将大涡模拟法（ Ｌ Ｅ Ｓ） 简化为二维形式，利用较简单的 Ｓｍａｇｏｒｉｎｓｋｙ（ Ｓ Ｇ Ｓ） 子涡模型封闭水流运动方程组，建立了非淹没群丁坝绕流的平面二维数学模型。方程在空间上采用控制体积法离散，时间上采用 Ｍａｃ Ｃｏｒｍａｒｋ 预测－ 校正步进计算，计算结果成功的模拟出群丁坝上下游各涡的特征量及流场情况，与水槽试验的实测资料基本吻合。 The large eddy simulation method (L E S) was simplified to a two-dimensional form, and the simple two-dimensional model of the flow field was closed by using the simple Smagorinsky (S G S) vortex model. The equations are discretely controlled by the control volume method in space, and Maccormark prediction-correction step calculation is used in time. The calculated results of the vortex characteristics and the flow field of the upstream and downstream of the group of Dingding dam are basically consistent with the measured data of the tank test .