本文選題：VOF法 + 數(shù)值模擬　； 參考：《水電能源科學》2017年03期

【摘要】：為研究輸水系統(tǒng)中堰井段水面的波動現(xiàn)象,采用Realizableκ-ε紊流模型耦合VOF法對分段低壓輸水系統(tǒng)進行二維數(shù)值模擬,分析了堰后水深對水面波動規(guī)律的影響,探討了在外加擾動作用下水面波動的規(guī)律。結(jié)果表明,堰后存在高、低兩個水位區(qū)間,堰后水位處于這兩個區(qū)間時,水面將會以某一主要頻率穩(wěn)定持續(xù)地波動;當堰后水位處于這兩個區(qū)間之外時,水面波動變得無規(guī)律或只有微弱的波動。外加擾動對水面波動會造成一定影響,當外加擾動頻率與水面波動固有頻率一致時,即使外加擾動強度很小也會引起水力共振,水面波動幅度大大增加;外加擾動頻率與固有頻率相差較大時,水面波幅在某些特定時刻達到最大,然后減小到最小值,再增大到最大值,波動幅值的變化呈周期性,并推導(dǎo)出了相應(yīng)的周期公式,為相關(guān)研究提供了參考。
[Abstract]:In order to study the fluctuation of water surface in Weir well section in water conveyance system, a two-dimensional numerical simulation was carried out by using the realizable 魏-蔚 turbulent model coupled with VOF method. The influence of water depth after Weir on water surface fluctuation was analyzed. The law of water surface fluctuation under the action of external disturbance is discussed. The results show that there are two water levels at the back of the Weir. When the water level is in these two zones, the water level will fluctuate steadily and continuously at a certain main frequency, and when the water level behind the Weir is outside the two intervals, Water surface fluctuations become irregular or have only slight fluctuations. When the external disturbance frequency is consistent with the natural frequency of the water surface wave, even if the external disturbance intensity is very small, it will cause hydraulic resonance, and the fluctuation amplitude of the water surface will increase greatly. When the external disturbance frequency is different from the natural frequency, the amplitude of water surface wave reaches the maximum at certain time, then decreases to the minimum value, then increases to the maximum value. The fluctuation amplitude changes periodically, and the corresponding periodic formula is derived. It provides a reference for related research.
【作者單位】： 河海大學水利水電學院;
【分類號】：TV135

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