Abo Bibliothek: Guest
Digitales Portal Digitale Bibliothek eBooks Zeitschriften Referenzen und Berichte Forschungssammlungen
Computational Thermal Sciences: An International Journal
ESCI SJR: 0.249 SNIP: 0.434 CiteScore™: 1.4

ISSN Druckformat: 1940-2503
ISSN Online: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.2012005093
pages 317-333

NUMERICAL STUDY OF UNSTEADY AIRFLOW PHENOMENA IN A VENTILATED ROOM

Kana Horikiri
Faculty of Science, Engineering and Computing, Kingston University, London SW15 3DW, United Kingdom
Yufeng Yao
Jun Yao
School of Engineering, Isaac Newton Building, University of Lincoln, Brayford Pool, Lincoln LN6 7TS, UK

ABSTRAKT

Numerical simulation of airflow in an indoor environment has been carried out for forced, natural, and mixed convection modes, respectively, by using the computational fluid dynamics (CFD) approach of solving the Reynolds-averaged Navier−Stokes equations. Three empty model rooms in two-dimensional configuration were studied first; focusing on the effects of grid refinement, mesh topology, and turbulence model. It was found that structured mesh results were in better agreement with available experimental measurements for all three convection scenarios, while the renormalized group (RNG) к − ε turbulence model produced better results for both forced and mixed convections and the shear stress transport (SST) turbulence model for the natural convection prediction. Further studies of air velocity and temperature distributions in a three-dimensional cubic model room with and without an obstacle have shown reasonably good agreement with available test data at the measuring points. CFD results exhibited some unsteady flow phenomena that have not yet been observed or reported in previous experimental studies for the same problem. After analyzing the time history of velocity and temperature data using fast Fourier transformation (FFT), it was found that both air velocity and temperature field oscillated at low frequencies up to 0.4 Hz and the most significant velocity oscillations occurred at a vertical height of an ankle level (0.1 m) from the floor, where temperature oscillation was insignificant. The reasons for this flow unsteadiness were possibly a higher Grashof number, estimated at 0.5 × 106 based inflow conditions, and thus strong buoyancy driven effects caused the oscillations in the flow field. The appearance of an obstacle in the room induced flow separation at its sharp edges and this would further enhance the oscillations due to the unsteady nature of detached shear-layer flow.


Articles with similar content:

NUMERICAL STUDY OF UNSTEADY AIRFLOW PHENOMENA IN A VENTILATED ROOM
ICHMT DIGITAL LIBRARY ONLINE, Vol.0, 2012, issue
Yufeng Yao, Kana Horikiri, Jun Yao
LARGE EDDY SIMULATION OF THE TURBULENT FLOW PAST A BACKWARD FACING STEP WITH HEAT TRANSFER AND PROPERTY VARIATIONS
TSFP DIGITAL LIBRARY ONLINE, Vol.2, 2001, issue
Richard H. Pletcher, Ravikanth V.R. Avancha
EXPERIMENTAL STUDY OF NATURAL CONVECTION IN A CAVITY: PRECISE VISUALIZATION METHOD OF TEMPERATURE FIELD
International Heat Transfer Conference 16, Vol.9, 2018, issue
Junnosuke Okajima, Menghua Duan, Atsuki Komiya, Lin Chen, Yongchang Feng
HEAT TRANSFER ENHANCEMENT OF A FLAT PLATE BY A DUAL COOLING JET AIRFLOW: EXPERIMENTAL AND NUMERICAL APPROACH
International Heat Transfer Conference 16, Vol.20, 2018, issue
Claudia Cadile, J-P. Fradin, G. Debenest
Computing Turbulent Flow and Heat Transfer past a Wall-Mounted Cube in a Channel
ICHMT DIGITAL LIBRARY ONLINE, Vol.0, 2015, issue
Tom Shih