A Closed Loop Full-Scale Automotive Climatic Wind Tunnel for Vehicle Environment Simulation

2000 ◽  
Author(s):  
S. A. A. Abdul Ghani ◽  
A. Aroussi ◽  
E. Rice
Keyword(s):  
Wind Tunnel ◽  
Closed Loop ◽  
Cfd Simulation ◽  
Fluid Dynamic ◽  
Full Scale ◽  
Cold Weather ◽  
Test Bed ◽  
Climatic Environment ◽  
Heat Loading ◽  
Climatic Wind Tunnel

Abstract This paper describes the simulation of vehicle natural climatic environment in a closed loop full-scale automotive climatic wind tunnel. The tunnel simulates wind, rain, and temperature for several road conditions. It generates under controlled heat loading, wind speeds of up to 50kph with different approach boundary conditions, rainfalls from drizzle to cloudburst and road inclines up to 15° in any direction. The design and optimization process of the tunnel functions is outlined and examples of its use in vehicle development are given. The size constraint and the need for a compact design are important features of the tunnel. The tunnel provides an important test bed for close scrutiny of the relationship between rain ingress, vehicle speed, road condition, heat loading and vehicle geometry. The tunnel can also be used to study vehicle thermal management, vehicle thermal comfort, engine cold starting, and wipers efficiency in severe cold weather. Computational Fluid Dynamic (CFD) simulation is used to optimize and asses the performance of a number of key tunnel components. The resulting tunnel is approximately 9.5m in length, 9.5 m in height and 3 m in width.

scholarly journals A Closed-Loop Optimized System with CFD Data for Liquid Maldistribution Model

Processes ◽  
2020 ◽  
Vol 8 (11) ◽  
pp. 1332
Author(s):  
Wei Zhang ◽  
Liyi Li ◽  
Baoping Zhang ◽  
Xin Xu ◽  
Jian Zhai ◽  
...  
Keyword(s):  
Closed Loop ◽  
Cfd Simulation ◽  
Fluid Dynamic ◽  
Structural Parameters ◽  
Computational Cost ◽  
Pso Algorithm ◽  
Oil Refining ◽  
Support Vector ◽  
Cfd Validation ◽  
Liquid Distributor

For the simulation of a trickle-bed reactor (TBR) in coal and oil refining, modeling the liquid maldistribution of the gas-liquid distributor incurs enormous pre-processing work and bears a huge computational cost. A closed-loop optimized system with computational fluid dynamic (CFD) data is therefore proposed for the first time in this paper. A fast prediction model based on support vector regression (SVR) is developed to simplify the modeling of the liquid flow rate in TBRs. The model uses CFD simulation results to determine an optimized set of structural parameters for the gas-liquid distributor in TBRs. In order to obtain an accurate SVR model quickly, the particle swarm optimization (PSO) algorithm is employed to optimize the SVR parameters. Then, the structural parameters corresponding to the minimum liquid maldistribution factor are calculated using the response surface methodology (RSM) based on the hybrid PSO-SVR model. The CFD validation results show a good agreement with the values predicted by RSM, with liquid maldistribution factors of 0.159 and 0.162, respectively.

Experimental Method Study of Climatic Evaporation of Porous Material in Wind Tunnel

2011 ◽  
Vol 71-78 ◽  
pp. 4449-4453
Author(s):  
Yu Zhang ◽  
Qing Lin Meng
Keyword(s):  
Wind Tunnel ◽  
Porous Material ◽  
Experimental Model ◽  
Water Evaporation ◽  
Climatic Parameters ◽  
Small Step ◽  
Climatic Environment ◽  
The Impact ◽  
Climatic Wind Tunnel ◽  
Climatic Elements

A hot-humid climatic wind tunnel using wind tunnel technology was developed to simulate the true outdoor dynamic climatic parameters, including solar radiation, air temperature, relative humidity and wind speed, which realized a small-step periodic changing climatic environment of a particular area. To obtain atmospheric evaporation force of porous material, water evaporation experiment representing the impact of climatic elements with atmospheric evaporation force was carried out, then a Penman formula based water evaporation experimental model was built. Considered to different texture of materials, different beginning times and different climatic parameters, porous material evaporation experiments were carried out and an experimental model was established.

