UDS Residence Time

- April 24, 2024 at 12:55 pm
  
  Ahmed Eissa
  Subscriber
  
  Hi, I am trying to calculate the residence time. Firstly, can I use pathline time?
  Secondly, I followed all the steps here getsolutionfile (ansys.com) and the UDS residuals are ALWAYS ZERO, what should I do? TBH, I am not sure about step 5. Below are screenshots of my entries.
  
  Thanks a lot.
- May 3, 2024 at 8:43 am
  
  Prashanth
  Ansys Employee
  
  Hi: You are supposed to hook that source to the user scalar source term
- May 3, 2024 at 4:42 pm
  
  Ahmed Eissa
  Subscriber
  
  Thank you so much.
  So instead of using mass source, I will be using scalar sourcem right?
  If so, I think we may need to change step 5 in the pdf file mentioned above.
  5. Under Source Terms, enable (Mass) sources and specify the fluid density (If the density varies by location, you can use a UDF).