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D. George Mermiris University of Strathclyde-Glasgow


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Presentación del ponente D. George Mermiris MREDS, University of Strathclyde-Glasgow, en la Jornada Transnacional "Demostración Tecnológica en la Industria Auxiliar del Naval" Realizada el 26 de enero …

Presentación del ponente D. George Mermiris MREDS, University of Strathclyde-Glasgow, en la Jornada Transnacional "Demostración Tecnológica en la Industria Auxiliar del Naval" Realizada el 26 de enero de 2010, en Santiago de Compostela

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  • 1.
  • 2. The Ship Stability Research Centre (SSRC) ExpertiseGeorge MermirisResearch Fellow
    Presentation on the 26th of January in Galicia, Spain
  • 3. Outline
    SSRC Introduction
    Decision-support systems
    Damage stability & survivability
    Software platform for RBD implementation and tool integration
    Multi-objective / Multi-criteria design optimisation
    Marine hydrodynamics (Potential code, RANSE, SPH, etc.)
    Onboard systems availability
    Fire simulation
    Evacuation and pedestrian dynamics simulation (EVE/EVI)
    Crashworthiness and residual strength assessment
    Utilisation of databases in design and operation
    Energy efficiency of ships and ship systems (DEMO)
  • 4. University of Strathclyde, Glasgow (
    Member of the Department of Naval Architecture and Marine Engineering (
    SSRC Introduction
  • 5. SSRC Introduction
    Mission statement
    “To tackle, from a foundation of academic strength, problems of fundamental, strategic and applied nature, aiming to enhance understanding and knowledge in the fields of ship dynamics, stability andsafety and to contribute to the development of cost-effective solutions and application to best practice of ship design/operation/regulation”
  • 6.
    • To develop critical technologies of measuring safety level by addressing operational, extreme, accidental and catastrophic scenarios, accounting for the human element, and integrate these into a design environment
    • 7. To develop and implement effective procedures for safe, secure and economic operation of ships and for enhanced training
    • 8. To establish suitable risk-based-life-cycle design and regulatory frameworks to facilitate the implementation of first principles approaches to safety assurance
    • 9. To bridge the technological gapbetween front end research and industry best practice, to offer enhanced safety through innovation
    SSRC Introduction
  • 10. Director: Prof. Dracos Vassalos
    Staff: 20
    8 ongoing research projects
    SSRC Introduction
  • 11. Decision-support system (Integrated Standard - iSTAND)
    Monitoring of ship status
    – Monitoring of sensors / alarms concerning flooding / fire / explosion /
    – Status of relevant actuators (WT doors, valves, slide doors,, fire fighting, etc.)
    • Diagnosis / Prognosis
    – Evaluation of time evolution of ship status (current and forecast)
    – Evaluation of residual functionality of pertinent critical systems
    – Evaluation of mustering / abandonment, as appropriate
    – Evaluation of proposed actions by operator (e.g., compartment sealing, bilge
    pump activation, boundary cooling and so on)
    • Advising
    – Proposed procedure to be followed for the specific emergency and current
    ship condition, supported by suitable advisory information.
    – Dynamic evaluation of the proposed procedure based on new ship status and
    the result of actions taken
    • Execution and follow-up
    – Execution of the proposed procedure
    – Triggering of actions
  • 12. Decision-support system (Integrated Standard - iSTAND)
  • 13. Damage stability & Survivability
    Parametric subdivision and layout for damage stability and survivability in conceptual ship design
    Addition of
    watertight subdivision above freeboard deck.
  • 14. Damage stability & Survivability
    In order to study the behaviour of the damaged ship in waves we need to produce as detailed a model of it as possible
    Through time-domain simulations we get information about ship movements and flood water mass and location as well as floating position and ship dynamics.
  • 15. Damage stability & Survivability
    Visualisation of the test cases can allow us to follow the flood water progress and trace any vulnerabilities in a particular design
    We can also determine the significant wave height a ship can survive so as to check compliance with damage stability regulations
  • 16. Damage stability & Survivability
    The process can be verified and enhanced by physical experimenting. Again the models used are highly elaborate and detailed and testing is carried out for various loading conditions and sea states as well as various damage cases.
