Numerical Study of the Airflow Distribution in a Passenger Car Cabin Validated with PIV

2019 ◽  
pp. 457-467
Author(s):  
Sebastian Ullrich ◽  
Ricardo Buder ◽  
Nesrine Boughanmi ◽  
Christian Friebe ◽  
Claus Wagner
Keyword(s):  
Numerical Study ◽  
Passenger Car ◽  
Airflow Distribution

scholarly journals Numerical study of the air distribution in the Crew Quarters on board of the International Space Station

2019 ◽  
Vol 85 ◽  
pp. 02015 ◽  
Author(s):  
Charles Berville ◽  
Matei-Răzvan Georgescu ◽  
Ilinca Năstase
Keyword(s):  
Numerical Simulations ◽  
International Space Station ◽  
Numerical Study ◽  
Ventilation System ◽  
Space Station ◽  
Air Distribution ◽  
Thermal Manikin ◽  
Airflow Rate ◽  
International Space ◽  
Airflow Distribution

The current concept of Crew Quarters on board of the International Space Station has several issues according to the crew member’s feedback. Major issues concern noise levels, the accumulation of CO2 and the quality of the air distribution. Our study targets the airflow distribution, to diagnose this issue, we realise a series of numerical simulations (CFD) based on a real scale replica of the Crew Quarters. Simulations were set with a zero-gravity mode and with the theoretical air parameters inside the SSI. The geometry includes a thermal manikin having the neutral posture of a body in the absence of gravity. Numerical simulations were run for the three different air flow rates provided by the current ventilation system. Results have shown that the air distribution inside the Crew Quarter is insufficient for low airflow rates but becomes acceptable for the higher airflow rate, however the higher airflow rate can potentially produce draught discomfort.

Experimental and numerical study of the airflow distribution in mixed-flow grain dryers

2015 ◽  
Vol 34 (5) ◽  
pp. 595-607 ◽  
Author(s):  
H. Scaar ◽  
G. Franke ◽  
F. Weigler ◽  
M. Delele ◽  
E. Tsotsas ◽  
...  
Keyword(s):  
Numerical Study ◽  
Mixed Flow ◽  
Airflow Distribution

scholarly journals Effect of Mesh Topologies to Predict Cooling Effect on Evaporative Cooling Duct

2021 ◽  
Vol 2111 (1) ◽  
pp. 012012
Author(s):  
A Jamaldi ◽  
Sarjito ◽  
A S Nurrohkayati ◽  
N T Atmoko
Keyword(s):  
Numerical Study ◽  
Evaporative Cooling ◽  
Temperature Drop ◽  
Coarse Mesh ◽  
Simulation Process ◽  
Fine Mesh ◽  
Airflow Distribution ◽  
Different Levels ◽  
Good Agreement

Abstract This paper examines the effect of different mesh types on a numerical study of evaporative cooling in the chimney. This research is a follow-up study from previous research. The test specimen used is an evaporative chimney design with the addition of a nozzle arrangement in it. The main focus of this research is the study of mesh refinement, namely by applying structured mesh during the simulation process. Three types of mesh with different levels of fineness were used for the specimens. They are coarse ( mesh A), medium (mesh B), and fine (mesh C). In addition to differences in mesh, research was also carried out with variations in the level of relative humidity (RH). The RH levels used are 5, 10, and 15%. Two main parameters of evaporative cooling performance are airflow distribution and temperature drop in the chimney. Method for measuring the distribution of airflow and temperature drop in the chimney by making five planes with different heights. The results showed that the simulation with mesh B produced a good agreement data with previous studies than mesh A and C. The RH level that generated the most optimal cooling is found at 5% RH.

Experimental and numerical study of airflow distribution in an aircraft cabin mock-up with a gasper on

2016 ◽  
Vol 9 (5) ◽  
pp. 555-566 ◽  
Author(s):  
Ruoyu You ◽  
Jun Chen ◽  
Zhu Shi ◽  
Wei Liu ◽  
Chao-Hsin Lin ◽  
...  
Keyword(s):  
Numerical Study ◽  
Aircraft Cabin ◽  
Airflow Distribution

Experimental and numerical study of airflow distribution optimisation in high-density data centre with flexible baffles

2018 ◽  
Vol 140 ◽  
pp. 128-139 ◽  
Author(s):  
Xiaolei Yuan ◽  
Yu Wang ◽  
Jinxiang Liu ◽  
Xinjie Xu ◽  
Xiaohang Yuan
Keyword(s):  
Numerical Study ◽  
High Density ◽  
Density Data ◽  
Data Centre ◽  
Airflow Distribution

Experimental and numerical study of space station airflow distribution under microgravity condition

