Approaching a practice for transient CFD simulations of vortex flow meters

Abstract: The usage of Large-Eddy Simulations (LES) in industrial applications makes it possibleto study transient phenomena. The aim of this work is to find a reliable and accurateapproach to transient studies of the internal flow field in a vortex flow meter. An initialinvestigation is made, based on simulation results from a cylinder in cross-flow, whichis comparable to a vortex generating rod in a vortex flow meter. The dependency ofturbulence models, spatial resolution and wall functions are investigated. Next,a fully synthetic boundary condition is developed to enable efficient and realistic inletboundary conditions for applications where cyclic boundary conditions are not applicable,e.g. for vortex flow meters. Finally, the outcome from the initial study on the cylinderin cross-flow, and findings during the work with the inlet boundary condition, serves asa base for decision making when a vortex flow meter model is investigated. The resultsfrom a LES simulation and two Laser Doppler Velocimetry (LDV) measurements on avortex flow meter model are compared. The results are evaluated in terms of centrelinestreamwise mean velocity, variance and vortex shedding frequencies.

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