Need help with a pipe flow simulation with pressure inlet and outlet boundary conditions

- April 6, 2022 at 5:32 pm
  
  karoo178
  Subscriber
  
  Hello,
  My name is Khanh. I am trying to learn about different inlet and outlet boundary conditions in Ansys. However, I run into a problem with a made-up example where I tried to simulate a flow in a pipe with pressure inlet and outlet boundary conditions.
  The pipe dimension was: radius = 10 mm, and length = 20 mm
  The inlet pressure was 2 bar or 200,000 Pa and the outlet pressure was 1 atm or 101,325 Pa.
  I set the operating pressure at 101,325 Pa, inlet gauge total pressure 98,675 Pa and outlet gauge pressure 0 Pa. I used air at 20 C as the fluid.
  When I ran the simulation, the inlet pressure did not stay constant as I expected it should. Could anyone please help explain what is going on? I feel like I have misunderstood the physics very badly. Please help.
- April 7, 2022 at 5:07 am
  
  Keyur Kanade
  Ansys Employee
  
  Please use velocity inlet and pressure outlet boundary condition as it is most robust. Please go through help manual for more details
  Regards Keyur
  How to access Ansys Online Help Document
  Guidelines on the Student Community

Viewing 1 reply thread

You must be logged in to reply to this topic.

Ansys Innovation Space

Earth Rescue – An Ansys Online Series

The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.

Ansys Blog

Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.

Trending discussions