Guidebook for Practical Applications of CFD
to Pedestrian Wind Environment around Buildings


Architectural Institute of Japan

カウンター
Japanese Page

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Intoroduction

As computer facilities and Computational Fluid Dynamics (CFD) software have been significantly improved in recent years, the prediction and the assessment of pedestrian wind environment around buildings using CFD have become practical at design stages. Therefore, the guidelines, which summarize important points of using CFD technique for appropriate prediction of pedestrian wind environment, are needed. This guidebook describes the guidelines proposed by the Working Group of the Architectural Institute of Japan (AIJ). The feature of the guidelines is that it is based on the results of the cross comparison between the results of CFD predictions, wind tunnel tests and field measurements for the seven test cases, which have conducted for investigating the influence of many kinds of computational conditions for various flow fields. The guidebook also includes these computational results obtained by the Working Group and thier calculation conditions. Unfortunately, this guidebook is only available in Japanese at present.

Benchmark tests [4]

In order to clarify the major factors which affecting the prediction accuracy, the Working Group carried out cross comparisons of wind tunnel experiments, field measurements and CFD results of flow around a single high-rise building placed within the surface boundary layer, flow within a building complex in an actual urban area, and flow around a tree, obtained from various k-ε models, DSM and LES.

The following table shows the models for comparative and parametric studies as investigated by the working group. The boundary conditions and the experimental results for each case are opend. Clicking on a data set name in the table, you can directly access to the individual dataset files (EXCEL) and CAD files. The geometry, the inflow boudnary conditions and the measuring points for the flowfield are described in their worksheets.

test case

dataset

Ref.

A

2:1:1 shape building model

caseA.bmp

Data file :CaseA(1_1_2).xls

[1]

B

4:4:1 shape building model

caseB.bmp

Data file : CaseB(4_4_1).xls

[2][3]

C

Simple Building blocks

ycaseC.bmp

Data file : CaseC(City_blocks).xls

-

D

A high-rise building in city blocks

caseD.bmp

Data file : CaseD(Highrise+Blocks).xls
CAD File(DXF) : CaseD_dxf.zip
CAD File(MCD) : CaseD_mcd.zip

[5]

E

Building complexes with simple building shape in actual urban area (Niigata)

caseE.bmp

Data file : CaseE(Niigata).xls
CAD File(DXF) :CaseE_dxf.zip
CAD File(MCD) : CaseE_mcd.zip

[6]

F

Building complexes with complicated building shape in actual urban area (Shinjuku)

caseF.bmp

Data file : CaseF(Shinjuku).xls
CAD File(DXF) :CaseF_dxf.zip
CAD File(MCD) : CaseF_mcd.zip
CAD File(STL) : CaseF_stl.zip

[6]

G

Two-dimensional pine tree

caseG.bmp

Data file : CaseG(Tree).xls

[7]


H Flow and concentration fields around a building within non-isothermal and isothermal boundary layers This database is vailable on the website of Global COE Program, Tokyo Polytechnic University [9]


 

AIJ guidelines for practical applications of CFD to pedestrian wind environment around buildings [8]

The guidelines for practical application of CFD to the pedestrian wind environment around buildings were proposed by the working group of the AIJ. They are based on the results of cross-comparison between CFD predictions, wind tunnel test results and field measurements for seven test cases, which have been conducted to investigate the influence of many kinds of computational conditions for various flow fields. They summarize important points in using CFD techniques to predict the pedestrian wind environment. The authors believe that the guidelines presented here give useful information for predicting and assessing the pedestrian wind environment around buildings using CFD. The results of cross-comparisons for the seven test cases conducted within this project will be utilized to validate the accuracy of CFD codes used in the practical applications of wind environment assessments.

References

[1] Mochida, A., Tominaga, Y., Murakami, S., Yoshie, R., Ishihara, T., Ooka, R., 2002. Comparison of various k-εmodel and DSM applied to flow around a high-rise building - report on AIJ cooperative project for CFD prediction of wind environment -, Wind & Structures 5, No.2-4, 227-244.  pdf 

[2] Shirasawa, T., Tominaga, T., Yoshie, R., Mochida, A., Yoshino, H., Kataoka, H., Nozu, T., 2003, Development of CFD method fr predicting wind environment around a high-rise building Part2 : The cross comparison of CFD results using various k- models for the flowfield around a building model with 4:4:1 shape, AIJ Journal of Technology and Design, No.18, 169-174.
(in Japanese) pdf

[3] Tominaga, Y., Mochida, A., Shirasawa, T., Yoshie, R., Kataoka, H., Harimoto, K., Nozu, T., 2004. Cross Comparisons of CFD Results of Wind Environment at Pedestrian Level around a high-rise Building and within a Building Complex, Journal of Asian Architecture and Building Engineering, 63-70. pdf

[4] Yoshie, R., Mochida, A., Tominaga, Y., Kataoka, H., Harimoto, K., Nozu, T., Shirasawa, T., 2005. Cooperative project for CFD prediction of pedestrian wind environment in the Architectural Institute of Japan. Journal of Wind Engineering and Industrial Aerodynamics, Volume 95, Issues 9-11, October 2007, 1551-1578
 pdf

[5] Yoshie, R., Mochida, A., Tominaga, T., Kataoka, H., Yoshikawa, M., 2005. Cross Comparisons of CFD Prediction for Wind Environment at Pedestrian Level around Buildings. Part 1 Comparison of Results for Flow-field around a High-rise Building Located in Surrounding City Blocks. The Sixth Asia-Pacific Conference on Wind Engineering (APCWE-VI) Seoul, Korea, September 12-14, 2005
 pdf

[6] Tominaga, Y., Yoshie, R., Mochida, A., Kataoka, H., Harimoto, K., Nozu, T., 2005. Cross Comparisons of CFD Prediction for Wind Environment at Pedestrian Level around Buildings. Comparison of Results for Fiowfield around Building Complex in Actual Urban Area. The Sixth Asia-Pacific Conference on Wind Engineering (APCWE-VI) Seoul, Korea, September 12-14, 2005
 pdf

[7] Mochida, A., Tabata, Y., Iwata, T., Yoshino, H., 2006, Optimization of Tree Canopy Model for CFD Prediction of Wind Environment at Pedestrian Level, Journal of Wind Engineering and Industrial Aerodynamics, Volume 96, Issues 10-11, October-November 2008, Pages 1667-1677 pdf

 

[8] Tominaga, Y., Mochida, A., Yoshie, R., Kataoka, H., Nozu, T., Yoshikawa, M., Shirasawa, T., AIJ guidelines for practical applications of CFD to pedestrian wind environment around buildings. Journal of Wind Engineering and Industrial Aerodynamics, Volume 96, Issues 10-11, October-November 2008, 1749-1761 pdf

[9] R.Yoshie, H.Tanaka, T.Shirasawa, Technique for Simultaneous Measurement of Fluctuating Concentration, Velocity and Temperature in Non-isothermal Flow, Proceedings of the 12th International Conference on Wind Engineering, pp.1399-1406, July, 2007 pdf