Masanori Yamakawa

Three-Dimensional Analysis Method for Sloshing Behavior of FBR and Its Application to Uni- and Multi-Vessel Type FBRs

Abstract A three-dimensional analysis method for sloshing behavior of FBR is developed. The method treats the coolant in a reactor vessel as a potential flow with moving liquid surfaces. The Laplace equation of velocity potential is solved by a boundary element method with its boundary conditions described by a Bernoulli equation. The method is applied to analysis of sloshing behavior of uni- and multi-vessel type FBRs and results are presented. The latter consists of vessels for the core, heat exchangers and pumps, all of which are connected by piping. In the uni-vessel type, heat exchangers and pumps are placed in the reactor vessel.

A Theoretical Study of Turbulent Energy Spectra in Stably Stratified Shear Flow.

Turbulent energy spectra in stably stratified shear flow were studied theoretically based on the turbulent spectral equation and the experimental results. A theoretical expression of the turbulent energy spectra was derived for the inertial subrange. According to this expression, the energy spectra of the stably stratified shear flow approached those of isothermal shear flow as the wave number increased, and the difference in energy spectra between stratified and isothermal flows was directly proportional to the -3rd power of the wave number. The one-dimensional energy spectrum obtained experimentally conformed to the expression.

SIMULATION FOR POLYMER MELT FLOW IN INJECTION MOLDING

To simulate the kinematic behavior of polymeric fluids which are utilized in injection molding, a numerical method using a finite element approach is proposed to analyze the unsteady three-dimensional flow of power-law fluids with moving free surfaces. The calculation results are obtained by the present method for two box-shaped cavity flows, which represent injection molding.

A numerical analysis for unsteady flow of high-viscosity non-Newtonian fluids with free surfaces.

A numerical method using a finite element approach has been developed to analyze unsteady flow of power-law fluids with free surfaces. In this paper, we propose a technique for calculation of a moving free surface; the method uses marker particles and volume of fraction, which is the occupancy rate of fluid in an element. The calculation result obtained by the present method for an L-shaped cavity flow was comparable with that obtained by the mesh rezoning method. It was within 5% difference in the calculation of location of the moving free surface. In the other examples, there are shown to calculation results of a moving free surface by the injection molding of two box-shaped cavity flows. Lastly, a calculation result for three-dimensional flow in a concave lens is shown.