小俣 哲平*1・本田 隆英*1



*1 技術センター 社会基盤技術研究部 水理研究室

Verification of Sloshing Simulation Using Moving Mesh with OpenFOAM

Teppei OMATA*1 and Takahide HONDA*1

When analyzing sloshing problems in CFD simulation, the seismic acceleration is generally applied as the acceleration acting on the fluid. However, in this calculation method, since seismic displacement is not applied to the tank itself, the conditions differ from the actual phenomena, and some problems in the simulation may be caused depending on the conditions of the analyzed structure. In this study, sloshing simulation of a rectangular tank was performed using OpenFOAM, an open source CFD code. OpenFOAM has been recently improved to implement a moving mesh, which enables the tank itself to be directly oscillated in sloshing analysis. The calculation results using a moving mesh were compared with theoretical equations and previous numerical calculation results to verify the changes in water level and the accuracy of the pressure distribution acting on the tank wall. It was found that the results were generally in good agreement with the theoretical equations and past analysis, so it was concluded that the analysis method in which the displacements were input has sufficient accuracy. Moreover, the differences in analysis results between the acceleration input method and the displacement input method were verified for the variation in water level and the hydrodynamic pressure acting on the tank wall surfaces. From the results it was found that although there was no major difference in the analysis results for water level between the two methods, it was confirmed that for the pressure results, the displacement input method may underestimate the pressure.

Keywords: sloshing phenomena, OpenFOAM, numerical simulation, hydrodynamic pressure, seismic motions, STAR-CD

*1 Hydraulic Research Section, Infrastructure Technology Research Department, Taisei Advanced Center of Technology