Implementation of a direct-addressing based lattice Boltzmann GPU solver for multiphase flow in porous media

Yang，Guang1; Chen，Yu2; Chen，Simeng2; Wang，Moran1

2023-10-01

10.1016/j.cpc.2023.108828

Computer Physics Communications   Impact Factor & Quartile

0010-4655

1879-2944

GPU accelerated lattice Boltzmann (LB) simulations of multiphase flow in porous media have become a powerful tool to study fluid displacement process in porous media. For porous structures with a very low porosity, indirect-addressing memory access methods are preferred due to significantly reduction of the memory footprint despite that those methods are more difficult to implement and the resulting performance may be more sensible to the computing architectures, such as cache hierarchy and size. The direct-addressing methods are straightforward to implement and are able to archive high throughput when the porosity is large, while the methods become less efficient when the structures are too sparse. Nevertheless, the direct-addressing methods combined with multi-block grid technique are promising for many applications. In this work, we present a hybrid-way to tackle multiphase flow simulations in porous media, where the direct-addressing method is employed for the main LB evolution while the indirect-addressing method is employed for the complex boundary conditions. The CSF-based LB color-gradient multiphase model and the geometry-based wetting model are employed to increase accuracy and stability. Thanks to the utilization of AA-pattern streaming scheme, non-slip boundary condition of arbitrary orientation can be enforced without extra cost. We perform comprehensive analysis of the computational performance of the present solver on NVIDIA GPUs. For typical sandstones, our results show that the present implementation is able to achieve over 1.5 speedup compared with other direct-addressing schemes on V100 and A100, respectively and, particularly, the computational performance of the boundary kernels is greatly increased thanks to the increased L2 cache size of the latest GPUs.

Direct addressing GPU computing Lattice Boltzmann Multiphase flow

SCI

English

Others

National Natural Science Foundation of China[12272207];National Key Research and Development Program of China[2019YFA0708704];

Computer Science ; Physics

Computer Science, Interdisciplinary Applications ; Physics, Mathematical

WOS:001044802000001

ELSEVIER

PHYSICS

2-s2.0-85164699220

Scopus

1.Department of Engineering Mechanics,Tsinghua University,Beijing,100084,China
2.Department of Mechanics and Aerospace Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Yang，Guang,Chen，Yu,Chen，Simeng,et al. Implementation of a direct-addressing based lattice Boltzmann GPU solver for multiphase flow in porous media[J]. Computer Physics Communications,2023,291.

Yang，Guang,Chen，Yu,Chen，Simeng,&Wang，Moran.(2023).Implementation of a direct-addressing based lattice Boltzmann GPU solver for multiphase flow in porous media.Computer Physics Communications,291.

Yang，Guang,et al."Implementation of a direct-addressing based lattice Boltzmann GPU solver for multiphase flow in porous media".Computer Physics Communications 291(2023).