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We are developing a superconducting magnet system that can, on the ground, control gravitational force on protein crystal solutions through use of magnetic forces. Magnetic forces give rise to a variety of effects on motions of protein solutions. We proposed a dynamical model of fluid and material flow in solution under gravity and magnetic force in our previous works. The numerical calculation results showed that magnetic forces could suppress convections and lead to unexpected concentration distributions of solutes under some hypothetical conditions. In this paper, we present some simulation results under actual conditions in a superconducting magnet. The results show that inhomogeneity of magnetic force affects modifies concentration and convection distributions.