Strong oblique shock waves of granular flow are a steady-state solution formed when free-surface deflects around wedge-shaped obstacle at supercritical speed, but they do not usually occur because their formation requires specific conditions to be satisfied downstream the wave. This paper discusses method generating strong wave in laboratory experiment and numerical simulation. The is conducted...

The interaction of supercritical turbulent flows with granular sediment beds is challenging to study both experimentally and numerically; this task has hampered the advances in understanding antidunes, most characteristic bedform flows. This article presents first numerical attempt simulate upstream-migrating antidunes geometrically resolved particles a liquid-gas interface. Our simulations pro...

This study integrates a large eddy simulation (LES) model and volume of fluid (VOF) method to simulate the free-surface flows over inflexible circular-crested dams different shapes. The simulated water depths pressures on dam surface are validated by results laboratory experiments. Then numerical examines effects Reynolds number hydrodynamic force discharge coefficient. reveal that time-average...

We present a numerical study of a stabilization method for computing confined and free-surface flows of highly elastic viscoelastic fluids. In this approach, the constitutive equation based on the conformation tensor, which is used to define the viscoelastic model, is modified introducing an evolution equation for the square-root conformation tensor. Both confined and free-surface flows are con...

We describe a new class of surface flows, diffeomorphic surface flows, induced by restricting diffeomorphic flows of the ambient Euclidean space to a surface. Different from classical surface PDE flows such as mean curvature flow, diffeomorphic surface flows are solutions of integro-differential equations in a group of diffeomorphisms. They have the potential advantage of being both topology-in...

the purpose of this study is to investigate the relationship between free cash flows and stock return considering managers' myopia. two hypotheses have been designed and tested, selecting 96 firms from accepted companies in the tehran stock exchange for six-year period from 2005 to 2010 and using stock return for three years ahead (to 2012). the results show that free cash flows are negati...

We recall the PFS (Pressurized and Free Surface) model constructed for the modeling of unsteady mixed flows in closed water pipes where transition points between the free surface and pressurized flow are treated as a free boundary associated to a discontinuity of the gradient of pressure. Then we present a numerical kinetic scheme for the computations of unsteady mixed flows in closed water pip...

We use various nonlinear partial differential equations to efficiently solve several surface modelling problems, including surface blending, N-sided hole filling and free-form surface fitting. The nonlinear equations used include two second order flows, two fourth order flows and two sixth order flows. These nonlinear equations are discretized based on discrete differential geometry operators. ...

Mathematical and numerical aspects of free surface flows are investigated. On one hand, the mathematical analysis of some free surface flows is considered. A model problem in one space dimension is first investigated. The Burgers equation with diffusion has to be solved on a space interval with one free extremity. This extremity is unknown and moves in time. An ordinary differential equation fo...