FSI – highly distorted elements

- July 1, 2020 at 4:16 pm
  
  NicoKlein
  Subscriber
  
  Good morning,
  
  I am currently simulating a fluid-structure interaction of a channel driven cavity flow and a plate with pulsatile flow. The velocity profile is sinusoidal. With a sine frequency of 1 Hz, everything worked. But now I raised the frequency to 2 Hz and I get the error highly distorted element every time.
  
  The mesh quality of the solid plate and the fluid domain is really good with aspect ratios < 1.3 and element quality > 0.98.
  
  What I am wondering about is the huge change in the receiving force within one coupling step:
  
  Coupling Iteration 2
  
     RECEIVING FORCE FX SUM = -0.31654E-02
       RECEIVING FORCE FY SUM =   6.3474
       RECEIVING FORCE FZ SUM = -0.16165E-05
  
  Coupling Iteration 3
  
     RECEIVING FORCE FX SUM =   26551.
       RECEIVING FORCE FY SUM = -0.32817E+11
       RECEIVING FORCE FZ SUM = -0.25715E+06
  
  Can anyone help to find the reason for the errors? I defined the material Aluminum only with density, Young's Modulus and Poissons ratio - is that enough?
  
  Thanks in advance!
- July 1, 2020 at 4:26 pm
  
  NicoKlein
  Subscriber
  
  In addition to that: the time step size of the transient analysis is 0.02 s

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