Type of issue
solver crash, solver non-convergence
Hello everyone, I built a very simple fluidized bed reactor to simulate coal (or sludge) combustion. Everything is okay in the initial phase of the simulation, but the solver crashed at 1.51s, and the error message is:
I’ve seen this “Unable to match particles crossing processor boundaries” before but was not able to get to the bottom of it.
It may be due to particles leaving the domain - velocities too high or wall stiffness too low.
It may depend on the number of nodes used. A previous case I investigated failed with 8 DMP nodes but succeeded with any other number. Experiment with the domain decomposition and see if that makes any difference.
In my case, this problem occurs if the restitution coefficient of the particle is set too small, such as 0.5. If the restitution coefficient is set to 0.9, the problem will disappear. It’s very confusing.