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A CFD Simulation of Indoor Natural Ventilation of a Residential District In Zhuzhou Zhiyong Wang1,a, Shunfu Yang1,b*, Changrong Liu1, Tianyu Zhang1, Na Cui1 1School of Civil Engineering, Hunan University of Technology, Zhuzhou, Hunan, China, 412007 azywang668@126.com, bford_young@163.com Keywords: natural ventilation; CFD; numerical simulation; residential district Abstract.
Computational fluid dynamics (CFD) get rapid development in recent 20 years, especially in architectural design.
This text established a model of part of a residential district in Zhuzhou based upon ANSYS FLUENT CFD software, and used numerical simulation method to simulate the condition of indoor natural ventilation under typical summer climate when the doors and windows of buildings were opened.
A simulation of indoor natural ventilation and thermal comfort based on CFD.
Analysis of computational fluid dynamics—Principle and application of CFD software.

Cfd. hydraulic condition.
Numerical simulation.
The results indicate that k, ε can reasonably explain flocculation effect, and meanwhile verify the better applicability as the CFD numerical simulation evaluation indexes of flocculation effect.
The results indicate that k, ε can reasonably explain flocculation effect, and meanwhile verify the better applicability as the CFD numerical simulation evaluation indexes of flocculation effect.
Kostoglou ,A CFD-based simulation study of a large scale flocculation tank for potable water treatment.

Then, experiments were carried out in a spinning disk test rig with variable speed of spinning and results were compared with CFD simulation.
Hydrodynamics Modeling Using CFD Assumptions were made during simulation of the flow of thin liquid film over horizontal spinning disk.
Table 1 summarizes values of model parameters and conditions applied for the CFD simulation.
The comparison results of thin liquid film thickness across the radial position of disk surface between experimental and CFD simulation are shown in Figure 4 and 5.
Generally, the profiles of thin liquid film thickness from the experimental and CFD simulation results showed similar changes where thinning effect of liquid film in radial location can clearly observe.

The results obtained by CFD simulation are validated with experimental results.
The various stages performed in CFD simulation of Solar PV/T panel are geometric modelling, meshing or grid generation, setup and solution and results. 1.
It is designed to enable easy visualization and quantitative analysis of the results of CFD simulations.
The experiment is carried out from 8 am to 5 pm and readings are noted in 1 hour interval and the individual CFD simulation at each hour is also carried out for the corresponding inputs at that time.
Although there are some small discrepancies due to some assumptions and meshing imperfectness matters, the CFD simulation program can be confidently used even for solving more complex solar PV/T problems.

CFD Simulation of Pyrolysis of Lignite in a Downstream Fluidized Bed Yongli Sun1, a, Rong Zhang1, b, Lvhong Zhang1, c and Yanan Zhang1, d 1School of Chemical Engineering and Technology, Tianjin University,Tianjin, China asunyongli@tju.edu.cn, bzhangr1988@sina.cn, czhanglvh@tju.edu.cn, dzyn820109@163.com Keywords: CFD simulation; lignite particle; pyrolysis; fluidized bed Abstract.
This paper works with the CFD simulation of the process of pyrolysis of lignite particles in a downstream fluidized bed, which actually means the particles would fall down from the injection point and escape the furnace from the bottom.
Introduction Several models which can be applied to the simulation of the process of pyrolysis have been developed by numbers of researchers [1-9].
The parameters used in the simulation are given in the Table. 2.
[2] K.Papadikis, S.Gu, A.V.Bridgwater and H.Gerhauser: Application of CFD to model fast pyrolysis of biomass, Fuel Processing Technology 90 (2009) 504-512

