ACM Transactions on Graphics
When aiming to seamlessly integrate a fluid simulation into a larger scenario (like an open ocean), careful attention must be paid to boundary conditions. In particular, one must implement special "non-reflecting" boundary conditions, which dissipate out-going waves as they exit the simulation. Unfortunately, the state of the art in non-reflecting boundary conditions (perfectly-matched layers, or PMLs) only permits trivially simple inflow/outflow conditions, so there is no reliable way to integrate a fluid simulation into a more complicated environment like a stormy ocean or a turbulent river. This paper introduces the first method for combining nonreflecting boundary conditions based on PMLs with inflow/outflow boundary conditions that vary arbitrarily throughout space and time. Our algorithm is a generalization of stateof- the-art mean-flow boundary conditions in the computational fluid dynamics literature, and it allows for seamless integration of a fluid simulation into much more complicated environments. Our method also opens the door for previously-unseen postprocess effects like retroactively changing the location of solid obstacles, and locally increasing the visual detail of a pre-existing simulation.
We thank the IST Austria Visual Computing group for helpful feedback throughout the project.
Anaheim, CA, USA
2016-07-24 – 2016-07-28
Bojsen-Hansen M, Wojtan CJ. Generalized non-reflecting boundaries for fluid re-simulation. In: Vol 35. ACM; 2016:96. doi:10.1145/2897824.2925963
Bojsen-Hansen, M., & Wojtan, C. J. (2016). Generalized non-reflecting boundaries for fluid re-simulation (Vol. 35, p. 96). Presented at the ACM SIGGRAPH, Anaheim, CA, USA: ACM. https://doi.org/10.1145/2897824.2925963
Bojsen-Hansen, Morten, and Christopher J Wojtan. “Generalized Non-Reflecting Boundaries for Fluid Re-Simulation,” 35:96. ACM, 2016. https://doi.org/10.1145/2897824.2925963.
M. Bojsen-Hansen and C. J. Wojtan, “Generalized non-reflecting boundaries for fluid re-simulation,” presented at the ACM SIGGRAPH, Anaheim, CA, USA, 2016, vol. 35, no. 4, p. 96.
Bojsen-Hansen M, Wojtan CJ. 2016. Generalized non-reflecting boundaries for fluid re-simulation. ACM SIGGRAPH, ACM Transactions on Graphics, vol. 35. 96.
Bojsen-Hansen, Morten, and Christopher J. Wojtan. Generalized Non-Reflecting Boundaries for Fluid Re-Simulation. Vol. 35, no. 4, ACM, 2016, p. 96, doi:10.1145/2897824.2925963.