Spur dike is a common hydraulic structure, which is widely used in hydraulic engineering such as channel regulation, flood prevention and river diversion for preserving the desired water depth, deflecting the main current and protecting river banks. In actual operations, spur dikes exert influence on river system usually in the form of groups, and the flow field around spur dike group is compli...

Based on the volume of fluid method (VOF), rising characteristics bubbles in near-wall static water are studied. In this study, influence wall motion bubble was studied by changing distance wall, diameter bubble, arrangement and size ratio, etc. The is expressed as average swing amplitude “Z”-shaped when rises. study found that case a single surface has certain rise its degree affected diameter...

In this paper, an HLLC-type contact preserving Riemann solver for incompressible two-phase flows using the artificial compressibility formulation is presented. This improvement over previous HLLC-VOF (Bhat and Mandal, 2019). work, unlike formulation, variation of volume fraction taken into account when calculating eigenvalues eigenvectors. Hence, equations intermediate states wave speed are clo...

Abstract. An in-house Navier-Stokes multiphase VOF (Volume-Of-Fluid) solver is used to study sloshing phenomena in a partially filled rectangular tank subjected vertical sinusoidal excitation. The flow dynamics found be significantly affected by acceleration and forcing frequency. Specifically, when the strong excitation frequency low, exhibits more chaotic three-dimensional nature. Consequentl...

A microchannel reactor improves the overall mass and heat transfer as compared with a conventional reactor. This is attributed to creation of high area-to-volume ratio enhanced mixing due presence vortices inside slug. In this paper, mass-transfer performance was studied using cross-junction microchannel. Subsequently, computational fluid dynamic (CFD) method used observe oil concentration cont...

The paper describes a coupling of the geometric Volume-of-Fluid (VOF) method with sharp-interface phase-change model for Cartesian and axisymmetric grids. Both interfacial position temperature field are resolved subgrid accuracy. Species transport implicit diffusion is considered in gas phase. numerical implementation developed here described detail, as well its incompressible Navier-Stokes sol...

This paper presents numerical simulations of two-phase flow with highdensity ratio, taking into account mass transport of a soluble component and its interfacial mass transfer. The mathematical model and the numerical method allow for different solubility of the species in the respective fluid phases, while volume changes due to mass transfer are neglected. The discontinuous changes in species ...

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Cavitation is among the most complicated and common damages of spillway structures. This phenomenon is controlled by different parameters including the pressure, flow velocity, spillway surface material, operation time, and air flow content. The cavitation index is calculated along the spillway and compared with its critical value using the measured values of the flow’s hydraulic parameters. Th...

As a step towards addressing scarcity of references on this topic, we compared the Eulerian and Lagrangian Computational Fluid Dynamics (CFD) approaches for solution free-surface Fluid–Solid Interaction (FSI) problems. The approach uses Finite Element Method (FEM) to spatially discretize Navier–Stokes equations. free surface is handled via volume-of-fluid (VOF) level-set (LS) equations; an Imme...