Free-surface vortex formation is one of the undesirable hydraulic phenomena that may occur at intakes during the dewatering reservoir. This research is meant to investigate the effect of waves on formed vortices in vertical intakes numerically by applying STAR-CCM + software. The simulation was conducted to model the free surface and turbulence by volume of fluid and large eddy simulation methods, respectively. Sensitivity analysis was undertaken on different mesh sizes to select appropriate mesh dimensions. Then, verification was performed by Sun and Liu (J Hydraul Res 53:787–796, 2015) experimental data. Results showed that waves reduce or eliminate hydraulic parameters of the formed vortices such as vortex strength, tangential, radial, and axial velocity components. The reduction appeared by average values of 32%, 30%, 22%, and 25% in vortex strength, tangential, radial, and axial velocity components, respectively. Waves also led to decrement in the length and diameter of air-core of vortices about 45% for the former and more than 50% for the latter. In addition, it was concluded that the smaller the waves, the greater their effects would appear on the elimination of the vortex phenomenon. Finally, a relationship between the wave properties, as a hydraulic approach to anti-vortex, and vortex parameters was developed.

自由表面涡旋形成是在脱水储水期间可能发生在入口处的不期望的水力现象之一。这项研究旨在通过应用STAR-CCM +软件以数字方式研究波浪对垂直进气道中形成的涡流的影响。分别通过流体体积和大涡模拟方法对自由表面和湍流进行了模拟。在不同的网格尺寸上进行了敏感性分析，以选择合适的网格尺寸。然后，通过Sun和Liu（J Hydraul Res 53：787–796，2015）实验数据进行验证。结果表明，波减少或消除了形成的旋涡的水力参数，例如旋涡强度，切向，径向和轴向速度分量。减少的平均值为32％，30％，22％，涡流强度，切向，径向和轴向速度分量分别为25％和25％。波浪还导致涡流的长度和直径减小，前者约为45％，后者约为50％。此外，得出的结论是，波越小，它们对消除涡旋现象的影响越大。最后，建立了波浪特性（作为抗涡的一种水力方法）与涡参数之间的关系。