  • 17. Damage stability & Survivability
  • 18. Damage stability & Survivability
    - SAFEDOR (
    - GOALDS (N/A)
    • Jasionowski, A, "Fast and accurate flooding prediction - analytical model," SAFEDOR, D2.1.3. , November 2006.
    • 19. Jasionowski, A, Vassalos, D, Scott, A, “Ship Vulnerability to Flooding”, 3rd International Maritime Conference on Design for Safety, Berkeley California, Sept 26 28th, 2007.
    • 20. Jasionowski, A, Vassalos, D, “Technical Summary of the Investigation on The Sinking Sequence of MV Estonia”, Safety at Sea Report No VIES01-RE-005-AJ, May 2008.
  • RBD Implementation / Tool integration
    Integration of tools to carry out design spiral activities
    Centralised control of design process
    Access to parametric data and files
    Instant reflection of any design change in all design objectives
    Result visualisation
    Data analysis & decision support
    Data dependency analysis
    Design iterations/versions
    Integrated tools and data
    Comparison of design versions
  • 21. RBD Implementation / Tool integration
    - SAFEDOR (
    Integration of design (NAPA) and risk estimation (fire and flooding risks by SSRC) and various simulation (evacuation, smoke/heat propagation by SSRC) tools for carrying out Risk Based Design
    • VIRTUE (
    Integration of various CFD and design tools for comprehensive hydrodynamic optimisation; coupling RANSE and potential codes
    - BESST
    Integration of design and risk estimation tools for sensitivity analysis
    1. Vanem E., Puisa R., and Skjong R., ‘Standardized risk models for formal safety assessment of maritime transportation’, in Proceedings of the ASME 28th International Conference on Ocean, Offshore and Arctic Engineering, May 31 – June 5, 2009, Honolulu, Hawaii, USA.
    2. Puisa, R. and Vassalos, D., 'Design for safety with minimum life-cycle cost', 10th International Conference on Stability of Ships and Ocean Vehicles, St. Petersburg, Russia, 2009.
    3. Puisa, R. and Vassalos, D. ‘Deriving parametric models for goal-based design of ship concepts’, in the International Conference on Computer Applications in Shipbuilding (ICCAS 2009), 1-3 September 2009, Shanghai, China.
  • 22. Multi-objective / Multi-criteria design optimisation
    Global parametric model
    Software integration is key to carry out optimisation in RBD
  • 23. Multi-objective / Multi-criteria design optimisation
    • SAFEDOR (
    Optimisation of passenger ships (cruisers and ropax) towards maximum safety level (flooding + fire risks), maximum space functionality, minimum building and operational costs, maximum earnings
    • VIRTUE (
    - Propeller – rudder – hull optimisation
    - Cavitating propeller optimisation with new developed cavitaiton models (RANSE + panel codes)
    Tsakalakis, N., Vassalos, D. and Puisa, R., ‘Goal-based subdivision and layout’, in 10th International Conference on Stability of Ships and Ocean Vehicles, St Petersburg, 2009.
  • 24. Marine hydrodynamics
    - EFFISES (Air-lifted catamaran)
    Air-hydrodynamics, dynamic stability, wash wave prediction, 3d planing
  • 25. Marine hydrodynamics
    Xie N, Vassalos D, Jasionowski A, Sayer P: “A Seakeeping analysis for an air-lifted catamaran”, Ocean Engineering, vol 35, pp1512-1520, 2007.
    Xie N, Vassalos D, Jasionowski A: “A study of hydrodynamics of 3d planing surface”, Ocean Engineering, vol.32, pp1539-1555, 2005.
    Xie N, Jasionowski A, Vassalos D: “Evaluation of wash wave of the air-lifted catamaran”, PRADS’04, 2004, Germany.
    Xie N, Jasionowski A, Vassalos D: “A numerical method for prediction of wash waves of SES”, Journal of Ship Mechanics, vol.8, No.6, 2004.
    Xie N, Vassalos D: “Performance analysis of 3D hydrofoil under free surface”, Ocean Engineering, vol.34, pp1257-1264, 2007
    Vassalos D, Xie N, Jasionowski A, Konovessis D: “Stability and safety analysis of the air-lifted catamaran”, Journal of Ship and Offshore Structures, vol.3, No.2, pp91-98,2008.
