Simulation and analysis of ventilation flow through a room caused by a two-sided windcatcher using a LES method

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Conference Proceeding
Lecture Notes in Engineering and Computer Science, 2014, 2 pp. 1294 - 1297
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A windcatcher is a structure fitted on the roof of a building for providing natural ventilation using wind power; it exhausts the inside stale air to the outside and supplies the outside fresh air into the building interior space working by pressure difference between outside and inside of the building and using two fundamental natural ventilation principles; namely the stacks effects and the wind driven ventilation. In this paper, air flow through a three-dimensional room fitted with a two-sided windcatcher is observed numerically, using a commercial computational fluid dynamics (CFD) software package. In this simulation, the optimized model in RANS (Reynolds Averaged Navier-Stokes) method and the standard two- equation K-ε turbulence model has been simulated by using LES (Large Eddy Simulation) CFD technique which is more accurate than RANS method and the results have been analyzed and compared with the obtained results from RANS technique for the optimized model among other models with various windcatcher's bottom shapes, various windcatcher's positions, various inlet velocities, and various windcatcher's bottom lengths. The achieved results from LES method verify that the two-canal centred position windcatcher with the bottom length of 10 cm provides full circulation for most part of the room and large region of stable velocity in the acceptable range of indoor air speed for human comfort.
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