Reply To: How to set the degrees of freedom of the particle in HLBM
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due to the given output I assume that the lattice velocity () becomes too large. Try a smaller velocity (1/10 or even less just for testing). If the simulation is stable with the smaller velocity, then you probably need to change your discretization (Δt and Δx) in order to make the simulation work with the original velocity.
Also, do you still apply the gravitational force (it’s called external acceleration in the example)? This could cause an erroneous particle velocity.