Analysis of Temperature and Residence Time of the Exhausts in the Combustion Chamber of an Incinerator Plant

2008 ◽  
Author(s):  
M. Costa ◽  
M. Dell’Isola ◽  
N. Massarotti ◽  
A. Mauro
Keyword(s):  
Combustion Chamber ◽  
Cfd Simulation ◽  
Fluid Dynamic ◽  
Waste Incineration ◽  
Numerical Approach ◽  
Full Scale ◽  
Practical Applications ◽  
The Common ◽  
Semi Empirical ◽  
The Impact

The interest for energy recovery from waste incineration has increased over the years, in order to reduce the number of landfills and produce electricity and heat. At the same time, concern for the impact such processes have on the environment has also grown, and to reduce such an impact, new legislation is being enforced in Europe and Italy. In particular, important restrictions are imposed on the temperature of the exhausts in the combustion chamber, which must be kept above certain values for a given period of time, depending on the type of waste that is being incinerated. Such conditions can be rather difficult and certainly very expensive to monitor with acceptable accuracy. For this reason, in practical applications the temperature of the exhausts in the chamber is usually calculated through semi-empirical and approximate models that relate the temperatures in different sections of the chamber. In this work, the authors present a numerical approach for the analysis of such models that can be used to quantify the uncertainty on this type of measurement due to the common approximations used in full scale incineration plants. The analysis is based on the CFD simulation of the thermo-fluid-dynamic field in the combustion chamber of a full scale plant in Italy, whose results have verified based on a comparison with the data collected during an experimental campaign.

scholarly journals Prediction of HAVC Cool-Down Performance inside a Minibus Passenger Cabin Using CFD and Its Experimental Validation.

2019 ◽  
Vol 11 (01) ◽  
pp. 47-56
Author(s):  
Nikhil Mhetre ◽  
Suraj Sathyanarayan ◽  
Manoj Diwan ◽  
Siddharth Kumar ◽  
Dattatray Hulwan
Keyword(s):  
Wind Tunnel ◽  
Heat Load ◽  
Cfd Simulation ◽  
Wind Tunnel Testing ◽  
Cfd Model ◽  
Simulation Methodology ◽  
Computational Fluid Dynamics Cfd ◽  
Climatic Wind Tunnel ◽  
Passenger Cabin ◽  
Good Agreement

Now with more time spent by people while travelling and increasing mobility, providing passengers with a thermally comfortable experience are one of the important targets of any bus manufacturer. Conversely, comprehensive assessment through Climatic Wind Tunnel testing is costly and not possible during early stages of vehicle design. The aim of this work has been to develop a simplified simulation methodology to model the Minibus passenger cabin for cool down test. This study presents a methodology for predicting Heating, Ventilation and Air Conditioning (HVAC) cool-down performance inside Minibus cabin using Computational Fluid Dynamics (CFD) simulation to revise the HVAC duct design and parametric optimization in order to ensure thermal comfort of occupant. Heat Load is calculated analytically and has been considered in the CFD model and occupant heat load is considered as per ASHRAE standard. CFD simulation predicted the temperature and velocity distribution inside passenger cabin. Simulated cool-down results were found to be in good agreement with the experimental results. CFD cool-down prediction is useful in order to reduce time and costs related to climatic wind tunnel and road tests. Validated CFD model is used to study the effect of air flow on cool-down performance.

Integrated Aero-Thermal Testing of a Race Car in a Full Scale Climatic Wind Tunnel

2016 ◽  
Author(s):  
Abdalla Abdel-Rahman ◽  
Martin Agelin-Chaab ◽  
Gary Elfstrom ◽  
John Komar
Keyword(s):  
Wind Tunnel ◽  
Full Scale ◽  
Thermal Testing ◽  
Race Car ◽  
Climatic Wind Tunnel

scholarly journals ANALISIS ALIRAN ANGIN PADA ATAP MIRING MELALUI UJI SIMULASI FLOW DESIGN

2017 ◽  
Vol 4 (2) ◽  
pp. 136 ◽  
Author(s):  
Siti Belinda Amri ◽  
La Ode Abdul Syukur
Keyword(s):  
New York ◽  
Wind Tunnel ◽  
Drag Coefficient ◽  
Computational Fluid Dynamic ◽  
Structural Damage ◽  
Cfd Simulation ◽  
Fluid Dynamic ◽  
Wind Flow ◽  
Engineering Structures ◽  
Structural Resistance

