u (m/s), v (m/s), and w (m/s) represent the different components of the velocity p (N/m 2) represents the pressure ν (m 2/s) is the viscosity of the fluid and ρ (kg/m 3) is the density of the fluid. These represent a time-dependent system of partial differential equations (or PDEs, for short) that can be solved with appropriate boundary conditions. So, how does one go about writing code that will simulate fluid flow? In general, the answer is quite complicated, but with a few assumptions can be made more tractable.Īssuming that the simulation will take place under normal conditions, that is, at a reasonable temperature and at sea level, the equations that govern the motion of a fluid are: Since the focus in movies is on aesthetics, the flow may not be accurate. The special effects are meant to give the viewer a realistic look at the motion of water or air. We have all seen special effects and visualizations of fluids in movies. Let’s first start with understanding these equations. We would now call such swirling motions vortices, and we have a systematic way of understanding the behavior of fluids through the Navier–Stokes equations. He often observed that water had a swirling motion, sometimes big and sometimes small, as shown in the sketch below. Leonardo da Vinci made several sketches of the motion of fluid and made a number of observations about how water and air behave. The motion of fluid flow has captured the interest of philosophers and scientists for a long time.
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