Professor Emeritus Ove T. Gudmestad
University of Stavanger, Norway

Academic Profile: http://www.uis.no/article.php?articleID=73778&categoryID=11198

Keynote Lecture

Title: Limitations Related to Marine Operations in the Barents Sea
Abstract: Marine operations in the Barents Sea are operations carried out by the oil and gas industry, fishing activities for cods and crabs and other kinds of fish are ongoing, commercial transport as well as personnel transport take place, including cruise traffic. Some activities are normally ongoing year round; others are dependent on limited weather windows. The limitations for the marine operations are the special weather conditions characterized by unpredictable Polar Low situations during the fall, winter and spring seasons, cold temperatures that also are causing sea spray icing and the potential for drifting ice in certain parts of the Sea. The Polar Lows limit the predictability of suitable weather windows, necessitating planning for emergency disconnection of marine operations. The cold temperatures give rise to needs for winterization of vessels and equipment. The icing limits the possibility for operability of equipment and raises concerns as to stability of certain kinds of vessels. Furthermore, possible drifting ice represents a danger to any operations and needs to be monitored carefully. It must also be realized that large distances combined with challenging meteorological and oceanographic criteria represents a concern for evacuation and rescue, should it be necessary to abandon ships and platforms. The long distances to the locations farthest away from shore are also out of reach of helicopter assistance. All aspects listed above make it necessary to conduct hazard identification studies and to include all relevant historical knowledge in the sea “hazids”, prior to execution of marine operations in the Barents Sea.  

Keynote Lecture

Title: Integrity Management of Marine Structures 
Abstract: A brief overview of integrity management of offshore structures used for  production of oil and gas, ocean renewable energy and other functions,  is given. In general, acceptable structural performance is achieved by fulfilling serviceability and safety requirements in a broad sense. Structural safety means absence of  ultimate failure under extreme environmental and accidental events, as well as failure due to structural degradation.  Numerical models of loads, load effects, resistance form the basis for design as well as the life cycle follow up. The initial data about geometry, material properties, loads and predicted behaviour are supplemented by data from the fabrication process and operation; and imply “big data”. During operation a digital twin of the physical structure is used in the decision making. Predicted behaviour is subjected to  uncertainties relating to normal variability or human errors that occur in the life cycle. Hence,   structural integrity management takes place under uncertainty. An important issue is how normal uncertainties and human errors are dealt with by ensuring  competent personnel, adequate safety margins to cover normal uncertainties in design, adequate numerical methods, verification  and validation of numerical methods, including measures of their inherent uncertainty, inspection, monitoring and repair after fabrication and during operation.  On this basis, this paper focuses on the how numerical models should be used in the life cycle management of offshore structures to achieve serviceability and primarily safety.

Academic Profile: Demosthenes Polyzos is Professor of the Department of Mechanical Engineering & Aeronautics, Division of Applied Mechanics and Biomechanics of the University of Patras in Greece. His research activities include wave propagation phenomena in materials and structures, computational mechanics, Boundary Element Method, Meshless Methods, modeling in non--destructive testing, homogenization techniques, mechanics of materials and biomaterials with microstructural effects and computational methods in engineering and bioengineering. He is organizer of many National and International Conferences and  Principal Investigator in many National and EU projects. His contribution includes 85 articles in International Refereed Journals, 21 articles in books and 110 articles in proceedings of International and National Conferences. He is recipient of P.S. Theocharis award by the Academy of Athens and S.N. Atluri medal in recognition of his “outstanding contributions to boundary element methods in general”. He is Distinguished Fellow of the International Conference in Computational and Experimental Sciences and invited speaker in many Universities, Conferences and Institutes. Currently is Vice Rector of Research and Development of the University of Patras and President of the Special Account of Research Funds and responsible for the Unit of Research, Innovation & Entrepreneurship of the University of Patras.  

