Rock melting in a magma chamber

MeltingThe geometry of this three-phase problem is defined by the porous rock structure of solid magma. The pores are filled with liquid magma which interacts with the solid through melting/cristallisation. Hot gas bubbles raising inside this media through buoyancy are responsible for heat convection, leading ultimately to complete melting.

This problem puts into play a complex interaction of physical ingredients, including multi-phase flow, buoyancy effects, thermal convection, and changing geometry. Palabos has the unique ability to combine these ingredients while maintaining the computational strength and inherent parallelism required for representing the three-dimensional multi-scale porous structure.

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The following study investigates gas throughput and melting efficiency depending on the quantity for which a constant rate is maintained.

Melting - Different regimes

Context

Large volcanic eruptions are spectacular natural events, which display power outputs exceeded only by asteroid impacts. Despite their destructiveness, the risk perceived by modern-day societies is strongly under-evaluated due to the relatively long recurrence intervals between eruptions when compared to the typical human memory timescale; the last major eruption that had a global impact on climate and killed more than 90.000 people occurred in 1815 (Tambora, Sumbawa, Indonesia). Such eruptions occur on average every 150-200 years, and the next one will have devastating effects on human infrastructures and population. A better understanding of the physics of volcanic eruptions and more predictive capabilities are urgently needed to reduce damages in the future.

The goal of this research is to define several LB models in order to address challenging problems in geophysics and volcanic hazards. A key objective of this project is to simulate an idealized 2D magma chamber and study the condition which may lead to a volcanic eruption. Three steps are required for such an investigation: (1) devise a reliable model for the melting and crystallization of the magma flowing in a porous medium; (2) devise a model for hot bubbles rising through the magma chamber and exchanging heat with the surroundings; (3) provide criterias for magma chamber remobilization and eruption by comparing numerical results with a range of geologically reasonable gas and magma fluxes in volcanic provinces.

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