2018 ◽  
Vol 144 ◽  
pp. 268-280 ◽  
Author(s):  
Congcong Wang ◽  
Junjie Liu ◽  
Wenjin Shang ◽  
Hejiang Sun ◽  
Jiayu Li ◽  
...  
Keyword(s):  
Numerical Study ◽  
Space Station ◽  
Microgravity Condition ◽  
Airflow Distribution

Alternative Layouts for Air Distribution Improvement of a Computing Data Center

2013 ◽  
Vol 677 ◽  
pp. 282-285
Author(s):  
F.J. Wang ◽  
C.M. Lai ◽  
Y.S. Huang ◽  
J.S. Huang
Keyword(s):  
Data Center ◽  
Best Practice ◽  
Cfd Simulation ◽  
Numerical Study ◽  
Cost Effective ◽  
Distribution Patterns ◽  
Air Distribution ◽  
Cooling Performance ◽  
Airflow Distribution ◽  
Computational Fluid Dynamics Cfd

In this study, numerical simulation by using computational fluid dynamics (CFD) codes were conducted to investigate the influence of alternative layouts for air distribution in a full scale newly constructed data center. Through the simulation of different airflow distribution patterns in the data center, the optimum practice for cooling airflow arrangement can be identified easily. The simulation results also revealed that the best practice with a vertical under floor cooling architecture can provide satisfactory airflow distribution and thermal management. Higher cooling performance can be achieved by providing better separation of cold and hot aisle stream. Rack cooling index (RCI) has been used to evaluate the cooling performance of environmental conditions for the data center facility. Numerical study through CFD simulation can not only identify the best practice for airflow distribution, but also provide the energy-efficient and cost-effective HVAC system specific for data center facility.

scholarly journals Experimental and Numerical Study for Estimation and Reduction of The Blind Spot in A Passenger Car

2021 ◽  
Vol 87 (2) ◽  
pp. 66-81
Author(s):  
Thara Reshma I. V. ◽  
Mohammad Zuber ◽  
Shlok Gupta ◽  
Akhil Agarwal ◽  
Sharun Hegde ◽  
...  
Keyword(s):  
Wind Tunnel ◽  
Numerical Study ◽  
Blind Spot ◽  
Economic Liberalization ◽  
Side View ◽  
Commercial Software ◽  
Passenger Car ◽  
Human Effort ◽  
Blind Spots

The purpose of developing an automobile was to reduce human effort, travel faster, and cover longer distances. Cars were meant for transporting a small number of people from one point to another. In India, the four-wheeler segment has picked up over the years due to economic liberalization. The vehicles have been undergoing constant improvements. This may be either in the design or the final product. Also, the importance of aerodynamics is a crucial factor considered while designing a vehicle. This study focuses on improving the aerodynamics of the side-view mirror and reducing the blind spot region. The side mirror of Toyota Etios Liva was used in this study. Blind spots were first determined, and the mirror drag is analyzed experimentally in a wind tunnel and numerically using commercial software. The results show that the drag value of the new mirror was 0.449 compared to 0.634 of the original mirror. This work helps to reduce the blind spot region of the car considered for the study.

scholarly journals Numerical models development for unidirectional air flow diffusers with lobed and circular orifices

2019 ◽  
Vol 111 ◽  
pp. 01049
Author(s):  
Laurentiu Tacutu ◽  
Ilinca Nastase ◽  
Florin Bode ◽  
Cristiana Croitoru ◽  
Catalin Lungu
Keyword(s):  
Numerical Simulation ◽  
Boundary Conditions ◽  
Numerical Study ◽  
Numerical Models ◽  
Ventilation System ◽  
Numerical Results ◽  
Airflow Distribution ◽  
Numerical Grid ◽  
Computational Resources ◽  
Real Scale

In order to achieve more realistic boundary conditions on the inlet of a ventilation system it is necessary to study the influences of the air diffuser orifices geometry on the airflow distribution in the enclosure. Integrating these orifices directly in a real scale air diffuser for a numerical study will result in a huge computational grid which will translate in huge computational resources and a much larger calculation time. The solution, in this case, was the numerical simulation of the airflow through small parts of the studied air diffuser. Later, the numerical results will be implemented as boundary conditions in the unidirectional diffuser of a numerical simulation that represents a real scale operating room (OR). In the current study two diffusers with different orifices were studied, one having circular („O”) and the other one lobbed („+”) orifices. The initial numerical model had 25 orifices on the diffuser, but because of the very large numerical grid resulted for the initial meshes (>35 million tetrahedral cells), a solution with only 4 orifices was chosen for this study. A mesh independency study was made for these two types of air diffusers. The numerical studies were made using RANS method, with SST k-ω turbulence model in steady state conditions. The numerical results obtained with the first step models showed very good agreement with the PIV stereoscopic experimental measurements.

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