Artificial intelligence (AI) can predict an output from unknown input data by pre-learning the relationship between two known datasets. Deep learning is a type of machine learning approach and is J Prosthodont Res. 2022; **(**):

Density current in a rectangular settling tank is investigated mathematically. The basic equation consists of equation of motion for horizontal and vertical direction together with the mass conservation equation of both fluid and sediment.As a turbulence model, the standard k-€ model is employed. Flow velocity profiles and sediment concentration distribution are illustrated. When the temperature of inlet suspension is warmer than that of the tank water, the suspension flows downward with the positive buoyancy. This density current increases the turbulence in its accelerating stage, which prevents the settling of sediments. On the other hand, in the case of high sediment concentration, the turbidity current accelerates rather low region in a tank, which may bring the resuspension of bottom sediment. It is also shown that the flow field is very complicated one, because the density current brings up under the developing stage of bottom boundary layer. If the sediment particle has higher fall velocity, they settle down within a short distance. In such case, the density current gives its effect on the sediment motion only in the developing stage and this effect leads to the decrease of removal ratio.

Effect of inlet structure on flow in rectangular settling tank.

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