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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.
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