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What are some examples of moving a fluid without changing pressure?

Physics Asked on May 27, 2021

Bernoulli’s principle states that, in a steady, incompressible, inviscid flow, the sum of all forms of mechanical energy in a fluid along a streamline is the same at all points on that streamline. This requires that the sum of the fluid’s kinetic energy, gravitational potential energy, and internal energy (i.e. pressure-volume energy) remains constant.

Real fluids are compressible and have viscosity.

Are there any scenarios that would produce a fluid flow without there being a pressure change? That is, can a fluid flow occur by changing only the fluid’s kinetic and/or gravitational potential energy while keeping the fluid’s pressure at all points along the flow constant? These questions are open for both the idealized fluid (incompressible, inviscid) and real fluid (compressible, viscous) scenarios.

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