Dear all，

I've failed many times. currently I am doing FSI for carotid arteries (fluent + mechanical, system coupling) displayed in figure 1. in the process of system coupling, I have two questions: ① this Solution Control "Allow Simultaneous Update" was False(figure 2); ②when update solution: COUPLING ITERATION = 2 in COUPLING STEP = 1 lasted a long time about 1 hour, (figure 3) the final result was also failed: Update failed for the Solution component in System Coupling. The coupled update for system Transient Structural threw an exception. Error updating cell Solution in system Transient Structural. (figure 4)

please can any one answer to this.

Thank you.