Abstract：Supergravity can significantly increase the gravity difference between solid-liquid phases, and the removal rate of inclusions in molten metal can be greatly accelerated. The study was based on the supergravity metallurgy device to establish computational fluid dynamics model of solid inclusions in the liquid steel in different gravity fields, according to the dynamic mesh and flow-solid interaction. The model simulated the floating motion state of inclusions in the gravity fields with different gravity coefficients, and studied the influence of factors such as the supergravity coefficient and size of inclusions on the floating behavior and flow field distribution. The simulation results indicate that the inclusions tend to be steady movement after a short acceleration with the constant gravity coefficient, the extension of supergravity field will cause the increase of floating speed of inclusions and the liquid steel near the inclusions will be “push away” quickly, then the flow state of liquid steel has been changed. Inclusion particles with d=1, 10 μm are still satisfied with the Stokes flow law under the certain supergravity field since the size of particle is small. The large size inclusions of d=100 μm only compliant with the Stoke flow Law when the gravity coefficient is below ten times. With the lager gravity field is applied, the nearby flow field changes from laminar flow to turbulent flow, and the Stokes float law is no longer suited. When studying the model of inclusion floats in gravity fields with different gravity coefficients, it is found that the change of floating velocity for d=1 μm inclusions is directly proportional to the change of gravity coefficient when the coefficient changes with time. After the lager inclusions such as d=10, 100 μm are not consistent with the laminar flow field, the floating velocity is no longer in a linear relationship with the gravity field.
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