Abstract This paper, aiming at the water-exit process of vehicle with cavitation, based on moving domain method coupled SDOF (six degrees freedom) solver, using VOF (volume fluid) multiphase model and Schnerr-Sauer cavitation model, carrying out numerical simulation research multi-conditions. Comparing vertical launch vehicles different Ca (cavitation number) cases, sudden decrease in number is...

in this paper, direct numerical simulation of two-phase incompressible gas-liquid flow for simulation of bubble motion in a microtube is presented. microtube radius is 10 µm. the interface is tracked using volume of fluid (vof) method with continuous surface force (csf) model. the flow is solved using a finite volume scheme, based on piso algorithm. numerical simulation is performed on a axisym...

Abstract A numerical simulation of the gas outflow to a closed region filled with liquid barrier disk was performed. The calculations were carried out using VOF method, supplemented by k-e turbulence model. Calculations performed for three cases 100, 200, and 300 mm distances from injector into water lead. pulsations axial pressure on obstacle investigated. It found that maximum during upper vo...

This paper focuses on the implementation, validation and exploitation of a vertical dropshaft flow operation using the commercial VOF-based Computational Fluid Dynamics (CFD) code, FLOW-3D ® . Using the experimental data of Chanson (2002), the package was used to simulate the flow patterns in a rectangular dropshaft with plunge-flow pattern. Both k−ε and k−ε RNG turbulence closures were tested ...

Water impact phenomenon of general bow section is a critical event for planning hulls. In this paper, the water entry of several arbitrary bow sections is investigated. For this purpose, arbitrary bow shapes which are introduced by Lewis form approximation are considered. In order to obtain pressure distribution and free surface profile, volume of fluid (VOF) method coupled with finite volume m...

In this study, a pellet scale model was developed for trickle bed reactor utilizing CFD techniques. Drag coefficients were calculated numerically at different velocities and bulk porosities in the case of single phase flow through the dry bed. The simulation results were then compared with the prediction of Kozeny-Carman (K-C) equation. The results indicated that drag coefficients calculated fr...

vof 3 other conditions will prove very useful for [l^ence. Therapeutic uses of lumbar puncture ^Renography of the ventriculo-subarachnoid space and t?L ?10chemiciil methods have also been dealt with, D increasing the practical utility of the volume, cmlmte facts have been presented in such a way that , can match with considerable accuracy the findings ,LPuractlcally any case. There is an excell...

The new Moment-of-Fluid (MoF) technique effectively overcomes the limitations of the VoF approach by utilizing more data: in addition to the volumes, the cell-wise material centroids (the first moments) are used. In [3] we presented the two-material MoF algorithm, which locates the linear interface in a mixed cell by minimizing the defect of the first moment over all the cell partitions that pr...

Direct numerical simulation of self-propelled swimming of three dimensional bionic fish and fish school in a viscous flow in a tank are investigated. The swimming rule and the profile of 3D fish from previous experimental measurements of living fish are used in the study. A parallel software package for the 3D moving boundary problem is obtained, which combines the adaptive multi-grid finite vo...