time average for unsteady case

- January 18, 2019 at 4:37 am
  
  zels496
  Subscriber
  
  I am simulation a flow over a porous square cylinder and I am interested in calculating the time average values for p and u over a period of time, also how can I draw time-averaged pressure and velocity contours?
- January 18, 2019 at 4:58 am
  
  Keyur Kanade
  Ansys Employee
  
  please create custom field function for variable you want.
  
  use data sampling for time average values.
  
  following links may help you.
  
  /forum/forums/topic/time-averaging-over-different-time-periods/
  
  https://www.youtube.com/watch?v=9ebSH84vIWo
  
  if this helps you, please mark this post as 'is solution' to help others on forum.
- January 18, 2019 at 5:23 am
  
  zels496
  Subscriber
  
  here is a way using Data Sampling for Time Statistics option in fluent I think and it is easier ??
  
  I am not quite sure but I have found on fluent
  
  https://www.sharcnet.ca/Software/Fluent6/html/ug/node1045.htm
- January 18, 2019 at 5:31 am
  
  Keyur Kanade
  Ansys Employee
  
  go to solution - run calculation - advanced - options - data sampling
- January 20, 2019 at 12:48 am
  
  zels496
  Subscriber
  
  how to define the time for the start and end of time sample?
  
  if I want to start from 100 sec to 200 sec, not from the start of simulation time
- January 21, 2019 at 4:29 am
  
  Keyur Kanade
  Ansys Employee
  
  run till 100 sec.
  
  then make data sampling on.
- January 22, 2019 at 12:06 am
  
  zels496
  Subscriber
  
  how to get the time-averaged results, it can be seen also from cfd post ?
- January 22, 2019 at 2:23 am
  
  zels496
  Subscriber
  
  what is the sampling interval ??
- January 22, 2019 at 3:28 am
  
  Keyur Kanade
  Ansys Employee
  
  sampling interval is the interval where variable values will be taken into sampling considerations.
  
  please check the help manual for more details.
  
  /forum/forums/topic/how-to-access-the-ansys-online-help/
- January 23, 2019 at 1:54 am
  
  zels496
  Subscriber
  
  if I want to average from 100s to 200 sec should I set the sampling interval to 100 sec?
  
  I have tried sampling interval 1 but the average was equal to the last time step result
  
  it is not clear for me how to set a value for it even after checking fluent tutorials
- January 23, 2019 at 3:09 am
  
  Keyur Kanade
  Ansys Employee
  
  sampling interval is at what time step you want to take sample.
  
  i recommend you to go through help as mentioned above.