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Can You Trust the Joukowsky
Equation for Waterhammer?


Are you using the Joukowsky equation to predict maximum surge pressures?
Is it your go-to method when analyzing periods of extreme pressure changes?

If so, you are not accounting for real effects, like a wave spreading through
the system or vapor-forming low pressures. The Joukowsky equation is
often applied without understanding its limiting assumptions,
potentially misleading engineers.

In real applications, a robust method that accounts for the complexities
of pressure wave propagation is needed to solve waterhammer problems.
Read on to see what can happen when the Joukowsky equation fails
to give conservative results.





Don’t get misled. Discern when
the Joukowsky equation alone
isn’t conservative for predicting pressure changes.

How do you determine which specific
cases are going to give you the worst response you need to design for?
Purple Mountain Technology Group 
outlines how you might discover
your worst-case surge scenarios.

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When the Joukowsky equation
does not predict maximum waterhammer pressures

Using the Joukowsky equation to estimate pressure surges may provide incorrect, non-conservative pressure calculations. Various issues are discussed
in this paper that result in the calculation of pressures greater than those predicted by the Joukowsky equation. Practicing engineers should apply caution 
when using the Joukowsky equation
as a first approximation of fluid
transient pressures.

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No matter your user level with AFT software products, we have training and
assistance available to help you continue your education, or tools to advance
your knowledge to expert levels.

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Modeling and Mitigating Check Valve Slam -
Theory and Applications

Wednesday, March 1, 2023
10:00 AM - 11:00 AM (MST)


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Training Seminars
Whether you're new or experienced, you'll find AFT seminars
a worthwhile investment of your time. In-person training seminars are held in Colorado Springs, CO, USA and are led by our professional engineers.

Attendees will learn hydraulic flow and waterhammer analysis techniques
while gaining tips and tricks to make the process seamless.

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