基于局部冲刷的海底管道周围流动结构分析

Analysis on Flow Structure around a Submarine Pipeline for Study of Local Scour

基于N-S方程和泥沙输运方程,采用k-ε模型和SGS涡黏性模型为紊流传输模型;利用有限差分法进行求解,模拟的结果同Mao的试验值吻合良好。对不同管径影响的冲淤情况和流动结构做进一步模拟分析,得到了局部冲刷公式。k-ε模型和SGS模型的模拟结果表明,k-ε模型对于剪切应力的预测更具优越性。

The numerical model is based on the finite difference method of the Navier-Stokes equations and sediment transportation equations with the standard k-εan-d Smagorinsky＇ s subgrid scale （SGS） turbulence models.The calculated results agree well with Mao＇ s experimental data.Furthermore,erosion and deposition conditions and flow structures under different diameters were intensively investigated,and a local scour formula was obtained.k-ε model and SGS model results showed that k-ε model reflect its superiority on the shear stress.