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• W2053018221 abstract "We provide a novel simulation method for incompressible free surface flows that allows for large time steps on the order of 10--40 times bigger than the typical explicit time step restriction would allow. Although semi-Lagrangian advection allows for this from the standpoint of stability, large time steps typically produce significant visual errors. This was addressed in previous work for smoke simulation using a mass and momentum conserving version of semi-Lagrangian advection, and while its extension to water for momentum conservation for small time steps was addressed, pronounced issues remain when taking large time steps. The main difference between smoke and water is that smoke has a globally defined velocity field whereas water needs to move in a manner uninfluenced by the surrounding air flow, and this poses real issues in determining an appropriate extrapolated velocity field. We alleviate problems with the extrapolated velocity field by not using it when it is incorrect, which we determine via conservative advection of a color function which adds forwardly advected semi-Lagrangian rays to maintain conservation when mass is lost. We note that one might also use a more traditional volume-of-fluid method which is more explicitly focused on the geometry of the interface but can be less visually appealing -- it is also unclear how to extend volume-of-fluid methods to have larger time steps. Finally, we prefer the visual smoothness of a particle level set method coupled to a traditional backward tracing semi-Lagrangian advection where possible, only using our forward traced color function solution in areas of the flow where the particle level set method fails due to the extremely large time steps." @default.
• W2053018221 created "2016-06-24" @default.
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• W2053018221 date "2012-07-29" @default.
• W2053018221 modified "2023-09-26" @default.
• W2053018221 title "Simulating free surface flow with very large time steps" @default.
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• W2053018221 doi "https://doi.org/10.5555/2422356.2422373" @default.
• W2053018221 hasPublicationYear "2012" @default.
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