversion into Electricity; Phase I: Mathematical and Physical Model Testing», Two-year (1/1/2002 – 31/12/2003), European Research Project, sponsored by the Direction General for Energy (Scientific Responsible for the NTUA part: Prof. S.A. Mavrakos).

- «Hydrodynamic analysis for the change in use of the Jack-up “ANDROS”, one-year project (2001) sponsored by the Greek construction company ATHENA S.A. (Scientific Responsible: Prof. S. A. Mavrakos).

- “Mapping of the sea bed in the Golf of Lefka, Island of Nisiros”, Program of the Underwater Archaeological Authority of Greece, sponsored by the Ministry for Culture No ΥΠΠΟ/ΑΡΧ/Α1/Φ41/30517 /1870, carried out in collaboration with the National Centre for Marine Research (NCMR) and the Ocean Engineering Department of the Massachusetts Institute of Technology (MIT), June 2001 (Scientific Responsible from the site of the School of Naval Architecture and Marine Engineering in the field tests: Prof. S.A. Mavrakos)

- “Updating of the Post-Graduate Program in “Marine and Ocean Technology and Science” in the School of Naval Architecture and Marine Engineering, NTUA, Supported by the Greek Ministry for Education and Religions, 1/9/2001 - 31/12/2003 (Scientific Responsible: Prof. S. A. Mavrakos)

- «Design of floating offshore structure for the deployment of the instrumentation for the neutrino monitoring Laboratory NESTOR”, one-year project (2000), sponsored by the NESTOR Laboratory (Scientific Responsible: Prof. S.A. Mavrakos)

- “Optimization of the design procedures for harbor works: Application to the Harbors of Alexandroupoli, Lagos and Kavala”, sponsored by the Greek General Secretariat for Research and Technology, 1996-1998 (Scientific Responsible for the NTUA’s part: Prof. S.A. Mavrakos).

- “Design of the Mooring System for three Floating Docks”, sponsored by the Greek Navy, 1995 (Scientific Responsible: Prof. S.A. Mavrakos).

- “Mooring system design for a pipe-laying vessel operating in the route Igoumenitsa-Corfu”, sponsored by the Greek Company FULGOR S.A., 1995 (Scientific Responsible: Prof. S. A. Mavrakos).

- “Mooring system design for a pipe-laying vessel operating in the route Preveza-Corfu”, consultant service sponsored by the Greek Company FULGOR S.A., 1994 (Scientific Responsible: Prof. S. A. Mavrakos).

- “Offshore Wave Energy Converters (OWEC-1)”, sponsored by the General Directorate for Research and Development, Program JOULE II, EU, 1993-1995 (Scientific Responsible for the NTUA’s part: Prof. S.A. Mavrakos).

- “Experimental and numerical investigation on the hydrodynamic behavior of floating breakwaters”, sponsored by the Greek General Secretariat for Research and Technology, 1993-1995 (Scientific Responsible: Prof. S.A. Mavrakos).

- “Deep Water Sub-sea System Servicing through the Surface: A Technology Transfer”, sponsored by the Energy Directorate (THERMIE Program), C.E.C., 1991-1994 (Scientific Responsible: Prof. S.A. Mavrakos).

- “Design Rules for floating Marinas”, sponsored by the Hellenic Tourism Organization, 1989-1990 (Scientific Responsible: Prof. S.A. Mavrakos).

- “Use of Buoys to Reduce Static and Dynamic Tension in Deep Water Mooring Lines: A Pilot Study”, sponsored by the Hydrocarbon Division, Energy Directorate, EU, in collaboration with TECHNOMARE S.A. (Italy), 1988-1990 (Scientific Responsible for the NTUA’s part: Prof. S.A. Mavrakos).

- “Feasibility Study for Deep Water Anchoring Systems”, sponsored by the Hydrocarbon Division, Energy Directorate, EU, 1986-1988 (Scientific Responsible: Prof. S.A. Mavrakos).

- Wave current interaction with vertical cylinders, Sponsored by the EU in the framework of METRI – 2 (Marine Environment Tests and Research Infrastructure 2) program, Contract Nr. HPRI-CT-2001-156. The experimental campaign was carried out in IFREMER, Brest, France, (Scientific responsible: Prof. S.A. Mavrakos), May 2009.

- “Co-ordination action on Ocean Energy”, three-year (1.10.2004 – 30.9.2007) project, sponsored by the European Commission, Contract No: 502701, carried out in collaboration with 40 European Institutions from the Academia, Industry and Developer, (Scientific Responsible for the NTUA part: Prof. S. A. Mavrakos).

- “Hydrodynamic and Hydroelastic Analysis of moored floating or constrained vertical axisymmetric bodies for applications as wave energy converters”, three-year research project (1.3.2004 – 28.2.2006), sponsored by the Greek Ministry for Education, Program PYTHAGORAS (Scientific Responsible: Prof. S.A. Mavrakos).

- “Gas Import Floating Terminal – GIFT”, Two-year research project (1.2.2005 – 31/1/2007), sponsored by the Direction for Transport, EU, Project No: 012404, in collaboration with DORIS Engineering (France), LMC (UK), DnV (Norway), CAT(France), Ship Design Laboratory of the National Technical University of Athens (Greece), (Scientific Responsible of the NTUA-Marine Division Part: Prof. S. A. Mavrakos).

- “Design of an autonomous underwater oceanographic monitoring vehicle droved by changing buoyancy”, Three-year project, sponsored by the Greek Secretariat for Research and Technology, PENED 2003 and the private company AMTECH Ltd., (Scientific Responsible: Prof. S.A. Mavrakos).

- «Development and Construction of a Prototype Electricity generation plant from sea waves”, two-years project (1/12/2001 – 30/11/2003) sponsored by the Greek General Secretariat for Research and Technology, carried out in collaboration with the Greek Construction Company ATHENA, S.A., The National Center for Renewable Energy (Scientific Responsible for the NTUA’s part: Prof. S.A. Mavrakos).

- «Thematic Network on Floating Structures Technology – FLOATECH», four-year (1.7.2001 – 30.6.2005) research project sponsored by the General Direction for Research of the E.U. in collaboration with 37 European institutions form the Academia and Industry (Scientific responsible for the NTUA’s: Prof. S.A. Mavrakos).

- «Development of Rules and Regulations for the Design, Construction and Certification of Floating Marinas and Floating Recreational structures”, two-year (1999 – 2001) research project PAVET (97ΒΕ142) sponsored by the Hellenic Register of Shipping (Scientific Responsible for the NTUA’s part: Prof. S.A. Mavrakos).

- “Development of a Post - Graduate Course in “Marine and Ocean Engineering and Science” in the School of Naval Architecture and Marine Engineering, NTUA, Supported by the Greek Ministry for Education and Religions, 1/1/1997 - 29/2/2000 (Scientific Responsible: Prof. S.A. Mavrakos) 

Address

LABORATORY FOR FLOATING STRUCTURES AND MOORING SYSTEMS
School of Naval Architecture and Marine Engineering, N.T.U.A.
Building Λ, Zografos Campus
Iroon Polytechniou 9
15780, ZOGRAFOS, ATHENS, GREECE


Contact

Secretariat: E. Kaloutsa 
Tel: +30 210 7722872
Fax: +30 210 7721412
e-mail: ekaloutsa@naval.ntua.gr

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