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A water tank subjected to frame motion

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Old   August 7, 2022, 03:39
Smile A water tank subjected to frame motion
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Abdullah
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Hi,
I am simulating a water tank subjected to discontinous velocity. At the point of discontinuity a pressure surge is seen in "area weighted average Max pressure" curve then it stablizes. I just want to know that is this term corrwcr or not.
Example:
Velocity changes at 10secs (linear Velocity profile is used)
At 9.995 pressure is 5000Pa
At 10.005 pressure is 5500 Pa
At 10 pressure is 120 KPa
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Old   August 7, 2022, 05:03
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Which CFD software do you use?
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Old   August 7, 2022, 05:21
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I am using ansys fluent
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Old   August 8, 2022, 10:23
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Are you familiar with the impulse-momentum form of Newton's 2nd law? You have a momentum change when the velocity changes - if the change is very rapid then you can easily generate an impulsive type force. A better way to think of it is that you would need to apply a large impulse to generate the observed or desired change in velocity. But fundamentally you have the impulse I = (Mass)x(Velocity2 - Velocity1). The impulse is the integral of the applied force over the time applied, so for your case it could be approximated as 0.5*(Timestep)*(120000 Pa - 5000 Pa)*(Area of application). I don't know your setup, so that's as far as I can go. But you should be able to work out the rest.
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frame motion, pressure and velocity, sloshing tank, surge tank

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