The dam-break on granular-bed means the collapse of a static vertical water column on a rough moveable-bed. The purpose of this study was to determine the efficiency of analytical and volume of fluid (VOF) as Eulerian methods as well as moving particle semi-implicit (MPS) as Lagrangian method in predicting positive-wave behavior due to dam-break on granular substrates. The numerical simulations were implemented using commercial CFD-packages. While, in VOF method, the turbulence models, including Reynolds averaged Navier-Stokes (RANS), large eddy simulations (LES) as well as shallow-water equations (SWE) were used. The results of simulations of VOF method were compared against the results of the MPS particle-based method and the analytical solutions. Subsequently, the findings indicated that kinematic characteristics of dam-break wave and bed-scouring features are a function of initial height of water column of the reservoir as well as material characteristics. These kinematic properties include the height of the free surface profile, traveled distance by wave-front, the wave-front celerity and the surface-wave’ celerity. Likewise, scouring characteristic includes the depth of the sheet-flow, the depth of the bed-load and the minimum scouring depth of the floor. In this regard, material characteristics are roughness, specific density, diameter, friction angle, mobility and Shields’ parameter. Furthermore, MPS method has most efficiency in prediction of dam-break wave characteristics and bed-scouring features, among all computational methods. Moreover, only analytic methods can predict boundary-layer thickness of wave’ front tip-region and surface-wave’s celerity.