  • 26. Marine hydrodynamics
    Performance of High Speed Craft, hydrofoil, Resistance prediction with 3D panel method, yacht, multi-hull, hydrofoil, motion prediction with ride control, etc.
  • 27. Marine hydrodynamics
  • 28. Marine hydrodynamics
    Xie N, Vassalos D, Sayer P: “The Effect of lift on the wave-making resistance of multi-hull craft”, International Shipbuilding Progress, vol. 54, No.2-3, pp83-95, 2007.
    Xie N, Vassalos D: “A study of effect of steady flow on unsteady motion of high speed craft”, Proceedings of International Maritime Association of the Mediterranean Conference, 2005.
    Xie N, Vassalos D: “Performance analysis of 3D hydrofoil under free surface”, Ocean Engineering, vol.34, pp1257-1264, 2007
  • 29. Marine hydrodynamics
    - VIRTUE (
    Prediction of roll hydrodynamic property of ship with RANSE
  • 30. Marine hydrodynamics
    Xie N, Vassalos D, Lee B S: “Prediction of roll hydrodynamics of cylinders fitted with bilge keel with RANSE”, Journal of Ship Mechanics, vol.10, No.6, pp839-847, 2007.
    Xie N, Vassalos D: “Numerical prediction of hydrodynamics of plate in forced roll oscillation on the free surface”, to be published.
  • 31. Marine hydrodynamics
    Performance simulation of a marine salvage system consists of disabled tanker,
    sea anchor and towing line in wind, wave and current;
    • Research contents:
    • 32. Determination of environment force (including 2nd order wave force);
    • 33. Simulation of behaviour of the ship-anchor-line system in wind, wave and current;
    • 34. Prediction of drifting velocity of the distressed ship before and after using the salvage system;
    • 35. Estimate of extreme loads in the towing line during the operation.
  • Marine hydrodynamics
    Parachute sea anchor
    Towing line
  • 36. Marine hydrodynamics
    Small Particle Hydrodynamics SPH
    This meshless code could solve strong nonlinear free surface flows easily and efficiently. With parallel technique, 3D case with millions of particles could come true. Sloshing, slamming and flooding cases have been investigated so far.
  • 37. Marine hydrodynamics
    Sloshing wave height
    3D sloshing
    Slamming force
    Wedge slamming
    Ship slamming
  • 38. Marine hydrodynamics
    3D Instant flooding
    Passenger/RoRo ship flooding
    Wave height in damaged compartment
  • 39. Marine hydrodynamics
    - VIRTUE (
    L.Shen, D,Vassalos, Applications of 3D Parallel SPH for Sloshing and Flooding. P. 723-733, 10th International Conference on Stability of Ships and Ocean Vehicles
  • 40. Marine hydrodynamics
    Numerical investigation on the impact of dam break flow on a structure
  • 41. Marine hydrodynamics
    Numerical study on tank sloshing
  • 42. Marine hydrodynamics
    Numerical simulation of water flooding into a damaged compartment
  • 43. Marine hydrodynamics
    - VIRTUE (
    - SHOAL (
    Gao, Z., Vassalos, D., Gao, Q., “A multiphase CFD method for prediction of floodwater dynamics”, Proceedings of the 10th International Conference on Stability of Ships and Ocean Vehicles, St. Petersburg, p. 307-316, 2009
  • 44. SHOAL (
    SHOAL is a collaborative project under FP7 Its main objective is the searching and monitoring of Harmful contaminants, other pollutants and leaks in vessels in port using a swarm of robotic fish.
    Role of SSRC:
    • Analysis and validation of hydrodynamic performance of robotic fish
    • 45. Simulation of robotic fish movement
    • 46. Experiment studies of robotic fish motion
    • 47. Assessment of robotic fish design
    Marine hydrodynamics
  • 48.
