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Bridge pier scour was simulated by a coupled fully 3D hydro-morphodynamic model and validated against 24 experimental datasets for a combination of different pier shapes, approach velocities and se...

Particle‐particle interaction forces due to simple shear motion of particles relative to each other are investigated. The particle‐particle interaction force originates from the force balance equations derived for a single particle and extended to the group. A closed form is obtained using a combined collision sphere and REV approach. Rewriting in terms of a particle viscosity and rate of strain yields an expression which is similar to that proposed by [1].

Current models used for the simulation of two‐phase flows in coastal dynamics make extensive use of empirical data. The main focus of this investigation is to develop models for specific aspects of two‐phase flows that are based on physical principles in order to reduce the use of such data. In this study several existing empirically based drag force models are discussed. The motion of spherical or near‐spherical solid particles through a Newtonian fluid is investigated and a new method for the closure of the drag force, using a Representative Unit Cell is discussed and compared to the existing models as well as experimental data. The various drag models were also evaluated by numerical simulations, using an in‐house developed program based on an adaptation of the SIMPLE procedure.