Keynote Lecture
D. Rodopoulos, S.V. Tsinopoulos, D. Polyzos

Title: Boundary Element Method (BEM) solution for large scale cathodic protection problems
Abstract: Cathodic protection techniques are frequently used for avoiding corrosion sequences in offshore structures. The Boundary Element Method (BEM) is an ideal method for solving such problems because requires only the meshing of the boundary and not the whole body of the structures as the FEM does. This advantage becomes more pronounced in cathodic protection systems since electrochemical reactions occur mainly on the surface of the metallic structure. The present work aims to solve numerically a cathodic protection problem for a large offshore platform. The solution of that large scale problem is accomplished by means of “PITHIA Software” a BEM package enhanced by Hierarchical Matrices (HM) and Adaptive Cross Approximation (ACA) techniques that accelerate drastically the computations and reduce memory requirements. The potential and the current density at all the surface of the platform are effectively evaluated, while the accuracy of the utilized BEM software is assessed through numerical and experimental benchmark problems taken by the literature.

Keywords: Cathodic protection, Offshore structures, Boundary Element Method, Hierarchical Matrices, Adaptive Cross Approximation, Large Scale  Problems.

Academic Profile: Numerical simulation methods (FVM and FEM), specifically Computational Fluid Dynamics Co-author of FOAM/OpenFOAM, open-source C++ computational continuum mechanics library Object-oriented design, expert C++ programmer, Unix/Linux, high-performance computing Adaptive error control, dynamic mesh handling; multi-phase and free-surface flows, turbulence modelling and LES numerics, non-linear solid mechanics and fluid-structure interaction Numerical simulations in naval hydrodynamics: free surface CFD Lecturing and post-graduate student supervision, OpenFOAM training and consultancy

 See also: http://titan.fsb.hr/~hjasak/

Keynote Lecture

Title: CFD Analysis in Subsea and Marine Technology  
Abstract: Accurate evaluation of design conditions for engineering equipment in a sub-sea and off-shore environment brings numerous challenges.  The loads originate from transient, stochastic and highly non-linear free surface flow, (eg. wave impact). Structural response is sought for objects undergoing 6-degrees-of-freedom (6-DOF) motion and deformation.

Experimental evaluation of loads is just as challenging, due to scaling effects and effort of reproducing realistic sea state in a controlled environment. Imprecise evaluation of structural loads may lead either to unnecessary increase in cost or succeptability to catastrophic failure.

Computational Fluid Dynamics offers a promise of accurate and predictive evaluation of loads, combining free surface flow model, 6-DOF motion and Fluid-Solid coupling.  In this talk, we shall present state of the art of CFD in modelling of regular, irregular and freak waves and its interaction with static and floating structures under mooring or propulsion using OpenFOAM and the Naval Hydro Pack. The work aims to address the challenges of irregular sea state modelling, wave impact and fluid-solid coupling in different frameworks, with examples of simulations and road-map of future challenges.  

Academic Profile: Trond Kvamsdal is Professor in Computational Mathematics at Department of Mathematical Sciences, NTNU, Trondheim, Norway.  Professor Kvamsdal is developing new theories/methods within Applied Mathematics and Numerical Analysis to obtain robust and efficient numerical software programs for challenging applications in science and technology. Main area of application is Computational Mechanics, i.e. both Solid/Structural and Fluid Mechanics relevant for Civil, Mechanical, Marine, and Petroleum Engineering as well as Biomechanics, Geophysics and Renewable Energy.

  See also: http://www.ntnu.edu/employees/trond.kvamsdal

Keynote Lecture

Title: Isogeometric Methods for Offshore Applications
Abstract: The isogeometric analysis approach developed by Hughes et al. originally presented in 2005 is based on B-Splines and NURBS (Non-Uniform Rational B-Splines), a standard technology employed in CAD systems. They propose to match the exact CAD geometry by NURBS surfaces, and then construct a coarse mesh of spline elements. The term "isogeometry" originates from combining the concept of  isotropic mapping in the finite element method with spline basis functions as common in computational geometry.

