Simulation of Flow around Porous Trees by Numerical Methods

• Main Authors: Tsung-Chi Liang, 梁琮琪
• Other Authors: Fuh-Min Fang
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/06843581314290760128

博士 === 國立中興大學 === 土木工程學系所 === 102 === Planting pedestrian trees in building areas can commonly upgrade the landscape of the territories. Moreover, as the trees can affect the local micro-meteorology, a good planning of planting can also improve the wind environment. For the wind flow analysis during the preliminary design stage, wind tunnel experiments are mostly carried out to assess the surrounding flow field at the pedestrian level. However, a great deal of cost, time and man power is generally involved in the test work. In addition,facility limitations and technical are usually encountered in model measurements. The major object of the proposed project is to establish a numerical model, capable to correctly predict flows past porous trees, so as to provide a handy tool for pedestrian wind analysis during the preliminary design stage for planting pedestrian trees. Besides numerical computations, wind tunnel measurements are also included in the study and the experimental results will be used to confirm and guide the numerical simulation. Different from the global approaches adopted by previous researchers in analyzing wind flow in forest areas, the present study concentrates on detail analysis of flow past porous trees. The spatial variation of tree nature will be calibrated in terms of a proposed indicator based on experimental results and will be helpful for the future numerical applications. The cases of study will start from a two-dimensional condition and further expand to more realistic three-dimensional cases.