MIcro to macro-scale MOdeling for SAfe Hydrogen combustion in fluidized beds – MIMOSAH

A very detailed characterization of the reactive flow is performed by direct numerical simulations of fully resolved particles with the code RESPECT. Data obtained at the microscopic scale are used to develop closures for the N-Euler approach to implement in the code NEPTUNE_CFD. The results obtained from the numerical simulations are compared with the experiments to assess the physical-mathematical modeling.

Mathematical modeling of reactive multi-species two-phase flow in the frame of the 1-fluid approach using the penalty method.

Direct numerical simulation of hydrogen combustion in dense particle regime. Characterization of hydrogen combustion in fluidized beds by experiments. Unsteady 3D simulations of the reactor at laboratory scale.

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This project aims at characterizing the hydrogen combustion in fluidized beds, for the production of thermal energy using mean thermal power devices. A multi-scale approach, from micro to macro scale, will be used. A very fine characterization of the reactive flow will be carried out by the fully-resolved particle direct numerical simulation (FRP-DNS). The latter will be first conducted in a fixed-bed configuration in order to validate the reduced reaction schemes, developed within the project, against fixed-bed experimental measurements. Next, FRP-DNS will be performed in a fluidized regime, to study the hydrogen combustion in fluidized beds, at microscopic scale. From micro-scale numerical results, closures laws to use in a macro-scale approach will be developed. The new models will be implemented in a N-Euler code and numerical simulations of fluidized beds performed and compared with fluidized-bed experiments.