Inverting Stiffness Matrix at every load step of a static structural analysis?

- June 10, 2022 at 10:38 am
  
  Nicolas
  Subscriber
  
  Hi All,
  Subject: Inverting Stiffness Matrix at every load step of a static structural analysis?
  Let's consider a large FE model we want to solve in static structural.
  We have to solve for instance 1000 different load cases (say pressure distribution) based on the exact same model and boundary conditions.
  I wonder how I can check if ANSYS inverts the stiffness matrix at every load step of the static structural analysis.
  Or if it uses some restart option (or similar) to invert the [K] matrix only once, and then only solve the equation Displ = [K]^-1 * Loads at each load step.
  Inverting [K] for large model is time consuming.
  I have gone through ANSYS help about restart but it is not 100% clear about this specific subject.
  Obviously if it is not the case, I would like to find a way of doing that.
  Anyone can help here?
  Best, Nicolas
- June 11, 2022 at 10:15 am
  
  Peter Newmann
  Subscriber
  
  Nicolas, a restart is not needed to reuse the stiffness matrix. If you have a multi-step solution, you can force the solver to reuse the stiffness matrix by using the Command KUSE,1.

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