Bidang penelitian tentang aliran angin pada bangunan sangat penting baik untuk perencanaan bangunan maupun pemukiman. Aliran angin yang mempengaruhi bangunan memiliki dampak pada ketahanan struktural terhadap angin. Penelitian dilakukan untuk mengetahui nilai drag coefficient atau gaya hambat terhadap angin yang dihasilkan pada atap miring dengan nilai sudut yang berbeda. Metode yang digunakan adalah dengan menguji model atap melalui simulasi CFD (Computational Fluid Dynamic) pada software Autodesk Flow Design. Hasil uji lima atap miring dengan nilai 0o, 15o, 30o, 45o, dan 60o menujukkan bahwa semakin besar sudut atap maka semakin besar luas bidang atap yang bersentuhan dengan aliran angin datang, hal ini sejalan dengan nilai average drag coefficient yang dihasilkan. Atap dengan sudut 60o memiliki luas bidang atap dan nilai average drag coefficient yang tertinggi diantara kelima sudut atap yang diuji, dengan nilai luas 72 m2 menghasilkan nilai average drag coefficient sebesar 1,4. Bangunan dengan nilai drag coefficient yang tinggi memiliki resiko kerusakan struktur yang tinggi akibat angin karena memiliki bentuk yang kurang aerodinamis.Kata-kata Kunci: aliran angin, atap miring, Flow Design, drag coefficient.ANALYSIS OF WIND FLOW PATTERN ON SLOPED ROOF USING FLOW DESIGN SIMULATIONThe field of research on wind flow on buildings is important for both building planning and planning a residential areas. Wind flow affecting the building has an impact on structural resistance to the wind. The study was conducted to find out the value of drag coefficient or drag force against the wind generated on the sloped roof with different angle values. The method applied by tested the roof model through CFD (Computational Fluid Dynamic) simulation through Autodesk Flow Design software. The test results of five sloped roofs with angle 0o, 15o, 30o, 45o, and 60o showed that the higher the angle of the roof, the larger the area of the roof in contact with the approaching wind flow. This is in line with the average drag coefficient value generated. The roof with an angle of 60o has a large roof area and the highest average drag coefficient among the five tested roof angles, with an area of 72 m2 yields and average drag coefficient of 1.4. Buildings with high drag coefficient value have a high risk of structural damage due to wind because it has a less aerodynamic shape.Keywords: wind flow, sloped roof, Flow Design, drag coefficient REFERENCESAutodeks Help (2015), Get Started With Autodesk Flow Design,  https://www.autodesk.com/products/flow-design/overview (diakses tanggal 5 November 2017)Bhandari NM, Krishna P. (2011) An Explanatory handbook on proposed IS- 875 (Part 3): Wind loads on buildings and structure. IITK-GSDMA Project on Building Codes.Boutet, T. (1987). Controlling Air Movement. New York: McGraw Hill.Chung, TJ., (2010), Computational Fluid Dynamic. Cambridge: Cambidge University Press.Driss, S., Driss, Z., & Kammoun, I. K. (2014). Impact of Shape of Obstacle Roof on the Turbulent Flow in a Wind Tunnel. American Journal of Energy Research, 90-98.Groat, Linda N., David Wang (2002), Architectural Research Methods, New York: John Wiley and Sons.Guirguis, N., El-Aziz, A. A., & Nassief, M. (2007). Study of wind effects on different buildings of pitched roofs. Desalination, 190–198.Lechner, N. (2007). Heating, Cooling, Lighting: Metode Desain untuk Arsitektur. Jakarta: Rajawali.Lippsmeier, G. (1997). Bangunan Tropis. Jakarta: Erlangga.Mujiasih, S., & Primadi S.T., (2014), Analisis Kejadian Puting Beliung Tanggal 11 Desember 2013 di Wilayah Denpasar Bagian Selatan–Bali, Prosiding Workhop Operasional Radar dan Satelit Cuaca, Jakarta: BMKG.Stathopoulos and B.A. Baskaran, (1996) “Computer simulation of wind environmental conditions around buildings”, Engineering Structures, 18(11), 876-885.Szokolay, N. V. (1980). Environmental Science Handbook. New York: Wiley.Tominaga, Y., Akabayashi, S., Kitahara, T., & Arinami, Y. (2015). Air flow around isolated gable-roof building with different roof pitches: Wind Tunnel experiments and CFD Simulation. Building and Environment, 204-213.

scholarly journals Study on Turbulence Intensity Behavior under a Large Range of Temperature Variation

Processes ◽  
2020 ◽  
Vol 8 (11) ◽  
pp. 1403
Author(s):  
Junsik Lee ◽  
Jae-Hak Lee
Keyword(s):  
Wind Tunnel ◽  
Turbulence Intensity ◽  
Cfd Simulation ◽  
Fluid Dynamic ◽  
Wind Tunnel Test ◽  
Mean Value ◽  
Velocity Variation ◽  
Boundary Layer Development ◽  
High Temperature Maximum ◽  
Safety Estimation

The turbulence intensity (TI) is defined as the ratio of fluctuation from the standard deviation of wind velocity to the mean value. Many studies have been performedon TI for flow dynamics and adapted various field such as aerodynamics, jets, wind turbines, wind tunnel apparatuses, heat transfer, safety estimation of construction, etc.The TI represents an important parameter for determining the intensity of velocity variation and flow quality in industrial fluid mechanics. In this paper, computational fluid dynamic (CFD) simulation of TI alteration with increasing temperature has been performed using the finite volume method. A high-temperature—maximum 300 degrees Celsius (°C)—wind tunnel test rig has been used as theapparatus, and velocity was measured by an I-type hot-wire anemometer. The velocity and TI of the core test section were operated at several degrees of inlet temperatures at anair velocity of 20 m/s. The magnitude of TI has a relationship with boundary layer development. The TI increased as temperature increased due to turbulence created by the non-uniformities.

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