value of gravitational acceleration.

- March 5, 2023 at 1:13 pm
  
  pcsingh
  Subscriber
  
  Good evening!
  In my case, fluid flows from top to bottom through a vertical pipe. Because it is an axis-symmetric problem, I have chosen to solve it horizontally, as illustrated in the figure. The left side of the geometry is designated as the inlet boundary condition, while the right side is designated as the outlet boundary condition. I used 0 for the y component of gravitational acceleration. I'm not sure about the value of gravitational acceleration. What should I enter for the x component of gravitational acceleration?
- March 5, 2023 at 1:22 pm
  
  pcsingh
  Subscriber
  
  Origin is taken on the left side of the above figure (bottom point of the inlet).
- March 6, 2023 at 6:56 am
  
  SRP
  Subscriber
  
  Hi,
  If you want the motion to go from top to bottom, or from +x to -x, you can use -9.81 in the x direction for gravitational acceleration.
  Thank you
- March 6, 2023 at 11:08 am
  
  pcsingh
  Subscriber
  
  Thank you @SRP sir.
  I have chosen the bottom point of the inlet as the origin and flow are happening from left (inlet) to the right (outlet), as shown in the figure. Then, in this case, the value of g will be 9.81 in the x direction. Please correct me if I am wrong.
  Regards
  Prakash Singh

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