Spectrum Results for centrifugal pump cavitation

- February 2, 2018 at 6:00 pm
  
  DKY2Y
  Subscriber
  
  I have just completed my impeller design using Vista CPD and created the cavitation simulation on Ansys CFX. However, I have carried out a transient simulation of the impeller using the following data:
  
  Total Time= 5s
  Time steps=0.01 s
  Initial time=0 s
  
  Output control
  Backup:
  Time step=100
  
  Transient Results:
  Time step interval=10
  
  Does the spectrum results for the transient simulation look sensible as seen from the attached pictures? The data for the pump was obtained from a journal article where the pump has a high flow rate and high output pressure hence this explains why the transient results shows a high output
- February 5, 2018 at 10:33 pm
  
  Raef.Kobeissi
  Subscriber
  
  I think a time step of 0.01s is not sufficient for such analysis, it needs to be 1e-3 minimum (also it depends on your mesh resolution).
  
  Regards
- February 12, 2018 at 4:22 pm
  
  DKY2Y
  Subscriber
  
  Hi, thank you for your assistance. I have changed my time step to 1e-3 seconds just yesterday. Does it look like it is converging properly as seen in the attached picture.

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