Spectrum Results for centrifugal pump cavitation

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  • Last Post 12 February 2018
DKY2Y posted this 02 February 2018

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

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Raef.Kobeissi posted this 05 February 2018

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

Raef Kobeissi

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DKY2Y posted this 12 February 2018

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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