time step of twophaseeulerfoam
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@东岳 Thanks. My parameters are: Pipe diameter is 0.1 m, mean velocity is 2.5 m/s (ensure fully-suspended), particle size is 1e-4 m, density of particle is 2650 kg/m3, fluid is water. As you can see, the velocity is so small. I cannot imagine if that small time step is used, how much time I need to finish one simulation. There is no way to increase the time step. By the way, I already switch on adjustable time step option, which automatically adjusts the time step to be as large as possible.