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Item type:Publication, Access status: without files , Real-time simulation of impact waves in LNG ship tanks with Lattice Boltzmann single-phase models(International Society of Offshore and Polar Engineers (ISOPE), 2016); ; ; This contribution addresses the efficient numerical simulation of wave impact on the side walls of two-dimensional containers. For the flow field calculations, an efficient Lattice Boltzmann Method (LBM) is used. Whilst modeling essentially similar physics as classical continuum mechanics procedures, LBM features a number of performance-related advantages, particularly concerning data locality and parallel computing. For the numerical analysis of wave impact, a single-phase model is employed. The model tracks the free surface with a conventional VOF technique and represents the aerodynamics by proper kinematic and dynamic free surface boundary conditions at the phase interface. The numerical simulations are conducted with the GPU-accelerated free-surface flow solver ELBE. Thanks to the high efficiency of the numerical method and the GPU implementation, the sloshing behavior can be predicted in (or near) real-time, including impact pressure details. In this contribution, the numerical results will be discussed in detail, including a series of 2D validation cases. Limitations of the free-surface model and potential extensions to fully-resolved air-phase dynamics will be discussed.Publicationtype: Conference Paper59 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Towards online visualization and interactive monitoring of real-time CFD simulations on commodity hardware(Multidisciplinary Digital Publishing Institute (MDPI), 2015-09-11); ; Real-time rendering in the realm of computational fluid dynamics (CFD) in particular and scientific high performance computing (HPC) in general is a comparably young field of research, as the complexity of most problems with practical relevance is too high for a real-time numerical simulation. However, recent advances in HPC and the development of very efficient numerical techniques allow running first optimized numerical simulations in or near real-time, which in return requires integrated and optimized visualization techniques that do not affect performance. In this contribution, we present concepts, implementation details and several application examples of a minimally-invasive, efficient visualization tool for the interactive monitoring of 2D and 3D turbulent flow simulations on commodity hardware. The numerical simulations are conducted with ELBE, an efficient lattice Boltzmann environment based on NVIDIA CUDA (Compute Unified Device Architecture), which provides optimized numerical kernels for 2D and 3D computational fluid dynamics with fluid-structure interactions and turbulence.Publicationtype: Journal ArticleScopus© Citations 5 394 533 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , A fast and rigorously parallel surface voxelization technique for GPU-accelerated CFD simulations(2015-06-03); ; This paper presents a fast surface voxelization technique for the mapping of tessellated triangular surface meshes to uniform and structured grids that provide a basis for CFD simulations with the lattice Boltzmann method (LBM). The core algorithm is optimized for massively parallel execution on graphics processing units (GPUs) and is based on a unique dissection of the inner body shell. This unique definition necessitates a topology based neighbor search as a preprocessing step, but also enables parallel implementation. More specifically, normal vectors of adjacent triangular tessellations are used to construct half-angles that clearly separate the per-triangle regions. For each triangle, the grid nodes inside the axis-aligned bounding box (AABB) are tested for their distance to the triangle in question and for certain well-defined relative angles. The performance of the presented grid generation procedure is superior to the performance of the GPU-accelerated flow field computations per time step which allows efficient fluid-structure interaction simulations, without noticeable performance loss due to the dynamic grid update.Publicationtype: Journal Article97 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , A next-generation CFD tool for large-eddy simulations on the desktop(2015-05); ; Dive deep into the fascinating world of real-time computational fluid dynamics. We present details of our GPU-accelerated flow solver for the simulation of non-linear violent flows in marine and coastal engineering. The solver, the efficient lattice boltzmann environment elbe, is accelerated with recent NVIDIA graphics hardware and allows for three-dimensional simulations of complex flows in or near real-time. Details of the very efficient numerical back end, the pre- And postprocessing tools and the integrated OpenGL visualizer tool will be discussed. Moreover, several applications with marine relevance demonstrate that elbe can be considered as prototype for next-generation CFD tools for simulation-based design (SBD) and interactive flow field monitoring on commodity hardware.Publicationtype: Conference Paper46