Abstract
Diffuser flow is characterized by locally attached separation bubble which is also common in compressor cascade flow. To predict the separation region accurately with RANS solvers, turbulence enclosure models are critical to the CFD ability to capture adequately the separation. In general two-equation models are regarded as practical choice and developed for diffusion flow, such as k - ɛ, k - ω, shear stress transportation (SST), as well as v 2 - f. In this paper, five common turbulence models were selected to predict the attached separation flow in an experiment-studied planar diffuser with the software FLUENT. k - ɛ model failed to predict the attached separation. S-A model, Wilcox’s k - ω model, SST k - ω model and ω 2 - f model predicted the separation bubble near the inclined wall and the S-A model’s reattached length is longest while the ω 2 - f model is smallest. The k - ω model presented the same capability with SST model in capturing the separation bubble along the inclined wall of the diffuser but smaller gradient of velocity near wall in the outlet part.
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© 2009 Tsinghua University Press, Beijing and Springer-Verlag GmbH Berlin Heidelberg
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Chen, L., Yang, A., Dai, R., Chen, K. (2009). Comparative Study of Turbulence Models in Separated-Attached Diffuser Flow. In: Xu, J., Wu, Y., Zhang, Y., Zhang, J. (eds) Fluid Machinery and Fluid Mechanics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-89749-1_30
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DOI: https://doi.org/10.1007/978-3-540-89749-1_30
Publisher Name: Springer, Berlin, Heidelberg
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