Controlling Fluid Simulations with Custom Fields in Houdini Master ...

Figure 2: High resolution 2d uid containers controlled by information fromprojected particles created by ILM. Image taken from [10]Figure 3: Advecting the simulation with curl noise where turbulent energy isdetected. Image taken from [14]tion can be raised quite high. The interesting part is that the relatively smallamount of particles are used as a way to dene the high resolution elds. Theparticles represent a custom eld, this hints towards the idea that the customeld does not need to have a very high resolution as some of the simulationsonly used 20.000 to 100.000 particles.3.3 Research3.3.1 Introducing noise in the velocity eldAnother example of the use of a custom eld to give more interesting resultsin uid simulation is the introduction of curl-noise for procedural uid ow [3].They generate turbulent velocity elds based on Perlin noise. This type of noiseis procedural but could just as well be added to uid simulations, which is whatis being done in [14] with the additional condition that the curl noise is notadvecting the velocity everywhere, but only where their physically motivatedenergy model dictates it as can be seen in Figure 3.5