UDS, UDM writing issue

- April 20, 2023 at 7:42 am
  
  shadowfax7
  Subscriber
  
  Hello,
  I am trying to program a body force on particles using DPM.
  To calculate and implement my code I reserve 2 UDS and 2 UDM.
  The UDM contain values needed to calculate the force but I need the gradient of these values.
  Therefore, I use the 2 UDS whose values I set equal to the UDM values, making use of the patch function after initialization and custom defined field functions.
  However, when I start the simulation, these values start dropping each iteration until they reach zero.
  
  How can I solve this issue?
- April 20, 2023 at 12:14 pm
  
  Rob
  Ansys Employee
  
  What is there in the code to maintain the UDS values during the simulation?
  Have a look at https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v231/en/flu_udf/flu_udf_DataAccessMacros.html%23flu_udf_sec_udm_macros 3.2.12.6. Example UDF that Utilizes UDM and UDS Variables

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