Grid independence study

- April 13, 2020 at 3:17 pm
  
  markloutun
  Subscriber
  
  Hello, i'm a real beginner just learned to use ANSYS Fluent for my project. Currently i'm trying to do the grid independence study, can anyone tell or show me how to compute/calculate the relative error which is supposed to be within my acceptable range? I really need help in this. Thanks in advance!
- April 14, 2020 at 3:28 am
  
  Keyur Kanade
  Ansys Employee
  
  First of all if you have student license, you have limitations of 512 cells.
  
  So you may want to check how much refined mesh you can get for grid independence study for your geometry.
  
  Regards,
  
  Keyur
  
  If this helps, please mark this post as 'Is Solution' to help others.
  
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- April 15, 2020 at 8:12 am
  
  markloutun
  Subscriber
  
  Thanks for the reply. Currently i have no issues with cells limitation and i can continue to refine my mesh. However i don't quite understand as to how to calculate or compute the relative error for my grid independence study. I've done 5 mesh refinements but i don't know how to calculate the relative error to compare between the 5 meshes. Can you explain how do i calculate/compute the relative error of my mesh?
- April 15, 2020 at 10:28 am
  
  Rob
  Forum Moderator
  
  You compute values of interest and see how they change as you refine the mesh. Once the value stops changing the error is a % difference against the "correct" answer.