This paper analyzes the liquid atomization mechanisms of an N-heptane spray jet emerging from a swirl simplex atomizer using numerical and experimental techniques. In particular, direct seamless coupled Volume Fluid Lagrangian Particle Tracking approach together with adaptive mesh refinement within Large Eddy Simulation framework offers suitable way to accurately simulate complex behavior atomization, evolution, droplet dispersion as whole while manageable computational cost. The achieved...

In this paper, we compare the capabilities of two open source near-wall-modeled large eddy simulation (NWM-LES) approaches regarding prediction accuracy, computational costs and ease use to predict complex turbulent flows relevant internal combustion (IC) engines. The applied tools are commonly used OpenFOAM, based on finite volume method (FVM), OpenLB, an implementation lattice Boltzmann (LBM). near-wall region is modeled by Musker equation coupled a van Driest damped Smagorinsky-Lilly...

In this work, entropy generation analysis is applied to characterize and optimize a turbulent impinging jet on heated solid surface. particular, the influence of plate inclinations Reynolds numbers heat fluid flow properties its impact thermodynamic performance such arrangements are numerically investigated. For purpose, novel model equations derived in frame Large Eddy Simulation (LES) that allows calculation local rates post-processing phase including effect unresolved subgrid-scale...

Abstract In order to sustain applications dealing with various liquid fuels in internal combustion engine (ICE), it is essential make available prediction methodologies that allow an early evaluation of the potential usefulness such terms favourable mixture preparation process already realistic configurations. Since air-mixture formation and subsequent processes are predominantly governed by fuel injection, a DNS based numerical investigation coupled VOF as interface tracking method carried...

In this work, near-wall thermal transport processes and entropy generation mechanisms in a turbulent jet impinging on 45 ∘ -inclined heated surface are investigated using direct numerical simulation (DNS). The objectives to analyze the subtle of heat vicinity an inclined impinged wall, determine causes irreversibilities that responsible for reduction performance impingement cooling applications provide comprehensive dataset model development validation. Results characteristics including...

The work presented in this study aims to understand the spray-wall-flow interaction within a gasoline direct-injection (GDI) engine flow bench under simulated early-injection conditions. Engine Combustion Network (ECN) Spray G injector is installed Darmstadt optically accessible bench. Under conditions, formation of multi-hole spray and with characteristic intake flows, such as jet central tumble flow, are extensively discussed. By reducing complexity number variables inherent whole-engine...

Apart from electric vehicles, most internal combustion (IC) engines are powered while burning petroleum-based fossil or alternative fuels after mixing with inducted air. Thereby the operations of and evolve in a turbulent flow environment created during intake phase then intensified by piston motion influenced shape chamber. In particular, swirl turbulence levels existing immediately before affect evolution these processes determine engine performance, noise pollutant emissions. Both...

A new high-frequency oscillating-hot-wire sensor for magnitude and direction measurements of the wall-shear stress in separated flows is presented. The determined from phase angle between imposed measured oscillation velocity, corresponding obtained low-pass filtered signal sensor, after removal modulating influence oscillation. was used to conduct downstream an axisymmetric backward-facing step (BFS) at different streamwise locations ranging 0.3 10 heights step. results agreed qualitatively...

In the present paper, direct numerical simulation (DNS) and particle image velocimetry (PIV) have been applied complementarily in order to generate a database of near-wall turbulence properties highly turbulent jet impinging on solid surface under different inclination angles. Thereby, main focus is placed an impingement angle 45 ∘ , since it represents good generic benchmark test case for wide range technical fluid flow applications. This specific configuration features very complex...

Abstract To study the effect of swirl intensity on picking speed wheat particles, a test bench for transportation status bulk grain particles was developed, and theoretical model transported by established. Firstly, critical conveying is determined through analysis budgeted using C&K model. Then, experiments are conducted to pick up loose in different flow fields. The swirling field gradually rolled from windward end sequentially pushed backwards be picked transported. shows trend first...

In this work, a large eddy simulation (LES) technique combined with entropy generation analysis (EGA) is employed in order to investigate the complex physics of fuel injection under supercritical conditions. particular, physical processes that are relevant for breakup and mixing identified their effects on overall disintegration process quantified. Thereby, it turned out (1) chain four consecutive (shearing, separation, pseudo-boiling, turbulent mixing) drive jet disintegration, (2)...

The states of milling tool are closely related to the quality workpieces under machining. A high product often implies surface finish and dimensional accuracy. Therefore, wear has be controlled. However, cannot measured continuously while machine is still in operation. Thus an alterative condition monitoring approach should adopted. parameters, e.g. electric current, vibrations, acoustic emissions, considered as indirect data data-driven health management technology they not directly with...

In this paper, advanced wall-modeled large eddy simulation (LES) techniques are used to predict conjugate heat transfer processes in turbulent channel flow. Thereby, the thermal energy process involves an interaction of conduction within a solid body and convection from surface by fluid motion. The approaches comprise two-layer RANS–LES approach (zonal LES), hybrid representative, so-called improved delayed detached method (IDDES) non-equilibrium wall function model (WFLES), respectively....

In the present work, heat transfer and fluid flow their effects on entropy generation in a realistic catalytic converter of Lada Niva 21214 vehicle are studied using large eddy simulation. At first, pressure drop over is measured for dry air at constant temperature (T=298 K), different volumetric rates, extrapolated to rates K) exhaust gas under engine conditions (T=900 Darcy–Forchheimer relation. Then, coupled phenomena inside analyzed nonreacting isothermal with conjugate by large-eddy The...

Abstract In this paper, a wall-adapted anisotropic heat flux model for large eddy simulations of complex engineering applications is proposed. First, the accuracy and physical consistency novel are testified turbulent heated channel flows with different fluid properties by comparing conventional isotropic models. Then, performance evaluated in case more flow situations that particular relevant internal combustion engines engine exhaust systems. For purpose strongly pipe flow, inclined jet...

This paper presents a novel way for structural dynamic simulation analysis on three-dimensional (3-D) finite element (FE) model of 6-DOF Manipulator using ANSYS Workbench 13.0 that allows integrated optimization. The load between driving and driven gear is delivered by elastic frictional contact, which leads to some non-liner contact problems, the problems are solved according FE parametric programming method. study particularly focused investigating static, dynamic, fatigue behaviors system...

The parameters of a wheat flour equal-pitch screw feeder are mainly based on empirical design. A method comparing the effect number blocked zones feeding sections is proposed to complete parameter four sections. According designed structure, Solid Works was used build three-dimensional model, and EDEM software imported for discrete element analysis. It found that optimal solution design with two zones, in which cutting stock very uniform high accuracy premise satisfying feeding. In order...