SMOOTHED PARTICLE SIMULATIONS OF THE PYROCLASTIC FLOW

Author:

NAGASAWA MIKIO1,KUWAHARA KUNIO2

Affiliation:

1. Institute of Computational Fluid Dynamics, 1–22–3 Haramachi, Meguro, Tokyo 152, Japan

2. Institute of Space and Astronautical Science, 3–1–1 Yoshinodai, Sagamihara 229, Japan

Abstract

We apply the Smoothed Particle Hydrodynamics (SPH) to the three-dimensional simulation of pyroclastic flow over the terrain in Unzen area. The actual flow was observed in June 1991. The comparison of the simulation with the observation tells us the proper parameter sets for this kind of particle simulation. The gas particle and the lava particle are approximated by the polytropic gas which has a hard adiabatic index, that is, the weak compressibility. Theoretical modeling of eruption, movement and emplacement of lava are in success. The covered area by the pyroclastic flow can be estimated in this simulation with a given volume of initial lava dome. Cohesion force modeled by two-point potential could be the source of surface tension, which halts the flow due to the bunching of fragments. Porous pressure and auto-suspension of transported sediment are reproduced by introducing the buoyancy of gaseous components in the flow.

Publisher

World Scientific Pub Co Pte Lt

Subject

Condensed Matter Physics,Statistical and Nonlinear Physics

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