Use of CFD simulation to measure the effects of floor plan shape and building height on pedestrian wind comfort and wind safety Dagmara Čeheľová1,a, Milan Janák2,b and Boris Bielek1,c 1Department of Building Structures, Slovak University of Technology in Bratislava, Faculty of Civil Engineering, Radlinského 11, 813 68 Bratislava, Slovakia 2Simulácie budov, s.r.o., Hanulova č. 9, 841 01 Bratislava, Slovakia adagmara.cehelova@stuba.sk, bjanak@simulaciebudov.sk, cboris.bielek@stuba.sk Keywords: CFD simulation, pedestrian wind comfort, pedestrian safety, computational grid Abstract.
The rapid development of computer technology, especially computer performance, enabled significant development of CFD simulations.
Nowadays advanced computer technology, have CFD simulations in the construction sector irreplaceable position in determining the impact of wind on buildings and people.
CFD simulations are nowadays the preferred method for determining the effects of wind on buildings and pedestrian, especially in the pre-project phase.
References [1] JANSSEN, W. - BLOCKEN, B. - VAN HOOF, T.: Use of CFD simulations to improve the pedestrian wind comfort around a high-rise building in a complex urban area.

After simplified model, CFD can be used in the simulation of the biological reactors.
A recent study of CFD model, used two-phase (air and liquid) and three-phase (air, liquid and solid) flow for three-dimensional MBR simulation [9].
The CFD simulation of ALOD is verified by particle dynamic analyzer experiment (PDA).
Meroney and Colorado used a small anaerobic digester reactor to study the tiny differences of CFD simulation between different CSTR systems [16].
CFD simulation is mainly used for basic process, but rarely involves the variation process.

CFD Simulation and Computation of Pressure Loss of Resistance Muffler Jiawei Ren 1, a, Qinyu Jiang1, b and Zhen Wang*1, c 1College of Mechanical Engineering,Dalian University, Dalian, Liaoning, 116622, China arenjiawei005@163.com, bwangzhen@dlu.edu.cn, cwangzhen@dlu.edu.cn *Corresponding Author: Zhen Wang Keywords: resistance muffler; computational fluid dynamics; pressure loss; numerical simulation Abstract: Computational fluid dynamics (CFD) software was used to simulate the internal flow field of an example muffler, and compared the results with the experimental data, verifying the reliability of the simulation algorithm.
Simulation of the example muffler In order to verify the reliability of the simulation algorithm, the CFD software Fluent was used to simulate the internal flow field of an example muffler, and compared the results of software simulation with the experimental data, paved the way to using Fluent software to simulate different structural mufflers.
The Resistance Muffler Study based on CFD Simulation and Test.Shandong University,2007.
Computational Fluid Dynamics Analtsis-CFD Software Principles and Applications.
Fluent12 Fluid Analysis and Engineering Simulation.

Investigation of CFD method simulating hydrodynamic performance of AUV with complicated shape WANG Yaxing1,a, PANG Yongjie1, GAO Ting1, Wang Jian1 1 Science and Technology on Underwater Vehicle Laboratory, Harbin Engineering University, Harbin, 150001, China awang-yaxing@hrbeu.edu.cn Keywords: PMM; AUV; CFD Abstract: Analyze veracity and computing efficiency of direct route drag of axis symmetry revolution body with 2D Computer Fluid Dynamic (CFD) method by comparing to the experiment data, discuss affection of different wall boundary functions to the results when calculating Automatic Underwater Vehicles (AUVs) hydrodynamic performance in CFD method.
CFD simulation of direct or oblique towing test Steady RANS equations could be adopted to calculate force and moment of AUV when simulating direct, or oblique, towing test, because relative motion does not happen.
Force calculation of non-revolution body and ordinary AUV. 2D method could not be applied to simulation of non-revolution body and ordinary AUV, however, most AUVs are bilateral symmetry, half of a fluid field could be meshed to do the simulation, this is also a good method to save time.
Fig 4 Layer mesh Heave and pitch simulation with CFD method Mesh law.
Comparison of simulation results.

Studies have shown that combining with the specific engineering practice, the application of CFD on the flow field simulation has a certain reference value for the design and optimization of the sweeper airstream system.
Fig.5 The improved model of airstream system Fig.6 Contour of static pressure in new model Summary According to this engineering practice, the numerical simulation is successfully completed by the use of CFD.
The simulation analysis by CFD should be combined with the actual characteristics of the project; additionally the related experiments and numerical simulations should be unified.
Xu: Journal of System simulation, Vol.16 (2004), p. 2770
Zeng: Journalof System simulation, Vol16 (2004), p.270