Study On Two-dimensional Numerical Simulations For Flow Field Of Artifical Wetland Using Fluent

Hydrological conditions are an important basis for the definition and classification of wetland,and also a decisive factor in maintaining the circulation process of wetland.The water flow pattern of wetland is mainly described in this paper,which describes the flow path of the surface water of wetland and the difference spatial distribution of velocity,it determines the function characteristic of wetland and the quality of interior habitat.Therefore,the study of good and effective water circulation pattern in wetland is the main content of artificial wetland engineering design planning and the premise of wetland construction.Based on the artificial wetland of the west side of Fujin wetland park,this paper aims at the situation of large surface area,shallow water depth,single water supply,and unfavorable position of water source.we analyseflow field characteristics and any adverse effects,by theapplication of the two-dimensional flow field numerical simulation using computational fluid dynamics(CFD)turbulence standard k-epsilon model under the condition of different hydraulic control flow field in the wetlands,we can get the best scheme of water inflow discharge position by comparing the stagnant water distribution,increase liquidity wetland water,it can improve water purification ability,meet the demand of development of wetland biodiversity,and provides the decision-making basis for the engineering construction.By comparing the simulation results,concluded:under the condition of constant single water entry,only improving 3#or 4#entrance velocity cannot effectively solve the problem of wetland stagnant water,and will cause local vortex flow field problems,this program does little to wetland overall flow;Under the condition of fixed amount of water,the number and location of different inlet flow field have bigger effect on velocity,using more point of water entry is not completely eliminate stagnant water area than a single point,but it have the effect of the uniform water distribution;The more water point with other ways can improve liquidity of wetlands;It is better to improve the flow velocity and solve the "stagnant water area" by using the combination of 2#and 4#.The program with 5#water entrance are used to supplementthe inlet combination of 2#and 4#,which can effectively solve the problem of excessive flow velocity of large area and promote the circulation of wet water.We obtain the optimized scheme bythe analysis of hydraulic characteristics model research conclusion.At the same time,using the current data,information,etc.,according to the regular pattern of movement,change and development,current running situation and developmentⅢsituation its future of the wetland will be showed.This study will provide decision-making basis of environment comprehensive treatment,effective use of technology and management for the wetland;It also provides technical reference for the construction of water conservancy recovery measures for Sanjiang wetland.