When reading about the action of opening a volume at vacuum submerged in a fluid at pressure, the fluid is said to "surge", i.e. to fill the void space (the vacuum). Per Google, surge is defined as a sudden powerful forward or upward movement, especially by a crowd or by a natural force such as the waves or tide. Another source says
Transient flow is usually referred to as surge or water hammer, and the terms are commonly interchanged. But strictly speaking surge is where the mass oscillation of the fluid is the dominating force and the compressibility of fluid is not significant, for example two connecting reservoirs oscillating up and down
So it seems in the study of fluid mechanics, "surge" has a more defined meaning and is related to a force. Can someone tell me another example of fluid surge and what equations that explain/demonstrate the forces producing/(causing by?) surge?
In the above description, it is said that the compressibility of fluid is not significant, and then describe fluid (presumably "incompressible" liquid) flowing back and forth between containers. But I am still having trouble understanding the difference caused by compressibility. Can someone give an example of a compressible fluid in situation that would cause surge flow for an incompressible fluid and show how the compressibility of fluid limits the surge?