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Getting reliable results from Bentley Hammer

Hi,

I am modelling a simple system to compare the results to some codes that I have. But, despite having all the configurations similar to codes, I cannot get similar pressure fluctuation. Could you please have a look and let me know the reason?

Thanks in advance.

Regards,

Example 1.xlsx8233.Example 1.zip

Parents Reply
  • But for the other one, I didn't have the negative pressure (as you see below). Do you have any comment on improving accuracy?

    It could be due to a difference in how the valve characteristics are modeled, or with the discharge-to-atmosphere (D2A) pressure vs. flow characteristics. What assumptions are you making in your program for these elements? This article explains the Ball valve characteristics and this article explains how the D2A works. If you change the valve type, you will see a large difference in the pressure time history. For example if you try the Globe valve type instead of Ball, the results will be quite close.


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows
    Bentley Communities Site Administrator
    Bentley Systems, Inc.

    Answer Verified By: Hiwa 

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