水流作用下悬挂式防污帘有效深度数值模拟

Numerical simulation ofeffective depth of hanging silt curtains under flow

水流与结构相互作用下的防污帘有效深度是影响其防污效果的关键因素。为探究防污帘有效深度随流速等参数的变化,基于ADINA软件动网格控制技术,结合双向流固耦合方法建立悬挂式防污帘大变形二维有限元数值模型,以分析流速、帘长及配重对防污帘有效深度的影响规律。运用防污帘变形倾角,描述悬挂式防污帘在不同负载下的变形特征,并回归拟合防污帘相对有效深度的预测经验公式。结果表明:悬挂式防污帘相对有效深度随流速增大而减小,随相对帘长与配重的增大而增大;倾角随流速与相对帘长的增大而增大,随配重的增大而减小。

The effective depth of hanging silt curtain under the interaction of water flow and structure is the key factor affecting its antifouling effect.To explore the change of effective depth of hanging silt curtain with flow rate,length,and counterweight under the interaction of water flow and structure,a series of numerical simulations are carried out based on ADINA software.Based on the bidirectional fluid-solid coupling method,combining finite element technology and dynamic grid control technology,the structural grid is divided by using the Native geometric modeling method.Several grid control points are set up to establish the two-dimensional finite element numerical model of large deformation of hanging silt curtain and to simulate the deformation process of silt curtain under different water flows.The vertical deformation of the silt curtain under the effect of water flow is studied,and the change rule of effective depth of the silt curtain with flow rate,curtain length,and counterweight is analyzed.The deformation characteristics of hanging silt curtains under different loads are described by using the deformation inclination of the silt curtain.An empirical formula for predicting the relative effective depth of the anti-pollution curtain is established.The results show that flow rate and counterweight have a significant influence on the effective depth of hanging silt curtains.The relative effective depth of hanging silt curtains decreases with increasing flow rate and increases with increasing relative curtain length and counterweight.The curtain inclination increases with the increase of flow rate and relative curtain length and decreases with the increase of counterweight.Finally,an empirical formula for predicting the effective depth of silt curtain is established,which links the relative effective depth of silt curtains with parameters such as flow rate,curtain length,and counterweight,and can quantitatively reflect its influence law.It provides a reference for calculating the counterweight required for the relative effective depth of silt curtains in practical engineering.