    • Q. Gao, D. Vassalos “The Study of Hull-Propeller Interaction by RANSE”, the 6th International Workshop on Ship Hydrodynamics, Jan 9-12, 2010, Harbin
    • 49. Q. Gao, D. Vassalos “Simulation of wave effect on ship hydrodynamics by RANSE”, STAB, St Petersburg, June, 2009
    • 50. Q. Gao, D. Vassalos, “Computational Hydrodynamic Derivatives by Numerical PMM”, RINA MARINE-CFD, Southampton, 26 March 2008
    • 51. Q. Gao, D. Vassalos “Computational hydrodynamic derivative”, ISOPE-2007 Lisbon Paper No 2007-JSC-152
    • 52. Q. Gao, V. Shiganov, D. Vassalos “Numerical Simulation of Yaw Effect”, 4th International Conference on Marine Hydrodynamics, Mar. 2005, Southampton
    • 53. Q. Gao, “Numerical Simulation of Damage Ship Flooding”, 7th Numerical Towing Tank Symposium, Hamburg, Oct. 2004
    • 54. Q. Gao, Dracos Vassalos “Numerical Simulation of Free Surface Flow around KCS”, International Symposium on Naval Architecture and Ocean Engineering, Shanghai, Sep. 2003
    L.Shen, D,Vassalos, Applications of 3D Parallel SPH for Sloshing and Flooding. P. 723-733, 10th International Conference on Stability of Ships and Ocean Vehicles
    Gao, Z., Vassalos, D., Gao, Q., 2009. A multiphase CFD method for prediction of floodwater dynamics. In: Proceedings of the 10th International Conference on Stability of Ships and Ocean Vehicles, St. Petersburg, 307-316.
    Marine hydrodynamics
  • 55. Manoeuvring
  • 56. Manoeuvring
    • SafeCrafts : Development of novel LSA system
    • 57. Assessment of manoeuvring behaviour in severe weather
    • 58. ShipArrestor : Development of novel savage system
    • 59. Performance of salvage system by ship motion simulation
    • 60. SAFEDOR (
    • 61. Benchmark test for parametric roll phenomenon
    Publications: N/A
  • 62. A
    Systems availability
    Integrated platform combining probabilistic stability framework with Boolean toolbox for qualitative and quantitative assessment of availability of onboard systems and functions.
    {& A {| B C}}
  • 63. Systems availability
    Quantification of spatially distributed systems by means of unavailability rates and performance for static and dynamic structures.
  • 64. Systems availability
    Real-time system assessment for decision support platform in service and emergencies.
    Real-time automatic and semi-automatic action design for crisis management and casualty mitigation (e.g. Bilge/Ballast actions within iStand survivability module).
    Interactive restoring-actions module for system/function restoration.
  • 65. Systems availability
    SAFEDOR WP 3.4 – Tool development
    SAFEDOR WP 6.12 – Application to the Preliminary Approval process
    iStand – Development and implementation of real-time functionality and restoration services.
    Commercial use:
    Safe Return To Port compliance for concept design of cruise vessel
    Integration with onboard DSS
    J. Cichowicz, D. Vassalos, J.Logan “Probabilistic Assessment Of Post-Casualty Availability Of Ship Systems”, Proceedings of the 10th International Conference on Stability of Ships and Ocean Vehicles, Sankt-Petersburg, Russia
  • 66. Fire consequence simulation
    Modelling Fire and Smoke propagation using the Zone Model concept employed in different software (CFAST, Raeume etc…)
    Temperature histories
    Smoke layer history
  • 67. Fire consequence simulation
    Modelling Fire Spread and Smoke propagation using Field Models or CFD (FDS, Fluent etc…)
    Temperature contours
    Finite Volume Discretization
  • 68. Fire consequence simulation
    Fire and Smoke propagation simulated by FDS
    Smoke propagation
    Fire simulation integrated with evacuation models to get fatalities
  • 69. Fire consequence simulation
    • SAFEDOR (design, regulation and operation for safety)
    • 70. FIREPROOF (probabilistic framework for onboard fire safety)
    • Azzi, Camille and Vassalos, Dracos (2008), “Design for Fire Safety of RoPax
    Ships”, Interferry Conference, Hong Kong.
    • Azzi, Camille and Vassalos, Dracos (2009), “Design for Shipboard Fire Hazards
    Assessment”, 10th International Marine Design Conference, Trondheim,
    Volume 1: pp. 476-488.
  • 71. Evacuation simulation:Evi (Evacuability index) software
    Evaluation of evacuation time
    Identification of potential bottlenecks
    Evaluation of accommodations layout at the design stage to aid for easy evacuation.
