In this research, the accuracy of the Flow-3D numerical model in the flow simulation in a stepped spillway was probed using data obtained from the physical model. In addition, the effects of block barriers on the energy dissipation rate were investigated. To adopt a proper turbulent model, Renormalization Group k-ε, RNG k-ε, and standard k-ε models were employed. Then, the Flow-3D was run in five discharges for nine spillways with the ratios of block length to step length (L_b/l) and block height to step height (H_b/h) as 0.3, 0.4, and 0.5. The results indicated that both turbulent models had almost similar outcomes though the run time of the RNG k-ε model was shorter. The blocks with a shorter length in low ratios of H_b/h and the lengthier blocks in high ratios of H_b/h undergo more relative energy dissipation relative to the no-block situation. For H_b/h = 0.3 and L_b/l equal to 0.3, 0.4, and 0.5, the relative energy dissipation climbed on average as 8.5, 6.5, and 4.5% respectively, compared with the no-block case. The most influence exerted on relative energy dissipation was obtained via the blocks with H_b/h = L_b/l equal to 0.3 and 0.5 with respective increases of 8.6 and 8.4%.

在这项研究中，使用从物理模型获得的数据来探讨Flow-3D数值模型在阶梯式溢洪道内流动模拟中的准确性。另外，研究了阻挡壁垒对能量耗散率的影响。为了采用合适的湍流模型，使用了重归一化组k- ε，RNGk- ε和标准k- ε模型。然后，Flow-3D在九个溢洪道的五个排放口中运行，其阻块长度与步长之比（L _b / l）和阻块高度与步高之比（H _b / h的比率））分别为0.3、0.4和0.5。结果表明，尽管RNGk- ε模型的运行时间较短，但两种湍流模型的结果几乎相似。在的低比的较短的长度的块ħ _b / ħ并在高比率更长块ħ _b / ħ经受相对于无堵塞的状况更相对能量耗散。对于H _b / h = 0.3和L _b / l等于0.3、0.4和0.5，与无阻塞情况相比，相对能量耗散平均分别上升了8.5％，6.5％和4.5％。通过H _b / h = L _b / l等于0.3和0.5的块获得了对相对能量耗散的最大影响，分别增加了8.6和8.4％。