Force components on liquid-vapor interface in CFD-post!

- October 31, 2022 at 12:26 am
  
  Nguyen Van Toan
  Subscriber
  
  Hello everyone,
  I have a simulation domain shown in below figure.
  How can I extract force components on the liquid-vapor interface using CFD-post? (force components include: viscous, pressure, thrust force caused by fluid flow).
  Thank you so much!
- October 31, 2022 at 7:32 am
  
  DrAmine
  Ansys Employee
  
  You need to calculate the scalar shear stress components at the the interface. That is the tricky part. The pressure force is straightforward.
  - October 31, 2022 at 8:31 am
    
    Nguyen Van Toan
    Subscriber
    
    Thank you for your reply !
    I found this information in ANSYS help:
    I have saved data file including wall shear stress components. However, it seems that "the viscous force is added only in the wall boundary".
    The pressure force is straightforward. How about the "mass flow force"?
    I found the command "force_x()", is it total force? How it can be calculated by ANSYS?
    Thank you so much!
- October 31, 2022 at 8:35 am
  
  DrAmine
  Ansys Employee
  
  Yes: at any other boundary rather wall you need to get the shear stress components on your own by calculating the stress components.
  
  If you want to get viscous contributions at your liquid-gas interface: you need to create several expressions to calculate the stress.