 A framework for performing isogeometric linear and non-linear finite element analysis with Splines and NURBS as basis functions was developed through the ICADA (Integrated Computer-Aided Design and Analysis) project managed by SINTEF and in collaboration with NTNU Dept. of Mathematical Sciences and Dept. of Structural Engineering.

 We will present results obtained within the ICADA project as well as from some of the following up projects. Key word here is adaptive isogeometric methods for 2D plane stress/strain elements, 3D volume elements as well as thin plate elements.

Academic Profile: Dr. Johan Ölvander is Professor in Machine Design at Linköping University in Sweden. Professor Ölvander presented his dissertation in 2001 entitled Multi-objective optimization in engineering design, and he has since then been an active researcher within the broad field of applied CAE (Computer-aided Engineering), in particular simulation based optimization. His research is conducted in close collaboration with industry. Dr. Ölvander is the author of more than 100 publications and he has supervised 8 PhD students. See also: https://www.iei.liu.se/machine/johan-olvander?l=en .

Keynote Lecture

Title: Challenges and Possibilities of Industrial Multi-Disciplinary Optimization in the Era of Digitalization

Abstract:  From an academic perspective, Multi-Disciplinary Optimization has been around for decades, but it has not yet had a great impact on industry. With the rapid development in the era of digitalization this is about to change dramatically. This presentation highlights recent advancements in the area of MDO and what impact they would have on industry in the years to come.  

Olivier Flamand, Researcher
Centre scientifique et technique du bâtiment (CSTB), Nantes, France.

Academic Profile: Olivier Flamand is Head of  Research and Expertise Pole in Climatology, Aerodynamics, Pollution and Purification, at the Scientific and Technical Centre for Buildings (Centre scientifique et technique du bâtiment, CSTB) in Nantes. At this French national institute, he has several decades of experience leading the wind tunnel, full-scale and numerical studies into wind effects on slender structures. His project work and research focus strongly on long-span bridges and the vibration of suspension and stay cables. The project references include: Normandy Bridge (1995), Millau Viaduct (1991-2004), Rion-Antirion Bridge(2000-2004), Russky Island Bridge(2010-2012), 3rd Bosphorus crossing (2011-2014). Olivier is secretary of the French wind engineering association, AIV , a member of the French civil engineering body AFGC and the research body LiRGeC.

See also: https://www.researchgate.net/profile/Olivier_Flamand

 Keynote Lecture

 Title: Challenges in wind tunnel modelling of wind engineering problems

 Abstract: Wind engineering is commonly associated with the wind tunnel experiments at a reduced scale. This introduces several limitations and calls for a careful planning of the tests and the interpretation of the experimental results. The talk will first revisit the similitude laws and discuss how they are actually applied in wind tunnel tests. It will also remind the listeners why different scaling laws are governing in different wind engineering problems. In a second part, the lecture will focus on the ways to simplify a detailed structure (bridge, building, platform) when fabricating the downscaled models for the tests. This will be illustrated with several examples from the recent engineering projects. Regarding the simulation of the extreme climate to study the resistance of manmade structures, some climatic wind tunnel experiments will be briefly presented.

Academic profile: http://www.uis.no/article.php?articleID=74028&categoryID=11198

Keynote Lecture

Title: Multi-fluid CFD Analysis in Process Engineering

Abstract: An overview of modeling and simulation of flow processes in gas/particle and gas/liquid systems are presented.  Particular emphasis is given to computational fluid dynamics (CFD) models that use the multi-dimensional multi-fluid techniques. Turbulence modeling strategies for gas/particle flows based on the kinetic theory for granular flows are given. Sub models for the interfacial transfer processes and chemical kinetics modeling are presented.. Examples are shown for some gas/particle systems including flow and chemical reaction in risers as well as gas/liquid systems including bubble columns and stirred tanks.