On the Applicability of Lattice Boltzmann Single-Phase Models for the Simulation of Wave Impact in LNG Tanks
- Micha Überrück (Hamburg University of Technology) | Christian F. Janßen (Hamburg University of Technology)
- Document ID
- International Society of Offshore and Polar Engineers
- International Journal of Offshore and Polar Engineering
- Publication Date
- December 2017
- Document Type
- Journal Paper
- 390 - 396
- 2017. The International Society of Offshore and Polar Engineers
- tank sloshing, LBM, impact pressure
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- 33 since 2007
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This contribution addresses the applicability of an efficient lattice Boltzmann-based single-phase free-surface model for the simulation of wave impact on the side walls of 2-D containers. The computational efficiency of the method is known to allow for very short turnaround times, but wave impact simulations have not been investigated in detail yet. Results for a selected wave impact case are discussed, the convergence behavior in space and time is analyzed, and limitations of the single-phase free-surface model are revealed. The results show that lattice Boltzmann method (LBM)-based single-phase free-surface models are a viable tool for predicting the impact wave behavior, but the quality of the pressure signal is limited, because of the absence of air in the simulations.
The efficient numerical simulation of violent tank sloshing and wave impact is important to many different fields of engineering. Besides the numerical accuracy of the employed solvers, the computational efficiency and the time to solution are of interest as well, as even two-dimensional simulations of tank sloshing require a substantial amount of computational time. In this context, a very efficient numerical methodology based on the lattice Boltzmann method (LBM) is assessed in this paper. The LBM is an alternative to conventional methods on the basis of the Navier–Stokes equations that offers solver-specific advantages in terms of data locality and parallel computing. The LBM usually operates on a finite difference grid, is explicit in time, and requires only next neighbor interaction. It is very suitable for implementation on graphics processing units (GPUs) and other high-performance computing (HPC) hardware. Recently published LB results comprise laminar and turbulent bulk flows, multiphase flows, and free-surface flow applications. For all applications, a comparably high computational performance on both CPU- and GPU-based parallel architectures is reported.
In the scope of this contribution, the applicability of the LBM to tank sloshing and wave impact is analyzed. Emphasis is given to the actual result accuracy, times to solution, and potential problems of the free-surface model. First, a short description of the LBM for bulk flows and the employed LBM free-surface model is given before addressing the violent tank sloshing case. Finally, conclusions are drawn and future perspectives are discussed.
|File Size||2 MB||Number of Pages||7|