velocity based on pressure

- July 10, 2020 at 10:18 am
  
  Guillaume ANFOSSI
  Subscriber
  
  Hello,
  
  Here's a question from one of our prospects:
  
  "Is it possible to set a velocity based on pressure at that same point in DL or AIM ?
  
  This would be extremely useful to me, because for vacuum pumps there is a linear relationship between flow rate and vacuum. So I could do a very consistent transient simulation."
  
  Thanks for your help.
- July 10, 2020 at 11:44 am
  
  Naresh Patre
  Ansys Employee
  
  Hello GUICAD
  
  I doubt this is doable, but let me cross check and get back to you.
- July 14, 2020 at 2:12 am
  
  Naresh Patre
  Ansys Employee
  
  Hello GUICAD
  
  In Discovery Live, it is not possible to set velocity based on pressure.
  
  Regarding Discovery AIM, I got following suggestion from the development team:
  
  It is possible to use an expression to define the Velocity based on a results variable. So, in theory, it is possible to define a velocity based on a calculated pressure at the same location. However, in practice, I think it would be very difficult to get a setup like this to converge. I would recommend starting off with a very simple steady-state flow solution to see if convergence could be obtained before trying this setup with the real geometry and a transient model.
  
  Can you share the details of customer that is trying to setup this case? If you send the details to ansys-discovery-support@ansys.com

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