Fluent suddenly hang during calculation

- May 29, 2022 at 12:54 am
  
  kevin1986
  Subscriber
  
  Hi guys Recently I met a problem. The cluster runs smoothly. But sometimes our simulation hangs several seconds then everything goes back to normal. How can we debug this problem? Please see the following image:
- May 29, 2022 at 6:04 am
  
  kevin1986
  Subscriber
  
  Update: I found even I run it on one node, it still has such issue.
- May 30, 2022 at 7:10 am
  
  DrAmine
  Ansys Employee
  
  Can you benchmark a couple of iterations and check if the residuals are smooth? Which models are involved? Disable all I/O and benchmark again.
- May 30, 2022 at 9:35 am
  
  kevin1986
  Subscriber
  
  Hi, this is a simple single-phase flow in a duct. Actually it is used for test the server performance. Therefore all I/O is disabled. The thing is that it happens when the residuals are very small. Since we just want to test the server performance. Even the residuals are quite small we still run it for long, which may seems to be odd. Then we notice such problem.

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