by National Aeronautics and Space Administration, Langley Research Center, Institute for Computer Applications in Science and Engineering, For sale by the National Technical Information Service in Hampton, Va, [Springfield, Va .
Written in English
|Statement||Bassam A. Younis, Thomas B. Gatski, Charles G. Speziale.|
|Series||ICASE report -- no. 94-70., NASA contractor report -- 194964., NASA contractor report -- NASA CR-194964.|
|Contributions||Gatski, T. B., Speziale, C. G. 1948-, Institute for Computer Applications in Science and Engineering.|
|The Physical Object|
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. 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 by: 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. , On the Prediction of Free Turbulent Jets with Swirl Using a Quadratic Pressure-Strain Model, Institute for Computer Applications in Science and Engineering, NASA Contractor Report , Hampton,
The accurate prediction of turbulent swirling flows requires the use of a differential Reynolds-stress transport model to close the time-averaged Navier–Stokes equations. The performance of such model is largely determined by the way in which the fluctuating pressure–strain correlations are approximated. A number of alternative approximations are available, all of which depend explicitly. Coefficients in pressure-strain model. and Spalding, D. B., “A two-parameter model of turbulence and its application to free jets”, Wärme Stoffübertrag. 3, 85 () ADS CrossRef Google Scholar. Rodi, W., “The Prediction of Free Turbulent Boundary Layers by Use of a 2-Equation Turbulence Model. The inconsistency lies in the implementation of a production-equals-dissipation equilibrium hypothesis in conjunction with a freestream mean velocity field that corresponds to homogeneous plane strain—a turbulent flow for which the standard K–ε model does not predict such a simple equilibrium. The pressure–strain term, also called the pressure scrambling term, is responsible for the redistribution of turbulent energy amongst the six stress components. The linear pressure strain model was used by both packages to model the pressure–strain terms of .
W. Rodi, “The prediction of free turbulent boundary layers by use of a two-equation turbulence model,” Ph.D. thesis, University of London, Google Scholar; H. Iacovides and B. E. Launder, “The numerical simulation of flow and heat transfer in tubes in orthogonal-mode rotation,” in Ref. 11, Paper 15–1. Google Scholar; H. Use for highly swirling flows. Quadratic pressure-strain option improves performance for many basic shear flows. RANS Models Behavior Summary Model Behavior and Usage. Spalart – Economical for large meshes. Performs poorly for 3D flows, free shear flows, flows with strong separation. (). AssesslllC'nt of tht' SS(; pressure-strain model in free turbulent jets with and without swirl. (). Burning velocities. ~Iarkstcin lengths, and flame quenching for spherical methane-air flam('s:a computational study. (). Calculation methods for reacting t urbulent. flows - a review. (). RSM turbulence model (Quadratic pressure strain if you can get convergence with it although depending on gradients in the flow the linear pressure strain model should be fine) PRESTO pressure discretisation QUICK discretisation for momentum Either 2nd order/Quick for the rest. Also I would use a 2nd order scheme for the time step.