Thank you for your response, Bob. The mesh appears to be fine, and I've verified the time step and under-relaxation factors, but nothing seems to work. When I turn off the model, it runs, but I still can't identify the issue. I've checked the model settings and the reaction modeling, but the problem persists. Another thing! I used the same settings to run the simulation on another computer, and it worked fine there. However, the simulation starts well sometimes, but the solid region becomes too fluidized and rises to the top of the reactor, which is unrealistic. What could be causing this issue with the simulation? How can it be corrected? What are the possible solutions to these issues?Â
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