basic UDF setup

- July 4, 2017 at 10:44 pm
  
  mblee
  Subscriber
  
  Hello, I just need help with the basics of loading a UDF into Fluent. I have an example UDF that I got off of the internet but I keep running into different errors.
- July 18, 2017 at 9:56 pm
  
  pgl
  Ansys Employee
  
  Firstly, are you sure that you need to use a UDF? Can you explain what type of simulation you are trying to achieve? I ask because ANSYS Fluent has a tremendous amount of built-in functionality.
  
  UDF's are covered in the ANSYS Fluent Customization Manual, this documentation is included with the product. There are quite a few examples in the doc.
  
  My best guess is that the UDF you got from the internet is intended to be used with an older version of Fluent, and the errors you are getting relate to either obsolete commands, or commands that have changed their syntax. Review the UDF and check each command with the version of the Fluent doc that you are using.
- September 6, 2017 at 7:10 am
  
  DrAmine
  Ansys Employee
  
  Can you tell us what are you trying to do?
- October 21, 2019 at 11:07 am
  
  Zion
  Subscriber
  
  Please could you kindly explain to me when does one decide to use a parallel or serial "Processing Options" during simulation using a UDF CODE?
  
  Error:
  
  FLUENT received fatal signal (ACCESS_VIOLATION)
  
  1. Note exact events leading to error.
  
  2. Save case/data under new name.
  
  3. Exit program and restart to continue.
  
  4. Report error to your distributor.
  
  Error Object: #f
- October 21, 2019 at 2:35 pm
  
  DrAmine
  Ansys Employee
  
  Check the part in the documentation related to parallelization of UDF. Generally whenver global sums or reduction is requierd or whenver the UDF macro does not provide thread to cell or face you need to make it parallel.

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