Physics Asked by user283587 on April 12, 2021
I have a container of inviscid, incompressible fluid with a piston at one end. It is completely closed, except the fact that I can move the piston(say $x_p$). From definition of Bulk Modulus–
$$
mathcal{B}=-Vfrac{partial P}{partial V}
$$
Since $mathcal{B}=infty$ for any incompressible fluid, so any displacement change to the piston will give rise to infinite pressure.
I am thinking how to model this rise in pressure using Navier-Stokes equation. Let me write the simplified equations-
$$
frac{partial{u}}{partial{x}}=0
frac{partial{u}}{partial{t}} + u frac{partial{u}}{partial{x}}=-frac{1}{rho} frac{partial p}{partial x}
$$
If I give some finite value of displacement to piston, how to show that $p rightarrowinfty$?
For an incompressible fluid in such a situation, the pressure is indeterminate. Any pressure can be applied to the fluid (with no motion), not just an infinite pressure. The Euler equation just gives p = constant.
Correct answer by Chet Miller on April 12, 2021
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