Speaker
Maria Vasilyeva
Description
We present a dynamic local–global coupling strategy for non-isothermal multiphase reactive flow in hydrate-bearing sediments, where hydrate phase change strongly couples transport, pressure, and temperature through variations in porosity and permeability. The nonlinear system is solved by sequential Picard iterations with physics-based splitting into transport, flow, and heat processes. To reduce the cost of global iterations, we introduce dynamic nonlinearity localization. Reaction-based markers identify active subdomains, which are enlarged by oversampling (buffer cells). A locally accelerated nonlinear solve is performed in these regions before a global correction step.