On the prediction of free turbulent jets with swirl using a quadratic pressure-strain model

Younis, Bassam A.; Gatski, Thomas B.; Speziale, Charles G.

Data from free turbulent jets both with and without swirl are used to assess the performance of the pressure-strain model of Speziale, Sarkar and Gatski which is quadratic in the Reynolds stresses. Comparative predictions are also obtained with the two versions of the Launder, Reece and Rodi model which are linear in the same terms. All models are used as part of a complete second-order closure based on the solution of differential transport equations for each non-zero component of the Reynolds stress tensor together with an equation for the scalar energy dissipation rate. For non-swirling jets, the quadratic model underestimates the measured spreading rate of the plane jet but yields a better prediction for the axisymmetric case without resolving the plane jet/round jet anomaly. For the swirling axisymmetric jet, the same model accurately reproduces the effects of swirl on both the mean flow and the turbulence structure in sharp contrast with the linear models which yield results that are in serious error. The reasons for these differences are discussed.

Document ID

19950009656

Acquisition Source

Legacy CDMS

Document Type

Preprint (Draft being sent to journal)

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Date Acquired

September 6, 2013

Publication Date

August 1, 1994

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Publisher: NASA

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Report/Patent Number

Accession Number

95N16071

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Public

Work of the US Gov. Public Use Permitted.

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