Learning Forum

[javat33489]

Hello everyone.
The task is to determine water hammer. With what force will the water hit the ball on the seat.

Water is supplied to the well (pipe), in front of the water there is a steel ball, the water will move the ball strongly until it hits its seat. It is necessary to understand with what force the impact will be, whether it will deform the seat:

In which module is it easiest to do this? It is necessary to take into account the density of the liquid. Is it possible to do this in static or transient analysis? Or only fluent? Tell me a brief sequence of actions and then I will figure it out. Thank you.

[Rob]

What is the definition of force? Think back to fundamentals. 

[javat33489]

Sir, what are you getting at?

[Rob]

What is force? Ie what are the units, if you break them down. 

[javat33489]

ah sir i got it this is force in newtons

[javat33489]

Sir I need to understand with what force the ball will hit the saddle

[Rob]

Yes, and the pressure will determine the ball speed (and if there's any fluid cushion) as it hits. 

[javat33489]

The liquid cushion can be ignored.
Are you suggesting to calculate the ball speed by pressure and use static analysis?

[Rob]

It's a good start - always do a hand calc before using simulation tools. If the force can't be contained why run a model to show how badly it fails? 

[javat33489]

 

Sir, I didn’t understand you. Please write in more detail how to approach this task in ANSYS now?

 

[Rob]

If you can ignore the cushioning then Mechanical may be a good choice. 

[javat33489]

I think that density has an effect.
Tell me your version, how would you calculate this problem?

[Rob]

I'd look at Fluent 6DOF if fluid was important and then pass the speed/force over to Mechanical (or rather I'd get one of our Mech staff to do that bit).