Numerical calculation methods of water distribution systems in hydraulic transient conditions
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摘要: 為計算給水管網中非恒定流動運行工況,使系統可以快速平穩地完成工況轉換,以非恒定流動理論為基礎,分別利用重分阻尼系數法劃分時間步長的特征線法和引入摩阻附加項的玻爾茲曼網格法計算給水管網非恒定流動的數學模型,并應用于某小區給水管網的非恒定流動工況分析中.結果表明,在管網非恒定流工況下,當Re ≤ 7 000時利用玻爾茲曼網格法計算,否則利用特征線法計算將提高計算的準確性和計算效率.Abstract: Transient phenomena often happen in water distribution systems (WDS). In order to accelerate system transformation from unsteady state to steady state, two mathematical models were proposed based on the theory of transient flow, which are the method of characteristics (MOC) with re-divide damping coefficient and the lattice Boltzmann equation (LBE). These methods were used to calculate an example in WDS. It is shown that LBE is more accurate when Reynolds number is less than 7 000, otherwise MOC is more precise.
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