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DY: Fachverband Dynamik und Statistische Physik

DY 55: Poster: Turbulence; Complex Fluids; Microfluidics; Droplets and Wetting

DY 55.1: Poster

Donnerstag, 19. März 2020, 15:00–18:00, P1A

High Performance Free Surface LBM on GPUs — •Moritz Lehmann, Fabian Häusl, and Stephan Gekle — Biofluid Simulation and Modeling, Theoretische Physik VI, Universität Bayreuth

By combining the lattice Boltzmann method (LBM) with the Volume-of-Fluid (VoF) model, free surfaces can be simulated. Besides the challenge of running VoF alongside LBM with massive parallelism on the GPU, the core difficulty of VoF is surface tension calculation using piecewise linear interface construction (PLIC), which until now had no complete analytic solution and so far was solved iteratively - thereby severely slowing down the simulation. We present the full analytic solution for PLIC and apply it to a GPU implementation of VoF-LBM. This excellent performance enables close to real-time simulations of complex free surface phenomena such as drop impacts with all the variety of emerging effects such as crown- and jet-formation or the Plateau-Rayleigh instability. The model is validated by comparison to analytic solutions and experimental data.