Computational Fluid Dynamics Simulation about Comparison of Different Forms of Return Air in a Small Cold Store

2012 ◽  
Vol 516-517 ◽  
pp. 1133-1138 ◽  
Author(s):  
Yi Tang ◽  
Jing Xie ◽  
Jin Feng Wang ◽  
Chen Miao ◽  
Yi Zheng
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Computational Fluid Dynamics ◽  
Flow Field ◽  
Finite Volume Methods ◽  
Dynamics Simulation ◽  
Wall Function ◽  
Computational Fluid Dynamics Simulation ◽  
Cold Store ◽  
Simulation Results

The quantity of the cold store in our country has been rapidly rising since the 1990s, however, the flow field in the cold store is difficult to obtain accurately by experiments. With reference to the experiences in previous numerical simulations in this paper, CFD is used for analyzing two forms of return air in the cold store with the Finite Volume Methods and the SIMPLE Revised. As a result, Combining with the non-equilibrium wall function, it is found that taking the way of return air on both sides of the fan is more reasonable and the cooling consumption of the empty cold store can be saved before the products enter the cold store. Furthermore, the numerical simulation results can provide reference for choosing fans in the small cold store.

Research Progress of Simulation on the Flow Field in Anaerobic Reactor

2014 ◽  
Vol 955-959 ◽  
pp. 2098-2101
Author(s):  
Qin Zhang ◽  
Qiang Li ◽  
Jia Tang
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Computational Fluid Dynamics ◽  
Wastewater Treatment ◽  
Flow Field ◽  
Treatment Effect ◽  
Dynamics Simulation ◽  
Research Progress ◽  
Computational Fluid Dynamics Simulation ◽  
Anaerobic Reactor

The flow field in anaerobic reactor is very complex, but it has been given wide attention because of its important impact to wastewater treatment effect. It is often studied by numerical simulation. The paper explored the research progress of simulation on the flow field in anaerobic reactor by the summary of development of anaerobic reactor and principle and characteristics of computational fluid dynamics simulation and introduction of study and application status on numerical simulation. And then it gave its opinion on the development of simulation on the flow field in anaerobic reactor in future.

Numerical Simulation of the Inner Flow Field and the Optimal Design of Hema-Type ATY Nozzle Based on Fluent

2013 ◽  
Vol 634-638 ◽  
pp. 3774-3777
Author(s):  
Min Hua Zhang ◽  
Hong Mei Zheng ◽  
Cui Liu ◽  
Yin Hu Qu ◽  
Tao Liang ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Computational Fluid Dynamics ◽  
Optimal Design ◽  
Flow Field ◽  
Flow Fields ◽  
Fluent Software ◽  
Simulation Results

the inner flow fields of twelve Hema-type ATY nozzles which have different structure and parameters are simulated by the Fluent software, which is based on the CFD (Computational Fluid Dynamics) theory.Then the simulation results are analyzed，through wich the best designed nozzle is determined.

Three-dimensional computational fluid dynamics simulation of valve-induced water hammer

2016 ◽  
Vol 231 (12) ◽  
pp. 2263-2274 ◽  
Author(s):  
Shuai Yang ◽  
Dazhuan Wu ◽  
Zhounian Lai ◽  
Tao Du
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Method Of Characteristics ◽  
Three Dimensional ◽  
Water Hammer ◽  
Dynamics Simulation ◽  
Computational Fluid Dynamics Simulation ◽  
Time Step ◽  
Obvious Effect ◽  
Simulation Results

In this study, three-dimensional computational fluid dynamics simulation was adopted to evaluate the valve-induced water hammer phenomena in a typical tank-pipeline-valve-tank system. Meanwhile, one-dimensional analysis based on method of characteristics was also used for comparison and reference. As for the computational fluid dynamics model, the water hammer event was successfully simulated by using the sliding mesh technology and considering water compressibility. The key factors affecting simulation results were investigated in detail. It is found that the size of time step has an obvious effect on the attenuation of the wave and there exists a best time step. The obtained simulation results have a good agreement with the experimental data, which shows an unquestionable advantage over the method of characteristics calculation in predicting valve-induced water hammer. In addition, the computational fluid dynamics simulation can also provide a visualization of the pressure and flow evolutions during the transient process.

Computational Fluid Dynamics Simulation of Influence of Different Intervals of Product to the Huge Cold Store

2013 ◽  
Vol 740 ◽  
pp. 226-231
Author(s):  
Jing Xie ◽  
Chen Miao ◽  
Yi Tang ◽  
Jin Feng Wang ◽  
Yue Zhao
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Air Flow ◽  
Vertical Direction ◽  
Flow Distribution ◽  
Experimental Methods ◽  
Dynamics Simulation ◽  
Computational Fluid Dynamics Simulation ◽  
Cold Store ◽  
Better Than

The cold store has developed rapidly since 1990s in China. The unreasonable air flow distribution in cold stores hasn't been solved effectually because of lacking of experimental methods. The uniform air flied can improve the effect of store and save the refrigeration cost in the store. In this article, the air flow distribution was simulated with different intervals between products in a huge commercial cold store based on the previous simulation and experimental experience. The results showed that the interval of 10cm between products at vertical direction was better than that of 15cm for storage.

Numerical simulation and optimization of aerodynamic noise for claw pole alternator

2018 ◽  
Vol 233 (3) ◽  
pp. 857-879 ◽  
Author(s):  
Shuguang Zuo ◽  
Chaofeng Xie ◽  
Xudong Wu ◽  
Yuejiao Li ◽  
Kaijun Wei
Keyword(s):  
Fluid Dynamics ◽  
Finite Element Method ◽  
Computational Fluid Dynamics ◽  
Finite Element ◽  
Flow Field ◽  
Dynamics Simulation ◽  
Aerodynamic Noise ◽  
Computational Fluid Dynamics Simulation ◽  
Cooling Fan ◽  
Element Method

This study aims at minimizing the aerodynamic noise generated by claw pole alternator used in vehicles. In this paper, an effective and efficient hybrid test-analysis engineering approach has been proposed to predict and optimize acoustic performance of claw pole alternator. First, an experimental analysis was performed to predict the main components of the aerodynamic noise generated by the claw pole alternator. Then a hybrid approach was proposed to calculate the aerodynamic noise of the alternator. A computational fluid dynamics model of the claw pole alternator was developed for calculating the flow-field of the alternator. The pressure fluctuation in the flow field was analyzed to validate the computational fluid dynamics simulation. After the computational fluid dynamics simulation, the far-field aerodynamic noise generated by the flow field was calculated by adopting the acoustic finite element method. The accuracy and feasibility of the acoustic finite element model were validated with the experimental data. After the validation, the effects of the cooling fan parameters on the aerodynamic noise of the alternator were discussed and analyzed. According to the sound source information and the generation mechanism of the aerodynamic noise, the blade spacing angle of the cooling fan was optimized by establishing a theoretical model. The blade chord length of the cooling fan, the blade installation angle of the cooling fan and the tilt angle of the grille on end cap were optimized by structuring different surrogate models. After the optimizations, a significant reduction in the noise level of the claw pole alternator was found by the finite element method simulation. The overall sound power level has been decreased by about 6 dB (A).

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