The application of a novel turbulent inflow generator is presented using a 3D Direct Numerical Simulation (DNS) method. For simulation the in-house 3D CFD program Free Surface 3D (FS3D) is applied, which solves the incompressible Navier Stokes Equations for flows with free surfaces using a Volume-of-Fluid (VOF) technique. Three different numerical setups are presented, demonstrating the wide ra...

A comparative performance analysis of the CFD platforms OpenFOAM and FLOW-3D is presented, focusing on a 3D swirling turbulent flow: a steady hydraulic jump at low Reynolds number. Turbulence is treated using RANS approach RNG k-ε. A Volume Of Fluid (VOF) method is used to track the airewater interface, consequently aeration is modeled using an EulerianeEulerian approach. Structured meshes of c...

Vapor-venting microchannel heat exchangers are promising because they address the problems of high pressure drop, flow instability, and local dryout that are common in conventional two-phase microchannel heat sinks. We present a 3D numerical simulation of the vapor-venting process in a rectangular microchannel bounded on one side by a hydrophobic porous membrane for phase-separation. The simula...

Abstract The paper presents numerical modelling of the liquid film spreading dynamics R21 (mol. fraction: 0.9) and R114 refrigerants mixture. We considered an outer flow along a round vertical cylinder at Reynolds number 104 various contact angles. simulation was performed in OpenFOAM software on basis volume fluid (VOF) method. have shown that wetting front deforms angles 30 50 degrees, regula...

Abstract CFD is a numerical approach used to solve fluid problems. In the simulation process, meshing stage crucial produce high accuracy. Meshing process where geometric space of an object broken down into many nodes translate physical components that occur while representing object’s shape. The research objective was analyze characteristics mesh technique in Finite Volume Method (FVM) using R...

Ink transfer process from the printing roll to the web was investigated using a Computational Fluid Dynamics (CFD) technique for the roll-to-roll (R2R) printing application. A parametric study was conducted to identify the effects of fluid parameters such as viscosity, surface tension and contact angle. To make the present analysis more relevant to the real printing system, a three-dimensional ...

in this paper, a two-dimensional reynolds averaged navier-stokes (rans) model is developed to simulate the shoaling, breaking and overtopping of a solitary wave over a vertical breakwater. turbulence intensity is described by using a k turbulence closure model and the free surface configuration is tracked by volume of fluid (vof) technique. to validate the numerical model the simulation result...

Abstract With the development of simulation technology and programs, it became necessary to study models that control equations’ solutions influence results. The having over solving equations multiple phases materials are investigated. They include (Volume Fluid (VOF), mixture, Eulerian) controlling governing equations. was conducted depending on boiling point water. activation these three is c...