Showing papers by "Kozo Fujii published in 1995"
TL;DR: VPA was confirmed to be an orally active and long-term acting insulin-mimetic vanadyl complex to treat insulin-dependent diabetes mellitus (IDDM) in rats.
195 citations
TL;DR: In this paper, a new zonal method is proposed to solve complex body configurations and increasing the accuracy of simulations. But the method is an extension of the FSA (fortified solution algorithm for generality, originally called FNS, fortified Navier-Stokes) zonal algorithm that the present author proposed in the past to improve the local accuracy of the flow field to be simulated.
113 citations
TL;DR: In this article, the effects of the spike length, Mach number, and angle of attack on the supersonic flow were examined using three-dimensional thin-layer compressible Navier-Stokes equations.
Abstract: In supersonic flow, a spike attached to the nose reduces the drag of a blunt body. In this paper, supersonic flows around a spiked blunt body are numerically simulated to examine the effects of the spike length, Mach number, and angle of attack. Three-dimensional thin-layer compressible Navier-Stokes equations are solved using a highresolution upwind scheme with LU-ADI time-integration algorithm. The computed results show that the drag of the spiked blunt body is significantly influenced by the spike length, Mach number, and angle of attack. Scales of the separated region are not significantly influenced by the freestream Mach number. For the spiked blunt body at angle of attack, the flowfield becomes complex with spiral flows. The computed results are in reasonable agreement with experimental data.
101 citations
TL;DR: In this paper, a 3D flow field induced by two trains passing by each other inside a tunnel is studied based on the numerical simulation of the three-dimensional compressible Euler/Navier-Stokes equations formulated in the finite difference approximation.
61 citations
TL;DR: In this article, the authors used a simplified two-step chemical reaction model consisting of the induction and the exothermic reactions to reproduce the large-disturbance regime of a spherical projectile in supersonic flows.
Abstract: Unsteady combustion around a spherical projectile in supersonic flows is numerically studied using the simplified two-step chemical reaction model consisting of the induction and the exothermic reactions. A series of simulations indicates that the intensity of the concentration of the heat release is a key parameter to determine the regime of the unsteady flowfield. Flow features of the unsteady combustion with low-frequency and high-amplitude oscillation, which is called the large-disturbance regime, are reproduced when the concentration of the heat release of the chemical reaction is high. Mechanism of the large-disturbance regime is clarified based on the histories of the density and pressure profiles on the stagnation streamline and the flowfield in front of the projectile body. The period and amplitude of the oscillation corresponding to the shock pressure behind the how shock agree with experimental observations, and the reproduction of the large-disturbance regime in the present simulation is confirmed.
28 citations
01 Jan 1995
25 citations
01 Jan 1995
11 citations
01 Jan 1995
9 citations
TL;DR: In this paper, the wavefront of a compression wave generated by a train moving into a tunnel is studied, where the flow around the train is considered to be a stream tube.
Abstract: In this work, the wavefront of a compression wave generated by a train moving into a tunnel is studied. A new one-dimensional flow model in which the flow around the train is considered to be a stream tube is proposed to determine the key parameters that affect the wavefront of the compression wave. From the result, the wavefront is found to be proportional to the lateral velocity at the height of the tunnel wall in steady flow around the train before the train enters the tunnel. This relationship between the wavefront and the velocity of the steady flow is validated from the experimental data. The result indicates that the wavefront of the compression wave can be predicted by investigating the steady flow field around the train in stead of the unsteady flow when the train moves into a tunnel.
7 citations
01 Jan 1995
6 citations
01 Jan 1995
TL;DR: In this article, the authors used a simplified two-step chemical reaction model consisting of the induction and the exothermic reactions to reproduce the large-disturbance regime of a spherical projectile in supersonic flows.
Abstract: Unsteady combustion around a spherical projectile in supersonic flows is numerically studied using the simplified two-step chemical reaction model consisting of the induction and the exothermic reactions. A series of simulations indicates that the intensity of the concentration of the heat release is a key parameter to determine the regime of the unsteady flowfield. Flow features of the unsteady combustion with low-frequency and high-amplitude oscillation, which is called the large-disturbance regime, are reproduced when the concentration of the heat release of the chemical reaction is high. Mechanism of the large-disturbance regime is clarified based on the histories of the density and pressure profiles on the stagnation streamline and the flowfield in front of the projectile body. The period and amplitude of the oscillation corresponding to the shock pressure behind the bow shock agree with experimental observations, and the reproduction of the large-disturbance regime in the present simulation is confirmed.