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Improvements of particle image velocimetry applied to turbulence analysis influid mechanics


Research objectives and content
Digital Particle Image Velocimetry (D-PIV) is the digital counterpart of conventional Laser Speckle Velocimetry (LSV) and Particle Image Velocimetry techniques. In this novel two-dimensional non intrusive technique, digitally recorded video images are analysed computationally, removing slow and opto-mechanical processing steps. Depending on the procedures adopted to analyse the PIV images the performances of the whole technique can vary dramatically. The accessibility in terms of cost, to more powerful computers makes it possible to develop very accurate processing techniques that are leading the technique to the top of the advanced experimental, non-intrusive, tools for quantitative multidimensional measurements. It is worthwhile to remember that the more accurate are the results of a measurement, the deeper basic fluid dynamics phenomena like instability, turbulence and combustion can be understood. The major need for this improvement is represented by the fact that most of the flows of current interest in basic and applied research fall in the mentioned examples. The aim of the present co-operational project consists, mainly, in the development and improvement of innovative D-PIV procedures, making use of the powerful computational resources. The plan will be to apply 'intelligent algorithms' imported from the area of Computational Fluid Dynamics (CFD). The experimental results are expected to represent an important test bench for CFD itself, considering that the actual state of the art in such field does not allow jet to simulate correctly turbulent flows as well as turbulent combustion.
Training content (objective, benefit and expected impact)
The research program to be made at the von Karman Institute offers the possibility of utilising all the sophisticate instruments necessary to perform advanced D-PIV experiments, as the powerful double cavity pulsed YaG LASER, high resolution digital cameras and powerful computational resources (Alpha stations). The objective of the training is to reach a wide and highly specialised knowledge about the whole PIV experimental technique. The positive feed-back is expected on two sides: in terms of returned know how, it will allow to start and develop this extremely advanced technique at the University of Naples; in terms of absolute improvement it will constitute the opportunity for the von Karman Institute to maintain its role of guide in the field of experimental fluid dynamics.
Links with industry / industrial relevance (22)
As already mentioned, the development and improvement of this innovative technique allows to investigate most of the flows of industrial interest that a very few other techniques can deal with. The EA department at von Karman Institute actually has l several important ongoing industrial collaborations. Especially to solve typical problems of industrial processes driven by turbulent heat transfer (steel manufacturing, material technologies, etc.)


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