Search results

Filters

  • Journals
  • Date

Search results

Number of results: 2
items per page: 25 50 75
Sort by:
Download PDF Download RIS Download Bibtex

Abstract

The article presents the method and algorithm of automatic pointer measuring devices (voltmeter, manometer, metronomes etc.) indications determination in order to determine their dynamic characteristics with the help of web-camera and personal computer. The results of testing and experimental research of developed tool for determining the dynamic characteristics of pointer measuring devices are given. Using this method, the algorithm and the software developed, the process of determining the dynamic characteristics of the pointer measuring devices was automated. The time of recognition and calculation of one measured value for a dual-core processor and webcam with a resolution of 0.3 Mp averages 250–330 ms.

Go to article

Authors and Affiliations

Volodymyr Kucheruk
Igor Kurytnik
Pavel Kulakov
Roman Lishchuk
Yulia Moskvichova
Anna Kulakova
Download PDF Download RIS Download Bibtex

Abstract

In the paper, the authors discuss the construction of a model of an exemplary urban layout. Numerical simulation has been performed by means of a commercial software Fluent using two different turbulence models: the popular k-ε realizable one, and the Reynolds Stress Model (RSM), which is still being developed. The former is a 2-equations model, while the latter – is a RSM model – that consists of 7 equations. The studies have shown that, in this specific case, a more complex model of turbulence is not necessary. The results obtained with this model are not more accurate than the ones obtained using the RKE model. The model, scale 1:400, was tested in a wind tunnel. The pressure measurement near buildings, oil visualization and scour technique were undertaken and described accordingly. Measurements gave the quantitative and qualitative information describing the nature of the flow. Finally, the data were compared with the results of the experiments performed. The pressure coefficients resulting from the experiment were compared with the coefficients obtained from the numerical simulation. At the same time velocity maps and streamlines obtained from the calculations were combined with the results of the oil visualisation and scour technique.

