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Performance Study of Storage-type Domestic Electrical Water-Heaters with Wedged Inlet: Unsteady Water Discharge Rate Zhijun Zhanga, Shiwei Zhangb, Chenghai Xuc School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110004, China azhjzhang@mail.neu.edu.cn, bshwzhang@mail.neu.edu.cn, cxch1940@126.com Keywords: Electric Water heater, utility efficiency, unsteady discharge rate, CFD, simulation Abstract: The unsteady water discharge rate on performance of storage-type domestic electrical water-heaters with wedged inlet was studied by computer fluid dynamics simulation (CFD).
The objective of this investigation is to examine the effect of unsteady water discharge rates on performance of domestic EWHs with wedged inlet by CFD simulation method that was not studied by Adel A.
Simulation Procedure Water was discharged from the storage tank of the EWH with the steady draw rate () 5L/min.
Each simulation lasts three times the mean residence time (), where (8) Performance Estimate Estimate Parameter.

Computational Fluid Dynamics (CFD) simulation is expected to give detailed flow information which is important for stirred reactor design and optimization, however accurate flow prediction remains a challenge for CFD application.
As the development of computer technology, Computational Fluid Dynamics (CFD) provides a useful tool for the investigation of hydrodynamic inside the stirred reactors and can reveal a lot information which cannot be obtained merely using experimental approaches.
By defining the fluid properties arbitrarily, both Newtonian [8] and Non-newtonian fluid [9] could be studied in the CFD investigations.
However, there are also some challenges for CFD applications, one of which is accurate prediction of flow quantities such as turbulence kinetic energy distributions, etc.

Conventional dynamic derivative calculation method is through CFD simulation of micro aircraft forced harmonic vibration amplitude.
Calculated using frequency-domain dynamic derivative characteristics: (1) Calculated using the frequency-domain dynamic systems greatly reduce the computational overhead often cyclical unsteady CFD simulations.
Derivative of the unsteady horizon include forced harmonic vibration simulation method and free vibration simulation method.
Although compared with frequency domain method, time domain simulation is more accurate, but the large amount of calculation, the unsteady computational efficiency become the bottleneck of CFD application in dynamic derivative.
In the time domain simulation of the unsteady calculation efficiency problem, derivative efficient computing method of the further development of research, large-scale parallel CFD technology research and accelerating convergence technology research are needed.

The simulation results show that there are two low pressure regions and two regions of high volume fraction of steam in angle nozzle.
Numerical simulation is a new method of research on flow field, which develop with the improvement of computer technology[8].
Take a kind of typical cavitating nozzle, namely angle nozzle as research object, the flow field inside nozzle were simulated on the basis of advanced CFD software¾¾fluent.
The mixture model, RNG model and cavitation model were used in simulation.
Governing Equations of Cavitation Model In CFD software fluent 6.3 used in this paper, the cavitation model is Singhal complete cavitation model.

The structure parameters of the guide-vane will be optimized from the simulation results.
Fig.1 Configuration of flowmeter Fig.2 Specimen of guide-vane Fig.3 1/6 simulation model Simulation model As to the flow of high Reynolds number, the flow is partitioned into two parts[9].
The simulation medium is water at 20°C.
Simulation and analysis Performances of Different Front Oriented-Body.
During the simulation of CFD, the steady-vane is not supposed as the thin plane.

By solving the granular flow field for the pressure and velocity distribution on a given geometry using a general purpose computational fluid dynamics (CFD) code, we were able to analyse changes in surface roughness distribution from the process equation.
The immobilized cylinders were submerged in the top portion of the media flow field so as to facilitate comparison between media flow past the workpieces as experimentally observed and as predicted by the CFD simulations.
A granular flow dynamics model as well as the workpiece geometry were inputed into a CFD software package in order to calculate the pressure and velocity field.
The model and workpiece geometry were inputed into ANSYS CFX v. 12, a general purpose CFD package; and the pressure and velocity field calculated accordingly.
Tay, "Process modelling and simulation of vibratory finishing of fixtured components", Proc. of the 10th EUSPEN (European Society for Precision Engineering and Nanotechnology) Conf vol. 2, pp. 269-273.

On the Use of CFD in Thermal Analysis of Industrial Hollow Ceramic Brick M.
CFD is one of the most appropriate tools to raise the knowledge about the fluid flow, as well as the temperature and moisture fields in the drying systems, as shown by Khan and Straatman [4], that demonstrated the ability to propose a formulation for precise numerical simulation of a convective drying process in porous materials.
Both geometry and mesh were constructed using ICEM CFD 15.0 software.
The simulations were performed using commercial software ANSYS CFX 15.0.
The following simulation times and time step were adopted

Numerical simulation of flow field and flow noise was carried out on SUBOFF with Lighthill acoustical analogy and large eddy simulation method.
Numerical simulation of flow field and flow noise was carried out on SUBOFF with Lighthill acoustical analogy and large eddy simulation method.
Table1 Drag Force for SOBOFF v[m/s] CFD [N] Experiment [N] Relative Error% 3.048 106.07 102.3 3.69 The simulation results of flow field are relatively accurate which can be seen from above.
It also shows that the CFD results agreed well with the experimental results.The result of flow noise is shown in Fig.1.
Through the numerical simulation of flow field and flow noise for 6 kinds of model in different angle of attack, we can draw the following conclusions. 1) CFD method was used in the simulation of characteristics of flow field.

AA*2=1M22κ+11+κ-12M2κ+1κ-1 (1) Because the area-Mach number relation is valid only for (ideal) isentropic flow, 2D and 3D simulations with the commercial CFD solver Star CCM+ from CDAdapco were performed in order to include the viscous effects from the nozzle walls.
In Fig. 2, the Mach number distribution along the x-Axis for the 1D area-Mach number relation and the 2D and 3D CFD simulations are plotted, where the throat is at x=0.
Near the throat -0.1CFD simulations.
To verify the isentropic mass flow rate equation, CFD simulations with two different settling chamber pressures were performed.
In Fig. 4 and Fig. 5 the CFD solution for the different settling chamber pressures are shown.

The Influence of Micro-texturing Dimple on the Bearing Capacity of the Elastohydrodynamic Lubrication Based on CFD-FSI Fluid-solid Coupling Jiang Liu1, a, Huixia Liu1, b, Jian Li1, Shilin Feng1, Tianyu Wang1, Xiao Wang1, c 1School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China aliujiang1163@163.com, blhx@ujs.edu.cn, cwx@ujs.edu.cn Keywords: EHL, CFD-FSI, Smooth surface, Micro-texturing dimple surface, The equivalent elastohydrodynamic lubrication model, The minimum film thickness, Numerical analysis Abstract.
Until the appearance of CFD-FSI based on fluid-solid coupling method, it makes the use of this method to solve the elastohydrodynamic lubrication problem possible.
From 2010 to 2013, Dai [5] and Kong [6] analyzed the smooth surface water lubricated bearings based on the CFD-FSI fluid-solid coupled method, and the result meets their expectations.
The commercial software FSI module in ADINA can put all the functions of ADINA-CFD and ADINA-Structure together, and realize the coupling analysis of the fluid and the structure [7].
Dai: Research on Fluid-structure Interaction Simulation and Structure Optimization of Mater-lubricated Stern Tube Bearings.