3d-Computation of Incompressible Internal Flows: Proceedings of the Gamm Workshop Held at Epfl, 13-15 September 1989, Lausanne, Switzerland

ISBN-13: 9783528076399 / Angielski / Miękka / 1993 / 231 str.

Gabriel Sottas; Inge L. Ryhming; Inge L. Ryhming

Opis

The aim of the 1989 GAMM Workshop on 3D-Computation of Incompressible Internal Flows was the simulation of a realistic incompressible flow field in an important industrial application. In view of the difficulties involved in formulating such a test case, requiring the availability of an experimental data base, extreme care had to be taken in the selection of the proper one. Professor I. L. Ryhming's proposal, that the flow through a Francis turbine configuration or parts thereof would be feasible as a test case, because of the numerical challenges as well as the possibility to produce an experimental data base by using the experimental facilities of the Hydraulic Machines and Fluid Mechanics Institute (IMHEF) at the Swiss Federal Institute of Technology in Lausanne (EPFL), was accepted by the GAMM Committee in April 1987. A scientific committee, formed under the chairmanship of Professor I. L. Ryhming, met a few times to decide on the Francis turbine configuration, the test case specifications, etc., whereby the design input came from the water turbine experts. This committee decided to restrict the studies to the three following typical applications for the best operating point of the turbine: simulation of the 3D flow in a Francis runner in rotation simulation of the 3D flow in the distributor (stay and guide vane rings) of this turbine simulation of the 3D flow in an elbow draft tube The simultaneous computation of two or three of these geometries was encouraged."

Spis treści

1. Test Cases Specifications.- 2. Experimental Results.- Experimental Flow Study of the GAMM Turbine Model.- Normalization of Flow Profile Data Measured at Runner Inlet.- 3. Numerical Flow Simulations.- A 3D Euler Solution of Francis Runner Using Pseudo-Compressibility.- Numerical Inviscid Flow Analysis of the GAMM Francis Runner.- Euler Simulations of Flow in a Francis Distributor and Runner.- Numerical Solution of the Incompressible Euler Equations in a Water Turbine Using a Multi-Block Approach.- A Stacking Technique for Multistage 3D Flow Computation in Hydraulic Turbomachinery.- 3D Euler Computation of the Flow inside the GAMM Francis Runner.- 3D N-S FEM Flow Analysis in Draft Tube.- Computation of 3D Flow Field in a Draft Tube.- 3D-Euler Flow Analysis of Runner and Draft Tube of the GAMM Turbine.- A Potential Prediction of Three-Dimensional Incompressible Flows through Turbomachinery Blade Rows.- 3D Flow Analysis in the Runner and the Distributor of Francis Turbines.- Calculation of the Draft Tube Geometry Using the Finite-Element-Code FENFLOSS.- Three-Dimensional Turbulent Flow Analysis for a Hydraulic Turbine Draft Tube by the Finite Element Method.- 3D Viscous Flow Analyses for the GAMM Workshop Draft Tube and Francis Runner.- 4. Synthesis.- Critical Evaluation and Comparison of Contributed Solutions.- List of Participants.