The Study On Wind Distribution Of Rubber Plantation In Hainan Island Based On CFD Technology

Strong wind is one of the worst disasters for Hainan rubber plantations,rubber Plantation in the planning and design of the most important is to improve it's wind resistance for to reduce the impact of wind disaster,wind resistance is closely related to rubber tree height,rubber plantation area,rubber tree canopy area,windbreaks and other factors.In order to find the best wind-resistant design,based on numerical simulation,by reference to the distinctive characteristics of the wind of rubber plantation,using modeling software designed to be closer to the actual rubber plantations and we study two-dimensional simulation of the wind distribution for ordinary rubber plantations by CFD software in this paper.ln addition,we also studied the single factor change for rubber tree height,rubber plantation site,rubber tree canopy area,windbreaks after the ordinary rubber plantation study.CFD is specialized in research methods of physical flow field.It is not only fast and can save a lot of manpower and material costs.For application purposes,another addition to research question in this paper and also described how to use the CFD software to solve research problems.Research subjects in the paper mainly Strong wind(including typhoons).The main conclusions are as follows:Firstly,rubber plantation has obvious characteristics of the wind distribution.According to changes in wind speed can be divided into three stages,these three period are decrease,fluctuation and stability,in all of which the tree tops bear the strongest wind power.At the tree tops,wind speed fluctuates at 39.1 percent of the speed at Initial speed.The length of the first line trees' reaching the stable period is about 5.5 times longer than the height of trees in the first line.At the stable period,wind speed fluctuates at 44.7 percent of the speed at Initial speed.Secondly,Single-factor rule change significantly for wind distribution of rubber Plantation.Different rubber tree of rubber plantation significantly different heights with wind distribution and Wind speed and rubber tree height are positively correlated.Changes of basically the same with different sizes of rubber plantations,large rubber plantations is a continuation of small rubber plantations in stable period.Canopy area of rubber tree has significant effect with wind distribution and the more the greater the crown area by wind.Windbreaks have significant impact for wind distribution of rubber plantation,windbreaks reduce wind speed efficiently and it's protection length is longer than plantations without windbreak.Thirdly,phenomenon of turbulence obviously.Turbulence occurs mainly in the recirculation region and the stable period.Effect of different factors influence the position of turbulence,among them,the most obvious with windbreaks and tree height.According to the results,when design of rubber plantations and reconstruction we can taking into account the problems of dwarf.lt should also be should attention to pruning and shaping in peacetime.Finally,planting shelterbelt and good shelterbelt design has a significant effect.