This study provides a quantitative analysis to investigate the effects of cough intensity and initial mucus thickness on transport clearance in mouth-to-trachea airway geometry using an experimentally validated Volume Fluid (VOF) based multiphase model. In addition, accuracy simplifying as Newtonian fluid is also quantified by comparisons efficiencies with simulations realistic shear-thinning n...

This second part of our research explores the kinematic aspect fine-scale bubble-induced turbulence (BIT) to (i) present effect bubble breakup and coalescence (ii) compare it against universal characteristics reported in literature. To this end, we simulate a dilute bubbly system 0.5% void fraction using two distinct numerical simulations. In volume-of-fluid (VoF) simulation, bubbles undergo co...

We devise a numerical method for passive advection of a surface, such as the interface between two incompressible fluids, across a computational mesh. The method is called isoAdvector, and is developed for general meshes consisting of arbitrary polyhedral cells. The algorithm is based on the volume of fluid (VOF) idea of calculating the volume of one of the fluids transported across the mesh fa...

In this paper a multi-disciplinary simulation of a capacitive droplet sensor based on an open plate capacitor as transducing element is presented. The numerical simulations are based on the finite volume method (FVM), including calculations of an electric field which changes according to the presence of a liquid droplet. The volume of fluid (VOF) method is applied for the simulation of the ejec...

Moonpool is an opening in the floor or base of a hull ship which can be used to lower tools and vehicles into the sea in a protected area. In this paper, the effect of a rectangular cross section moonpool on the resistance force of a supply vessel was investigated both by experimental and numerical methods. For both methods a 1:37.2 scale of Caspian3 surface vessel was used. Experiments were ca...

Stirred tanks are widely used in process industries for blending of singleand/or multiple-phase fluids, which often involves mass and/or heat transfer, chemical reactions, etc. Deep knowledge of flow field in the stirred tank is necessary to carry out these unit operations efficiently. As a result, extensive investigations of the flow in stirred tanks have been conducted over the past several d...

Fluid dynamics governed by Navier-Stokes equations is already solved for decades but the recent trend in computer graphics is to modify the simulation such that it easily controllable for the purpose of computer animation or real time fluid animation. In Eulerian approach, fields must be discretized in space, making these techniques inherently mesh-based. Each mesh cell represents an approximat...

We present a novel numerical method to solve the incompressible Navier-Stokes equations for two-phase flows with phase change. Separate phases are tracked using geometric Volume-Of-Fluid (VOF) piecewise linear interface construction (PLIC). Thermal energy advection is treated in conservative form and calculation of VOF fluxes at computational cell boundaries used consistently calculate heat cap...

There are different methods to reduce drag in high speed hulls. One of these methods is a change in the shape of the body by adding longitudinal side tunnels. In this paper it has been attempted to determine the influence of the tunnel height on hydrodynamic characteristics of the hull to achieving an optimum shape for the tunnel. To achieve this purpose, numerical simulation of the problem has...