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Convergence Criteria

- June 20, 2026 at 11:39 am
  
  abdulltf013
  Subscriber
  
  How do we determine the right value for "Absolute Criteria" in different simulations? I want to study this topic on YouTube, but I’m not sure which keywords are best to search for.
- June 22, 2026 at 7:34 am
  
  NickFL
  Subscriber
  
  That “IS” the question. There is no right value. It is dependent upon the grid, the equations being solve, etc. It is not the end-all-be-all that people try and make it. We also have to use monitor points to determine whether our solution is converged or not. For example, I am currently simulating the flow through a chemical reactor. If I look at the residuals for the equations, I often have residuals 1E-7 or lower. But if I look at the mixture fraction at the exit, it is not converged. So do not put all your eggs in the residual basket.
  It is important to remember what the residuals are. It is the difference between the two sides of the equation. We want these to be zero, but they never will. We typically solve until our residuals have leveled out and where the monitor points we have created are also stationary between iterations.
  - June 22, 2026 at 11:44 pm
    
    abdulltf013
    Subscriber
    
    Thank you very much sir, i'm understand better right now

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