Running 2 components in a single time dependent study

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I have two components that are coupled in a time-dependent study, but the model is not converging. So, I conducted a test. I simulated each component separately in different studies, and both converged. Then, I simulated both components together in a single time-dependent study without coupling, but it still did not converge. My question is: Why it is not converging without coupling in a single time dependent study? The next step is simulating it with the coupling but I need to make sure that it is converging in single study time dependent firstly without coupling.

The variables converge quickly when I simulate the components separately. The solution error is high during the simulation when it was simulated the 2 components together without coupling.


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