    Building “what if” scenarios for:
    Training purposes
    Effective planning procedures
    Decision support strategies for crises situations
    Videos can be used to familiarise passengers with the ship environment (3D virtual environment that replicates the ship).
  • 72. Evacuation simulation:Evi (Evacuability index) software
    Simulations are achieved through variables that describe passengers profile (number, age, gender...) and distribution for the time of the day or night.
    Crew can be assigned particular tasks (search cabins, control spaces....)
    Some features:
    Playback recordings as video
    Interactions during the simulation: Blocking or unblocking of doors, assign a task to a specific crew member.
    Include fire data
    Include flooding data
    Could be coupled to a passenger tracking system (concluding preliminary tests in MarNIS project)
  • 73. Evacuation simulation:Evi (Evacuability index) software
    • Safecrafts : Safe abandoning of passenger ships.
    • 74. MarNIS: Maritime Navigation information services.
    • 75. Floodstand: Integrated Flooding Control and Standard for Stability and Crises Management.
    Evacuation Notation – a New Concept to Boost Passenger Evacuation Performance in the Cruise Industry, M. Dogliani, T. Strang, D. Vassalos and the Evacuation Group of the Ship Stability Research Centre (SSRC), Compit 04, Sigüenza, Spain, May 2004.
    Effectiveness of Passenger Evacuation Performance For Design, Operation & Training using First-Principles Simulation Tools, D. Vassalos, L. Guarin, M. Bole, J. Majumder, G. C. Vassalos and H.S. Kim, Escape, Evacuation & Recovery, Lloyds Lists Events, London, March 2004.
    Advanced Evacuation Analysis - Testing the Ground on Ships, D. Vassalos, L. Guarin, G. C. Vassalos, M. Bole, H.S. Kim and J. Majumder, Pedestrian and Evacuation Dynamics, August 2003, Greenwich. Evacuability of Passenger Ships at Sea, D. Vassalos, G. Christiansen, H.S. Kim, M. Bole and J. Majumder, SASMEX 2002.
    A Mesoscopic Model for Passenger Evacuation in a Virtual Ship-Sea Environment and Performance-Based Evaluation, D. Vassalos, H.S. Kim, G. Christiansen and J. Majumder, Pedestrian and Evacuation Dynamics, April 4-6, 2001, Duisburg.
    Passenger Evacuation in a Virtual Ship-Sea Environment and Performance-Based Evaluation, D. Vassalos , H.S. Kim, G. Christiansen, Cruise and Ferry, May 2001.
  • 76. Crashworthiness assessment
  • 77. Crashworthiness assessment
    Projects: N/A
    • (Mermiris & Vassalos, 2007a), “A Generic Approach to Breach Size Assessment Following a Ship-Ship Collision Event”, Mermiris, G. and Vassalos, D., The Asialink-EAMARNET International Conference on Ship Design, Production and Operation, Harbin, China, pp. 38-43, 17-18 January, 2007
    • 78. (Mermiris et al., 2007b), “First-Principles Collision Analysis for Design”, Mermiris, G., Vassalos, D. and Konovessis, D., 1st International Conference on Marine Structures (MARSTRUCT 2007), pp. 217-223, Glasgow, UK, 12-14 March, 2007
  • Side shell damage
    Bottom damage
    Residual strength assessment
  • 79. Residual strength assessment
    • Surfacing System for Ship Recovery (SuSy)
    Publications: N/A
  • 80. Databases in design & operation
    • Advanced Marine Accident/Incident Database Development
  • Databases in design & operation
    • Data Mining for risk model construction
    - Probabilistic Framework for Onboard Fire Safety (FREPROOF)
    Bayesian Network risk model
  • 81. Databases in design & operation
    - Probabilistic Framework for Onboard Fire Safety (FIREPROOF)
    - "Data Mining of Marine Accident/Incident Database for Use in Risk-based Ship Design", Vassalos, D., Cai, W. and Konovessis, D., 10th International Conference on Stability of Ships and Ocean Vehicles (STAB 2009), pp. 209 – 218, St. Petersburg, Russia, 22 - 26 June, 2009
  • 82. Energy efficiency of ships & ship systems
  • 83. Energy efficiency of ships & ship systems
    Projects: N/A
    Publications: N/A