Problem with fixed support

- March 11, 2022 at 10:32 am
  
  ggew
  Subscriber
  
  Hi everyone!
  I want to solve this FSI simulation and I try to fix my model at the edge, but it don't solve. The elements that I use are 3D shell. The error message is the following:
  *** ERROR ***                          CP =     29.594  TIME= 19:02:27
  There is at least 1 small equation solver pivot term (e.g., at the UX
  degree of freedom of node 1628). Please check for an insufficiently
  constrained model.
  
  The connections are ok because I checked them. I don't understand what I have to do to fix it.
  What can I do?
- March 11, 2022 at 12:25 pm
  
  jonsoln
  Subscriber
  
  Did you check which node gave the error? I would recommend duplicating the static structural analysis and replacing the duplicate with a modal analysis. Remove the pressure load and solve. This will show you any unconstrained rigid body motion easily.
- March 11, 2022 at 12:40 pm
  
  Aniket
  Ansys Employee
  
  Thank you!
  Please check the following course and see if you find it useful:
  Topics in Modal Analysis - ANSYS Innovation Courses
  -Aniket
  How to access Ansys help links
  Guidelines for Posting on Ansys Learning Forum

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