Abstract A Stable Fluids Approach To Multiple Types Of Smoke Janus Dam Nielsen ∗

Figure 1: Two types of smoke interacting like the exhaust of aircrafts at aircraft shows. This paper presents a stable method for simulating different types of smoke in the same scene under the presence of varying temperature and vorticity confinement. Multiple types of smoke are naturally occurring simultaneously in many different situations like smoke from different fires, smoke from different parts of the same fire or in aircraft shows where a number of aircrafts emit different colors of smoke. In these kinds of situations temperature differences and rotational details are often important to get physically realistic and visually appealing smoke. The presented method is based on physical realistic simulation of smoke using semi-Lagrangian advection and the conjugate gradient method to solve the Navier Stokes equations similar to the Stable Fluids method and extends the Stable Fluids method with multiple types of smoke moving in the same velocity field, a temperature field, and vorticity confinement for more realistic simulations of turbulent flows. The method adds three techniques to the Stable Fluids method which gives the possibility of simulating multiple types of smoke realistically. The results produced by combining the additional techniques are visually satisfactory and realistic. Results obtained when comparing only each of the additional techniques are comparable to the results obtained by others