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Two axial-symmetry solutions for incompressible flow through a centrifugal compressor with and without inducer vanes

Description: Report presenting solutions for axially symmetric flow through an impeller with and without inducer vanes, which were obtained by relaxation methods using an analysis in the report. The fluid was considered inviscid and incompressible. Plots of streamlines, lines of constant velocity, and lines of constant tangential blade force are presented and discussed.
Date: September 1951
Creator: Ellis, Gaylord O.; Stanitz, John D. & Sheldrake, Leonard J.
Partner: UNT Libraries Government Documents Department

A Simple and Efficient Diffuse Interface Method for Compressible Two-Phase Flows

Description: In nuclear reactor safety and optimization there are key issues that rely on in-depth understanding of basic two-phase flow phenomena with heat and mass transfer. For many reasons, to be discussed, there is growing interest in the application of two-phase flow models to provide diffuse, but nevertheless resolved, simulation of interfaces between two immiscible compressible fluids – diffuse interface method (DIM). Because of its ability to dynamically create interfaces and to solve interfaces separating pure media and mixtures for DNS-like (Direct Numerical Simulation) simulations of interfacial flows, we examine the construction of a simple, robust, fast, and accurate numerical formulation for the 5-equation Kapila et al. [1] reduced two-phase model. Though apparently simple, the Kapila et al. model contains a volume fraction differential transport equation containing a nonlinear, non-conservative term which poses serious computational challenges. To circumvent the difficulties encountered with the single velocity and single pressure Kapila et al. [1] multiphase flow model, a 6-equation relaxation hyperbolic model is built to solve interface problems with compressible fluids. In this approach, pressure non-equilibrium is first restored, followed by a relaxation to an asymptotic solution which is convergent to the solutions of the Kapila et al. reduced model. The apparent complexity introduced with this extended hyperbolic model actually leads to considerable simplifications regarding numerical resolution, and the various ingredients used by this method are general enough to consider future extensions to problems involving complex physics.
Date: May 1, 2009
Creator: Berry, Ray A.; Saurel, Richard & Petitpas, Fabien
Partner: UNT Libraries Government Documents Department