Go to article

Bibliography

[1] R. Yoshie, A. Mochida, Y. Tominaga, H. Kataoka, K. Harimoto, T. Nozu, and T. Shirasawa. Cooperative project for CFD prediction of pedestrian wind environment in the Architectural Institute of Japan. Journal of Wind Engineering and Industrial Aerodynamics, 95(9):1551–1578, 2007. doi: 10.1016/j.jweia.2007.02.023.
[2] A. Mochida and I.Y.F. Lun. Prediction of wind environment and thermal comfort at pedestrian level in urban area. Journal of Wind Engineering and Industrial Aerodynamics, 96(10):1498–1527, 2008. doi: 10.1016/j.jweia.2008.02.033.
[3] B. Blocken, T. Stathopoulos, J. Carmeliet, and J.L.M. Hensen. Application of computational fluid dynamics in building performance simulation for the outdoor environment: an overview. Journal of Building Performance Simulation, 4(2):157–184, 2011. doi: 10.1080/19401493.2010.513740.
[4] S.E. Kim and F. Boysan. Application of CFD to environmental flows. Journal of Wind Engineering and Industrial Aerodynamics, 81(1):145–158, 1999. doi: 10.1016/S0167-6105(99)00013-6.
[5] J. Franke, A. Hellsten, K.H. Schlunzen, and B. Carissimo. Best Practice Guideline for CFD Simulation of Flows in the Urban Environment: A Summary. University of Hamburg, Hamburg, 2007.
[6] J. Franke, A. Hellsten, K.H. Schlunzen, and B. Carissimo. The COST 732 best practice guideline for CFD simulation of flows in the urban environment: a summary. International Journal of Environment and Pollution, 44(1-4):419–427, 2011. doi: 10.1504/IJEP.2011.038443.
[7] S. Murakami, A. Mochida, and Y. Hayashi. Examining the k-ω model by means of a wind tunnel test and large-eddy simulation of the turbulence structure around a cube. Journal of Wind Engineering and Industrial Aerodynamics, 35:87–100, 1990. doi: 10.1016/0167-6105(90)90211-T.
[8] D.A. Köse and E. Dick. Prediction of the pressure distribution on a cubical building with implicit LES. Journal of Wind Engineering and Industrial Aerodynamics, 98(10):628–649, 2010. doi: 10.1016/j.jweia.2010.06.004.
[9] P.J. Richards and S.E. Norris. Appropriate boundary conditions for computational wind engineering models revisited. Journal of Wind Engineering and Industrial Aerodynamics, 99(4):257–266, 2011. doi: 10.1016/j.jweia.2010.12.008.
[10] D.A. Köse, D. Fauconnier, and E. Dick. ILES of flowover low-rise buildings: Influence of inflow conditions on the quality of the mean pressure distribution prediction. Journal of Wind Engineering and Industrial Aerodynamics, 99(10):1056–1068, 2011. doi: 10.1016/j.jweia.2011.07.008.
[11] S. Reiter. Validation process for CFD simulations of wind around buildings. In Proceedings of the European Built Environment CAE Conference, pages 1–18, London, June 2008.
[12] A. Kovar-Panskus, P. Louka, J.F. Sini, E. Savory, M. Czech, A. Abdelqari, P.G. Mestayer, and N. Toy. Influence of geometry on the mean flow within urban street canyons – a comparison of wind tunnel experiments and numerical simulations. Water, Air, and Soil Pollution: Focus, 2(5):365–380, 2002. doi: 10.1023/A:1021308022939.
[13] B. Blocken and J. Persoon. Pedestrian wind comfort around a large football stadium in an urban environment: CFD simulation, validation and application of the new Dutch wind nuisance standard. Journal of Wind Engineering and Industrial Aerodynamics, 97(5):255–270, 2009. doi: 10.1016/j.jweia.2009.06.007.
[14] M. Sakr Fadl and J. Karadelis. CFD simulations for wind comfort and safety in urban area: A case study of Coventry University central campus. International Journal of Architecture, Engineering and Construction, 2(2):131–143, 2013. doi: 10.7492/IJAEC.2013.013.
[15] B. Blocken, T. Stathopoulos, and J. Carmeliet. CFD simulation of the atmospheric boundary layer: wall function problems. Atmospheric Environment, 41(2):238–252, 2007. doi: 10.1016/j.atmosenv.2006.08.019.
[16] B. Blocken. 50 years of Computational Wind Engineering: past, present and future. Journal of Wind Engineering and Industrial Aerodynamics, 129:69–102, 2014. doi: 10.1016/j.jweia.2014.03.008.
[17] A. Flaga. Wind Engineering. Arkady, Warsaw, Poland, 2008. (in Polish).
[18] K. Klemm. A complex assessment of microclimate conditions found in widely spaced and dense urban structures. KILiW, Polish Academy of Sciences, 2011. (in Polish).
[19] K. Daniels. The Technology of Ecological Building. Birkhäuser, Basel-Boston-Berlin, 1997.
[20] R. Józwiak et al. An analysis of a potential influence on airing and wind conditions of the area surrounding an urban layout planned to be built at a lot situated in Warsaw, Powązkowska street 23/1. Warsaw University of Technology, 2013. internal, not published materials of Institute of Aeronautics and Applied Mechanics, (in Polish).
[21] B. Blocken and J. Carmeliet. Pedestrian wind environment around buildings: Literature review and practical examples. Journal of Thermal Envelope and Building Science, 28(2):107–159, 2004. doi: 10.1177/1097196304044396.
[22] E. Błazik-Borowa. Difficulties arising from the use of k-ω turbulence model for the purpose of determining the airflow around buildings.Lublin University of Technology Publisher, 2008. (in Polish).
[23] S. Murakami. Overview of turbulence models applied in CWE–1997. Journal of Wind Engineering and Industrial Aerodynamics, 74:1–24, 1998. doi: 10.1016/S0167-6105(98)00004-X.
[24] K. Hanjalic and B.E. Launder. A Reynolds stress model of turbulence and its application to thin shear flows. J. Fluid Mech, 52(4):609–638, 1972. doi: 10.1017/S002211207200268X.
[25] K. Gumowski, O. Olszewski, M. Pocwierz, and K. Zielonko-Jung. Comparative analysis of numerical and experimental studies of the airflow around the sample of urban development. Bulletin of the Polish Academy of Sciences Technical Sciences, 63(3):729–737, 2015. doi: 10.1515/bpasts-2015-0084.
[26] J.R. Taylor. Introduction to Error Analysis. University Science Books, 2nd edition, 1996.
[27] Y. Tominaga, A. Mochida, R.Yoshie, H. Kataoka, T.Nozu, M.Yoshikawa, and T. Shirasawa. AIJ guidelines for practical applications of CFD to pedestrian wind environment around buildings. Journal of Wind Engineering and Industrial Aerodynamics, 96(10):1749–1761, 2008. doi: 10.1016/j.jweia.2008.02.058.
[28] Ansys Fluent Theory Guide, version 14.0. Canonsburg, 2011.
[29] Ansys Fluent User’s Guide, version 14.0. Canonsburg, 2011.
[30] H. Montazeri and B. Blocken. CFD simulation of wind-induced pressure coefficients on buildings with and without balconies: validation and sensitivity analysis. Building and Environment, 60:137–149, 2013. doi: 10.1016/j.buildenv.2012.11.012.
Go to article

Authors and Affiliations

Mateusz Jędrzejewski
1
Marta Poćwierz
1
Katarzyna Zielonko-Jung
2

  1. Warsaw University of Technology, Institute of Aeronautics and Applied Mechanics, Warsaw, Poland
  2. Warsaw University of Technology, Faculty of Architecture, Warsaw, Poland

This page uses 'cookies'. Learn more