Forces in negative direction cancelling forces in positive direction.

- March 19, 2022 at 12:24 am
  
  jnelsen33
  Subscriber
  
  I am using Fluent to simulate hurricane force winds on a home. I just realized that when I calculate values for force or lift, that the forces in negative directions are canceling forces in positive directions. Is there a way to set it up to take the absolute value of each face? For what I'm simulating , these forces would not cancel...they would both be pulling the structure apart.
  Thank you.
- March 21, 2022 at 11:46 am
  
  Rob
  Ansys Employee
  
  Split the surfaces up so you report each one separately.
- March 21, 2022 at 9:07 pm
  
  jnelsen33
  Subscriber
  
  Yes, that's actually how I was able to notice it, I named every face and solved by zone. I am confused by the way lift calculates any of these values. I strictly measured the lift on back side of my roof and got the value from Fluent in each direction separately, and then I found the overall lift that Fluent gives for the back side of the roof by selecting all vectors. The value isn't a sum of the three that I got and it's also not the magnitude, so I'm completely lost on how it's getting it's values. But I think we will have to split them up and use the absolute for each face and find the magnitude for each and treat them individually.
  Thanks.
- March 22, 2022 at 11:28 am
  
  Rob
  Ansys Employee
  
  Read up on the definitions in Fluent - then check what you're reporting and what any reference values are.

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