FLUID-PARTICLE INTERACTIONS INSTABILITY FLUIDIZED BEDS GRANULAR MEDIA BED-LOAD BARCHAN DUNE GRANULAR MATTER EXPERIMENTS PARTICLE TRACKING BED LOAD NARROW BED RESOLVED SIMULATIONS HYDRAULIC CONVEYING NUMERICAL SIMULATIONS BARCHAN FIELDS BARCHAN-BARCHAN INTERACTIONS SEGREGATION BED HARDENING CREEP SEASONAL WINDS OSCILLATING FLOW DUNES OBSTACLES DEEP LEARNING CONVOLUTIONAL NEURAL NETWORK FORCES ON GRAINS GRAIN SCALE CRYSTALLIZATION GAS-SOLID LEITO FLUIDIZADO SIMULAÇÃO NUMÉRICA MEIOS GRANULARES MATERIAL GRANULAR ONDAS DE DENSIDADE ESCOAMENTO GRAVITACIONAL PATTERN FORMATION