Controlling shapes of air bubbles in a multi-phase fluid simulation
Controlling shapes is a challenging problem in a multi-phase fluid simulation. Bubble particles enable the details of air bubbles to be represented within a simulation based on an Euler grid. We control the target shapes of bubbles by the gradient vectors of the signed distance field and attraction forces associated with control particles. Our hybrid approach enables to simulate physically plausible movements of bubbles while preserving the details of a target shape. Furthermore, we control the paths of moving bubbles using user-defined curves and the shape of an air bubbles by drag force. An accurate model of the drag force near the fluid surface means that bubbles have realistic ellipsoidal shapes.
Po-Ram Kim, Ho-Young Lee, Jong-Hyun Kim and Chang-Hun Kim, "Controlling shapes of air bubbles in a multi-phase fluid simulation," The Visual Computer, Volume 28, Number 6-8, pp. 597-602, June 2012.
In the multi-phase fluid configuration, we can know that the surface will be constructed like blue lines. First find the stress-zero surface of each cell like red line. Second, make the tendency toward the stress-zero surfaces. These tendencies are equivalent to the surface tension forces and defined on the simulation grids. Finally, we can add them to the velocity as body forces. Then, Navier-Stokes solver will handle this naturally.
The air bubbles gather to form a target dragon model
We controlled the shape and path of air bubbles in a multi-phase fluid simulation to demonstrate user-controlled. The air bubbles are controlled by user-defined curves.
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