I was simulating 3D cylinder fluidised bed, but I am getting this error message. Can someone tell how to resolve this error?
dt is the timestep that the mfix tries to keep larger to finish simulation quicker. When not possible, dt is being reduced. In this case, simulation needs dt smaller than dt_min. As the message says,you need to lower your dt_min.
dt will range between dt_min and dt_max, both of which the user has control over.
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You are seeing that error is also because of big changes happening in one timestep. The other approach is to introduce the boundary condition slowly, so that transition of particle motion is smooth.