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Negative Pressure in CFD

- June 25, 2020 at 12:01 pm
  
  AlfredOloo
  Subscriber
  
  Hi,
  
  I have run a CFD simulation using FLUENT on an airfoil for pressure distribution as shown in the picture below.
  
  On the other hand, I do not understand the NEGATIVE PRESSURE values of as shown in the legend, why do I have negative pressure?
  
  And what is this pressure: total, static, gauge, etc
- June 25, 2020 at 12:06 pm
  
  DrAmine
  Ansys Employee
  
  Look into absolute pressure.
- June 25, 2020 at 1:55 pm
  
  RK
  Ansys Employee
  
  Hello,
  
  Plot velocity vectors too for better understanding of negative pressure. Refer to the Fluent Theory guide for the definitions: https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v201/en/flu_th/flu_th_sec_compressible_physics.html?q=total%20pressure
- June 30, 2020 at 10:01 am
  
  AlfredOloo
  Subscriber
  
  Seems like it is absolute pressure.
  
  Thank you
- June 30, 2020 at 12:25 pm
  
  DrAmine
  Ansys Employee
  
  What do you mean?
- July 3, 2020 at 6:43 am
  
  AlfredOloo
  Subscriber
  
  Hi,
  
  I mean the pressure values given here seem to be absolute pressure and not gauge. Am I right?
- July 3, 2020 at 7:08 am
  
  DrAmine
  Ansys Employee
  
  Please check the absolute pressure in Fluent whether is negative or not.

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