We present the OpenLB package, a C++ library providing a flexible framework for lattice Boltzmann simulations. The code is publicly available and published under GNU GPLv2, which allows for adaption and implementation of additional models. The extensibility benefits from a modular code structure achieved e.g. by utilizing template meta-programming. The package covers various methodical approaches and is applicable to a wide range of transport problems (e.g. fluid, particulate and thermal flows). The built-in processing of the STL file format furthermore allows for the simple setup of simulations in complex geometries. The utilization of MPI as well as OpenMP parallelism enables the user to perform those simulations on large-scale computing clusters. It requires a minimal amount of dependencies and includes several benchmark cases and examples. The package presented here aims at providing an open access platform for both, applicants and developers, from academia as well as industry, which facilitates the extension of previous implementations and results to novel fields of application for lattice Boltzmann methods. OpenLB was tested and validated over several code reviews and publications. This paper summarizes the findings and gives a brief introduction to the underlying concepts as well as the design of the parallel data structure.

我们介绍了OpenLB软件包，这是一个C ++库，为晶格Boltzmann模拟提供了灵活的框架。该代码是公开可用的，并在GNU GPLv2下发布，该代码允许改编和实现其他模型。可扩展性得益于模块化代码结构，例如通过利用模板元编程实现的。该软件包涵盖了各种方法性方法，适用于各种运输问题（例如，流体，颗粒和热流）。此外，STL文件格式的内置处理功能允许在复杂的几何图形中简单地设置仿真。MPI和OpenMP并行性的利用使用户能够在大规模计算集群上执行那些仿真。它要求的依赖关系最少，并包括几个基准案例和示例。这里介绍的软件包旨在为学术界和工业界的申请人和开发人员提供一个开放的访问平台，这有助于将以前的实现和结果扩展到晶格玻尔兹曼方法的新应用领域。OpenLB已通过多个代码审查和出版物进行了测试和验证。本文总结了研究结果，并简要介绍了基本概念以及并行数据结构的设计。