CFD-DEM BED LOAD GRANULAR MATTER INSTABILITY BARCHAN-BARCHAN INTERACTIONS PARTICLE TRACKING SOLIDIFICATIONS OF SPHERES OBSTACLES TWO-PHASE FLOW CONCRETE NARROW BED LAND HETEROGENEITY OF FARMS BARCHAN DUNE BARCHAN FIELDS DEEP LEARNING CRYSTALLIZATION COMPUTATIONAL FLUID DYNAMICS STRAW FORCES ON GRAINS THEORY ABRASIVE EROSION CONVOLUTIONAL NEURAL NETWORK NUMERICAL SIMULATIONS BEAMLINE SGM FLUIDIZED BEDS