2 papers
physics.flu-dyn2026
The underwater Brachistochrone
Mohammad-Reza Alam
The brachistochrone, the curve of fastest descent under gravity, is a cycloid when friction is absent. Underwater, however, buoyancy, viscous drag, and the added mass of entrained…
physics.pop-ph2026
World without Viscosity
Mohammad-Reza Alam
Viscosity, the internal friction of fluids, is among the most consequential yet underappreciated properties in physics. This paper explores what would happen if viscosity vanished…