SUMMARY The capability of the direct volume fluid method for describing surface dynamics a free two‐dimensional rising bubble is evaluated using quantities recently published benchmark. model equations are implemented in open source computational library OpenFOAM®. Here, main ingredient numerical so‐called compression that corrects fluxes near interface between two phases. application this with respect to test cases benchmark considered part. differ physical properties, thus different...

In the present study two benchmark problems for turbulent dispersed particle-laden flow are investigated with computational fluid dynamics (CFD). How CFD programs OpenFOAM and ANSYS FLUENT model these flows is tested compared. The numerical results obtained Lagrangian–Eulerian (LE) point-particle (PP) models Reynolds-averaged Navier–Stokes (RANS) simulations of in steady state transient modes compared experimental data available literature. effect dispersion on particle motion particular, as...

Simulations of spray breakup are challenging due to a wide range different length and time scales. While Volume-of-Fluid (VoF) is suited for the primary breakup, secondary dilute cloud better resolved using Lagrangian particle tracking (LPT) method. This publication proposes 3D coupling between both models CFD software OpenFOAM resolve complete process atomization. Combined with adaptive mesh refinement, computational cost can be reduced significantly. The simulation fuel jet in crossflow...

Several air sampling studies have been conducted to assess the risk of airborne transmission since outbreak SARS-CoV-2 in late 2019. However, differences sampler positioning and positive collection results more distant locations suggest an interaction between indoor flow, altering aerosol distribution. This study aims investigate this influence by studying multiple collector positions, patient exhalation modes, two ventilation setups a 3D simulation model using implicit large-eddy...

Acoustic data has long been harvested in fundamental voice investigations since it is easily obtained using a microphone. However, acoustic signals alone do not reveal much about the complex interplay between sound waves, structural surface mechanical vibrations, and fluid flow involved phonation. Available high speed imaging techniques have over past ten years provided wealth of information deformation superior larynx during Time-resolved images inner structure deformable soft tissues are...

In this paper we describe the open-source discrete element framework YADE and implementation of a new deformation engine. is highly expandable software package that allows simulation current industrial problems in field granular materials using particle-based numerical methods. The description compaction powders material like metal pellets now possible with pure simple approach modern DEM-framework. realized by expanding radius spherical particles, depending on their overlap, so volume kept constant.

Within this paper we present Part2Track, a MATLAB software package for the evaluation of 2D Particle Tracking Velocimetry (PTV) measurements. Part2Track is not only capable handling time resolved image series but also double frame sets, which are commonly recorded by standard PIV systems. The following work covers short description package's functionalities and performance analysis on synthetic images. In order to demonstrate capabilities realistic, experimental data, two test cases provided.

The article describes the adaption and properties of a model concrete for detailed flow studies. To adapt yield stress plastic viscosity to corresponding rheological real concrete, is made mixture glass beads non-Newtonian fluid. refractive index fluid adjusted by addition further constituent. are characterised measurements in rheometers. Finally, first exemplary results from experiments with presented, which give incipient impressions complex internal dynamics flowing concrete.

In this paper, the hydrodynamics of a bubble column is investigated numerically using discrete model, which tracks dispersed bubbles individually in liquid column. The model combined with volume fluid approach to account for proper free surface boundary condition at liquid–gas interface. This improves describing backflow region, takes place close wall region. numerical simulation conducted by means open source computational dynamics library OpenFOAM®. order validate experimental results are...

The transient-free surface behavior in a model mold is evaluated numerically by performing the unsteady Reynolds-averaged Navier-Stokes (RANS) simulation and two-phase approach volume of fluid (VOF). Simulation conducted this study means open source computational dynamics library OpenFOAM®. calculations indicate effect nozzle depth jet velocity at port on free profile. Recent experimental results are used to validate contour gained from numerical simulations. A good overall agreement found...

A time resolving numerical model of single phase mold flows is formulated in the frame Reynolds-averaged Navier–Stokes (RANS) simulations. Three revised eddy viscosity turbulence models besides often used Standard k–ϵ for steady and unsteady RANS simulations are evaluated with computational fluid dynamics (CFD) software tool OpenFOAM. The performance different tested help mini-LIMMCAST facility. Numerical data compared experimental results focusing especially on jet flow region. lead to...

In the present article, performance and efficiency of ceramic filters for continuous steel filtration in an induction crucible furnace, which is part casting simulator facility located at Technische Universität Bergakademie Freiberg, investigated numerically. order to achieve this objective, a macro‐scale simulation melt flow coupled with pore‐scale inside filter that adequately resolved by its detailed geometry, obtained from computed tomography scan images. The considerable influence on...

A numerical model for the genetic optimization of volute a centrifugal compressor light commercial vehicles is presented. The cross-sectional shape represented by cubic B-splines and its control points are used as design variables. goal global to maximize average isentropic efficiency total pressure ratio at speed four operating points. consists density-based solver in combination with SST<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"...

With the recent increase in design of light and flexible structures, numerical investigations fluid structure together play a significant role most engineering applications. Therefore, current study presents an examination fluid-structure interaction involving structures. The problem is numerically solved by commercial software ANSYS-Workbench. Two-way coupled three-dimensional transient simulations are carried out for flaps different thicknesses glycerin laminar flow Reynolds number ranging...

A numerical model for the recirculating flow of an electromagnetically stirred iron melt in a cylindrical induction furnace crucible is presented. Due to parameters problem, full set magnetohydrodynamic equations decouples into magnetic and hydrodynamic parts. The diffusion approach vector potential describes part model. based on unsteady ensemble-averaged Navier–Stokes conjunction with Reynolds stress turbulence Such commonly termed averaged approach. Here influence electromagnetic field...