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3D Numerical Simulation of the Process of Draining into a Lock Minghua Deng1,2,a, Zhu Gao3,b*, Dawei Mao4,5,c 1College of Hydrology and Water Resources, Hohai University, Nanjing, China 2Hydraulic Engineering Bureau of Dongting Lake, Changsha, China 3College of Hydraulic and Environmental Engineering, China Three Gorges University, China 4Nanyang Technological University, Singapore 5SINTEF Rock Engineering, Trondheim, Norway adengminghua@hnwr.gov.cn, bgaozhu.cn@gmail.com, cdawei.mao@sintef.no Keywords: Lock; Numerical simulation; Draining Abstract.
By CFD, a more precise estimation of the draining time and abundant details about the draining process were obtained.
Comparisons were also done between the SIM and CFD method.
Two approaches of SIM and CFD are given in the following paragraphs respectively.
While in the CFD approach, the fluctuations of water surface and inertia effect are considered and computed, so a longer time of about 42.1s is the solution for this problem.

The simulation analysis results will be compared and validated by practical spray coating experiment, so as to determine the reliability of simulation to implement the spray flow field simulation technique for large area uniform spray coating.
This study uses computational fluid dynamics (CFD) software to analyze the spray characteristic on the flow field distribution and flat plate coating in the case of fixed ultrasonic vibrator, vibration wave and array ultrasonic nozzle arrangement.
The simulation analysis results will be compared and validated by practical spray coating experiment to determine the reliability of simulation, and to implement the spray flow field simulation technique for large area uniform spray coating.
Research Methods This study uses three-dimensional CFD, finite volume method and SIMPLE algorithm and first order upwind difference method for numerical analysis, and uses standard turbulence model for related simulation calculation.
Point-6 31.53 26.107 20.77% 31.49 28.255 11.45% Point-7 29.26 26.002 12.53% 28.84 30.474 5.36% Point-8 31.39 24.834 26.40% 31.36 27.883 12.47% Point-9 31.96 *** 0.00% 32.16 27.679 16.19% Average value 31.7 25.51 24.28% 32.42 27.36 18.89% *** SEM fails in measurement Conclusion This study aims at the influence of the parameters of ultrasonic nozzle height, substrate traveling speed and PITCH on the spray coating film thickness distribution in the array ultrasonic atomization spray coating process equipment technology, and uses CFD computer simulation analysis technique and compares atomization flow field prediction simulation analysis result with real machine test, to build a reliable computer simulation analysis model for array ultrasonic atomization spray coating process.

Differences in the Design of Underfloor Air Cavities Tomáš Renčko1,a* and Anna Sedláková1,b 1Technical University of Košice, Civil Engineering Faculty, Vysokošlská 4, 042 00 Košice, Slovakia atomas.rencko@tuke.sk, banna.sedlakova@tuke.sk Keywords: underfloor ventilation, concrete slab, shaped unit, CFD simulation, experiment Abstract.
In this article two different underfloor ventilation systems are compared using CFD simulation.
CFD Simulations ANSYS CFX [14] is used to assess the underfloor ventilation model examples.
Summary The paper aims to highlight the possibilities of CFD computer simulation programs to assess airflow in underfloor cavities.
Šikula: CFD simulation of ventilated air cavity.

This paper aims to investigate the particle dynamic behavior in a rotating drum with flights, based on CFD and experimental results.
CFD simulations In the present work, the Eulerian–Eulerian multiphase model along with the kinetic theory of granular flow was used in the simulation study.
The simulations were performed using the software FLUENT® 14.0.
Fig. 1 – Example of particle volume concentration distribution over the drum cross-section obtained by CFD simulation.
The results showed a good agreement between experimental data and CFD simulations.

We used CFD method to numerical simulation of solid-liquid two-phase flow in nozzle flow inside the nozzle, simplified structure, used the RNGk- ε model for numerical simulation.
This essay uses CFD technology to do the numerical simulation of flow field in the nozzle and research the law and reason of wear, providing the basis for engineering application and structure optimization.
Use the Fluent software, we do numerical simulation, controlling the error under 1×10-5.
Summary Using the method of CFD can do the numerical simulation of the nozzle’s erosion condition in a certain degree, and it is easy to analyze the parts which gets abraded easily and the degree of wear.
，Numerical Simulation of Erosion and Particle Motion Trajectory in Centrifugal Pump [J].

Numerical Simulation of Tire Hydroplaning and its Influencing Factors ZHOU Hai-chao*, Wang Guo-lin, YANG Jian and Xue Kai-Xin School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang, 212013, China *Email: haichaozhou999@163.com Key words: tire hydroplaning; CFD; hydrodynamic pressure; numerical simulation Abstract.
Aksenov et al.[2] presented a three-dimensional simulation of the interaction between tire and free surface flow by virtual of Computational Fluid Dynamics (CFD) technology, but the deformation of tire surface was ignored and the computational domain remained fixed in time in his work.
Simulation results may vary by about 5%-10% with the computation domain size.
It is showed that CFD is an efficient tool in calculating and analyzing tire hydroplaning.
Numerical Simulation of Car Tire Aquaplaning[C].

Characteristic parameters are proposed as transient flow and heat transfer parameters from in-cylinder CFD simulation, with further consideration of the influence of thermal conductivity, viscosity and Prandtl number.
Characteristic parameters are proposed as transient flow and heat transfer parameters from in-cylinder CFD simulation.
So, we try to get the results of and from the in-cylinder simulation.
In this example, with single CPU, simulation time increases 15 minutes.
Characteristic parameters of the new model are proposed as transient flow and heat transfer parameters from in-cylinder CFD simulation.

The Simulations are carried out using commercial CFD code ANSYS Fluent 13.
The Simulations are carried out using commercial CFD code ANSYS Fluent 13.
Meshing is probably the most important and complex part of a computational simulation.
Boundary Conditions and Convergence Criteria Simulations are carried out using commercial CFD code ANSYS Fluent 13.
Stern, CFD calculations of sinkage and trim, J.

Secondly, the thermal control measure is optimized with the method that consists of CFD simulations and experiments.
Using Ansys CFD simulation[5] software package, a thermal analysis including heat conduction and convection is taken.
Fig.2 CFD simulation model 4 different simulations are taken to get the most ideal thermal control: temperature in measuring head can stably reach a value of above -10 degrees; temperature gradient in steel drum stays as small as possible; electric consumption must be less than 100W.
a).1st simulation b).2nd simulation c).3rd simulation d).4th simulation Fig.3 4 simulation results The comparison of results in Fig.3 is shown as table.1.
Table.2 Comparison of simulation 4 and simulation experiment Temperature of measuring head[] Temperature of steel drum[] Power consumption[W] Simulation 4 -2~-2.9 -63~-52 15.7 Simulation experiment 0,5 -72,-70 18.3 Table.2 says simulation experiment result agrees with the simulation.

This CFD aerodynamic analysis utilized ANSYS Fluent software package.
The flow over the car surfaces was modelled with the non-equilibrium wall functions as the near-wall treatment, as it provides more realistic simulation of the behaviour of turbulent boundary layers including flow separation [6].
The simulation air velocities were at the velocity-inlet boundary.
The bottom of the domain is set as “No Slip Wall”, and the top and the sides of the domain are set as “Symmetry” so that these surfaces would not bring any effects on the simulation.
Baškarić.CFD Analysis of concept car in order to improve Aerodynamics.