Increasingly computational methods are being used for industrial problems in place of expensive or very difficult physical experiments. Attention needs to be given to all aspects of the input into these complex flow problems such as the inlet conditions as these may have a significant effect on the subsequent solution. High aspect ratio cross-sectional orifice (HAR) jets is one such field as such jets occur in many industrial situations. These can include gas dispersion within an enclosed space, within machinery and manufacturing processes. These will often be part of a more complex problem and previous work [1] has shown that it is crucial to model these jets numerically in as accurate and consistent way as possible given the limitations of turbulence models and computing power. The aim of this paper is to extend previous work [1] and to further analyse initial numerical results from simulations of the flow described in the experimental work of Meares [2]. The work here undertakes to do an initial assessment of the effect turbulence modelling has on the internal flow within the pipe and through the flange and gap in the gasket. The standard two-equation k-ε and the variant RNG and realisable models will be used with a standard wall law. Future work will look at time dependent simulations and also the use of Large Eddy Simulation. The effect of the length of pipe modeled and pipe pressure are also explored, consistent with the experimental work done by Meares [2] on HAR orifice jets for one gasket shape.

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