DEVELOPMENT OF COMPUTATIONAL TECHNIQUES FOR NUCLEAR-ENGINEERING

Computational techniques for various purposes in the nuclear engineeri ng have been developed in the Nuclear Engineering Research Laboratory, the University of Tokyo. Qualitative Constraint-based Explanation (QC E) technique was proposed for simulating engineering sense with a comp uter. For Quantitative Visualization, Velocity Vector Histogram (VVH) method and Spring Model technique were developed in the Particle Image Velocimetry (PIV), by which three-dimensional velocity distributions are efficiently measured. Measurement of three-dimensional density dis tribution using the Genetic Algorithm (GA) was studied as well. In the field of the Computational Fluid Dynamics (CFD), a Boundary-fitted Co ordinate (BFC) method was developed for incompressible flows in comple x geometry. Numerical analysis of heat transfer to supercritical water was carried out and mechanisms of the heat transfer deterioration wer e clarified. Moving Particle Semiimplicit (MPS) method is a new numeri cal method based on particles and their interactions. This method is e xpected to be applied to various combined problems of the nuclear engi neering. These computational techniques presented in this paper are up -to-date technologies using computers. (C) 1997 Elsevier Science Ltd.