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| DOI：10.13522/j.cnki.ggps.20190136 |
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| Parameter Sensitivity Analysis of Water Head Loss Calculation of 90° Curved Pipe Based on CFD |
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LIU Fei, HE Jiaoyun, LONG Zhenhua
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Hubei Water Resources Technical College, Wuhan 430070, China
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| Abstract: |
| Computational Fluid Dynamics (CFD) has been widely used in the water conservancy industry. 【Objective】 In order to optimize CFD modeling scheme of 90°curved tube. The sensitive factors which have important influence on CFD modeling were found out from a number of uncertain factors, while their impacts on the simulation results were analyzed. 【Method】 The effects of grid size, turbulence model, water density, dynamic viscosity and roughness height on the results were analyzed by single factor analysis.【Result】The relative error between the CFD result and the empirical coefficient calculation result was within 5%, which showed that the turbulent flow state of the bending pipe could be effectively simulated by the RNG [k-ε] turbulence model. The less computing resources were required in those cases which using this turbulence model. When the temperature of the water was higher than 15 ℃, the water density and dynamic viscosity could be corrected for precision. The water density and dynamic viscosity had less impact on the simulation results of hydraulic smooth pipe. 【Conclusion】In the simulation calculation of project cases, a number of various factors, for example the shape of model, characteristics of pipeline materials, water temperature and so on, should be considered seriously. The accurate results can be obtained when the suitable parameters are set in the model. |
| Key words: 90° curved tube; water head loss; grid size; turbulence model; dynamic viscosity; roughness height |
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