Kyushu University Academic Staff Educational and Research Activities Database
List of Papers
Watanabe Seiya Last modified date:2023.04.10

Assistant Professor / Research Institute for Applied Mechanics

1. Yos Panagaman Sitompul, Takayuki Aoki, Seiya Watanabe, Tomohiro Takaki, An ordered active parameter tracking method for efficient multiphase field simulations, Journal of Computational Science, 10.1016/j.jocs.2022.101834, 64, 101834, 2022.10, The multiphase field (MPF) method has been widely used for microstructural evolution and immiscible multiphase flow simulations. In this study, we have developed an ordered active parameter tracking (OAPT) method for efficient simulations of the multiple phases using the MPF method. The algorithm and performance of the OAPT method are presented and compared to those of the conventional active parameter tracking (CAPT) method. The grain growth problems were simulated for demonstration, and the results show good agreement with the conventional one and about four to seven-fold performance improvement. Moreover, we demonstrate the application of the proposed method for the multiphase flow problem, namely the turbulent bubbly downflow. The OAPT method can speed up the calculation by four folds while maintaining the original accuracy..
2. Seiya Watanabe, Changhong Hu, Lattice Boltzmann simulations for multiple tidal turbines using actuator line model, Journal of Hydrodynamics, 10.1007/s42241-022-0037-0, 34, 3, 372-381, 2022.06, In numerical simulations of tidal current farms, large-scale computational fluid dynamic (CFD) simulations with a high-resolution grid are required to calculate the interactions between tidal turbines. In this study, we develop a numerical simulation method for tidal current turbines using the lattice Boltzmann method (LBM), which is suitable for large-scale CFD simulations. Tidal turbines are modeled by using the actuator line (ACL) model, which represents each blade as a group of actuator points in a line. In order to validate our LBM-ACL model, we perform simulations for two interacting tidal turbines, and results of turbine performance are compared with a water tank experiment. The proposed model successfully reproduces the variation of the torque due to wave effects and mean turbine performance. We have demonstrated a large-scale simulation for ten tidal turbines using 8.55×108 grid points and 16 GPUs of Tesla P100 and the simulation has been completed within 9 hours with the LBM performance of 392 MLUPS per GPU..
3. Seiya Watanabe, Changhong Hu, Performance Evaluation of Lattice Boltzmann Method for Fluid Simulation on A64FX Processor and Supercomputer Fugaku, HPCAsia2022: International Conference on High Performance Computing in Asia-Pacific Region,, 1-9, 2022.01.
4. Seiya Watanabe, Takayuki Aoki, Large-scale flow simulations using lattice Boltzmann method with AMR following free-surface on multiple GPUs, Computer Physics Communications, 10.1016/j.cpc.2021.107871, 264, 5, 2021.07.
5. Seiya Watanabe, Shintaro Fujisaki, Changhong Hu, Numerical simulation of dam break flow impact on vertical cylinder by cumulant lattice Boltzmann method, Journal of Hydrodynamics, 10.1007/s42241-021-0028-6, 33, 185-194, 2021.04.
6. Seiya Watanabe,Takayuki Aoki,Tomohiro Takaki, A Domain Partitioning Method Using a Multi-phase-field Model for Block-based AMR Applications, Parallel Computing,, 2020.05.