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Remembering Charles E. Till
Charles E. Till
Charles E. Till, an ANS member since 1963 and Fellow since 1987, passed away on March 22 at the age of 89. He earned bachelor’s and master’s degrees from the University of Saskatchewan and a Ph.D. in nuclear engineering from Imperial College, University of London. Till initially worked for the Civilian Atomic Power Department of the Canadian General Electric Company, where he was the physicist in charge of the startup of the first prototype CANDU reactor in Canada.
Till joined Argonne National Laboratory in 1963 in the Applied Physics Division, where he worked as an experimentalist in the Fast Critical Experiments program. He then moved to additional positions of increasing responsibility, becoming division director in 1973. Under his leadership, the Applied Physics Division established itself as one of the elite reactor physics organizations in the world. Both the experimental (critical experiments and nuclear data measurements) and nuclear analysis methods work were internationally recognized. Till led Argonne’s participation in the International Nuclear Fuel Cycle Evaluation (INFCE), and he was the lead U.S. delegate to INFCE Working Group 5, Fast Breeders.
I. Toumi, D. Caruge
Nuclear Science and Engineering | Volume 130 | Number 2 | October 1998 | Pages 213-225
Technical Paper | doi.org/10.13182/NSE98-A2001
Articles are hosted by Taylor and Francis Online.
A new numerical method for three-dimensional two-phase flow computations is presented. The method has been implemented within the FLICA-4 computer code, which is devoted to three-dimensional thermal-hydraulic analysis of nuclear reactor cores. This numerical method is based on a finite volume technique, where convective fluxes at cell interfaces are calculated with an approximate Riemann solver. A strategy for constructing this linearized Riemann solver, which extends Roe's scheme, to solve two-phase flow equations is described. Extension to a second-order-accurate method is achieved using a piecewise linear approximation of the solution and a slope limiter method. For advancing in time, a fully implicit integrating step is used. Some improvements performed to obtain a linearized implicit solution method that provides fast-running steady-state calculations are also presented. This kind of numerical method, which is widely used for fluid dynamic calculations, is proved to be very efficient for the numerical solution to two-phase flow problems.