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This report details the work undertaken by the International Gas Union (IGU) Study Group 3.4 during the triennium 2003–2006. The initiative that launched this work came during the 22nd World Gas Conference where it was noticed that use of pipeline incident information often is not fit for purpose. A comparative analysis has been carried out considering the most frequently used and reliable high pressure gas pipeline incident databases. The four main objectives of the analysis were to determine the differences and similarities of existing databases, create a reference model to be used when developing a new pipeline incident database, assess if harmonization of existing databases is possible and to provide recommendations regarding the above.

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The turbulent flow around a delta wing at incidence is simulated numerically using a finite-volume Navier-Stokes method. The numerical simulation makes use of a simple algebraic turbulence model. The influence of grid refinement is investigated. The more realistic wing-body configuration with round leading edge is used to discuss the influence of the position of the transition line and to compare experimental and numerical data to validate the numerical method. The topological structure of the flow is discussed. An explanation is given for the low particle density area close to the primary vortex as it is visualised by laser light-sheet technique in the experiment. Results for a close coupled delta-wing-canard configuration are discussed.