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Explosions and fluid dynamics
DTU Building 421, room 002
Wednesday 5. April 2017,  12.00 - 16.20

DANSIS invites you to a seminar that will be on the fluid mechanics of explosions in different applications. Major explosions accidents are presented. Presentations will describe modelling and experimental investigation of explosions. They will also address risk management of major accident hazards. The program will be updated soon.


11.30 Registration
12.00 Welcome
Kenny Krogh Nielsen, Lloyd's Register
12.10 Explosions and detonations - concepts and basic principles 
Peter Glarborg, DTU Chemical Engineering
Premixed combustion of a flammable fuel-air mixture may result in a deflagration (flame), a detonation, or an explosion, depending on the physical conditions. For most practical applications, detonations and explosions are undesired and it is important to understand what may lead to these phenomena. In this presentation, the characteristics of these phenomena are outlined. Selected examples from industry are discussed.
12.40 Break with sandwiches
13.10 Explosion mechanisms and the Development of risk assessment approaches - experiments, accidents, 3D-modelling of explosions and risk
Olav R. Hansen, Lloyd's Register
The development of explosion phenomena knowledge over the past few decades is described through important large scale experiments, major accidents and the development focus of 3D explosion modelling in risk assessment studies. Different steps of a state-of-the-art explosion risk assessment are shown, the importance of proper modelling is discussed. The more exact and detailed the physics is modelled, the better is the potential for optimizing layout, design and safety measures.
13.55 Coherent explosion modeling in KFX™-EXSIM based on the Eddy Dissipation Concept
Kjell Erik Rian, ComputIT
Explosions and fires represent the most serious accidents in the oil and gas industry. To prevent or mitigate explosion and fire related accidents, the industry needs advanced predictive technologies to pre-design the safety measures. Here, the background and development of the industrial CFD tool KFX™-EXSIM for 3D gas explosion analyses in complex geometries is presented. The KFX™ simulation technology uses the same combustion physics modeling concept to model both gas explosions and fires. Furthermore, it is coupled to advanced models for non-linear dynamic structural response analysis and integrated with risk models for consistent, time-dependent risk management and barrier control (named KFX™-RBM). Examples from large-scale validation and industry application are included.
14.40 Coffee break 
15.10 FLACS Risk - next generation of 3D Risk analysis for Explosion, Dispersion and Fire
Franz Zdravistch, Gexcon
15.45 Enhanced gas explosion risk management through improved ignition control of gas turbine air intakes – with a particular focus on fluid mechanics
Ingar Fossan, ComputIT, and Kenny Krogh Nielsen, Lloyd's Register
Currently, the industry does not have a fundamental understanding of the behavior of gas turbines when intake air includes flammable gas. Two incidents has taken place in the North Sea after year 2000 where it is believed that the gas turbine air intake was the source of ignition, one of which occurred at the Danish Continental Shelf. As of today this problem appears to be the most important single source of ignition on many offshore installations. An ongoing Joint Industry Project investigates the ignition mechanisms and exploring ways to mitigate the risk. In this presentation the background problem is presented based on an actual accident investigation. The fluid mechanics aspects of gas dispersion and explosion modelling are represented. The ignition and propagation mechanisms within the gas turbine are governed by fluid mechanics. These are addressed together with potential mitigating measures.
16.15 Closing, future DANSIS activities 
Knud Erik Meyer, DANSIS chairman
16:20 End
16:30 DANSIS general assembly

Members of DANSIS can participate in the seminar free of charge. Non-members are also invited to participate at a fee of 400 DKK.

Register for the meeting
DANSIS - The Danish Society for Industrial Fluid Dynamics     Email: dansis@dansis.dk