管廊管道泄漏数值模拟网格敏感性分析  

The Grid Sensitivity Analysis of Numerical Simulation for Gas Pipeline Leakage in Utility Tunnels

作　　者：周圣果 李明 Shengguo Zhou;Ming Li(Nanning Urban Construction Investment Group Co.,Ltd.,Nanning Guangxi;School of Environment and Architecture,University of Shanghai for Science and Technology,Shanghai)

机构地区：[1]南宁城市建设投资集团有限责任公司,广西南宁 [2]上海理工大学环境与建筑学院,上海

出　　处：《建模与仿真》2025年第3期524-531,共8页Modeling and Simulation

基　　金：国家自然科学基金资助项目(42077435,42377171);2022年南宁市科学研究与技术开发计划项目(ZC20223242)。

摘　　要：为研究地下综合管廊中天然气泄漏扩散的行为特性,以南宁市新邕路综合管廊燃气舱防火分区9为研究对象,建立了三维CFD模型,并利用ANSYSFluent软件对燃气泄漏过程进行了数值模拟。通过与试验数据对比验证了模型的可靠性与准确性。在此基础上,进行了网格敏感性分析,对五种不同网格划分方案(406,972至587,419个网格)进行了评估。研究发现,当网格数量达到468,668时,各监测点的甲烷浓度变化曲线在全时间范围内基本一致,进一步细化网格对结果影响有限,证明该网格方案在保证精度的同时有效平衡了计算效率。同时,还从扩散初期(0~15秒)和长期稳定阶段(>15秒)对气体浓度变化的敏感性进行了深入分析。结果显示,靠近泄漏源区域对网格划分更为敏感,而远离泄漏源区域的浓度变化趋势相对平稳。研究表明,该CFD模型能够可靠地捕捉复杂环境下气体泄漏与扩散的特性,可为综合管廊的安全设计与风险评估提供技术支持。To investigate the behavioral characteristics of natural gas leakage and diffusion in underground utility tunnels,this study takes Fire Compartment 9 of the gas chamber in the Nanning Xin Yong Road utility tunnel as the research object.A three-dimensional CFD model was established,and numerical simulations of the gas leakage process were conducted using ANSYS Fluent software.The model was validated by incorporating experimental data,demonstrating that the relative error between simulated and experimental data was less than 10%,thus confirming the reliability and accuracy of the model.A grid independence analysis was subsequently performed,evaluating five grid division schemes ranging from 406,972 to 587,419 cells.The results revealed that when the grid count reached 468,668,the methane concentration curves at all monitoring points remained consistent over the entire time range,and further grid refinement had minimal impact on the results.This finding indicates that this grid scheme effectively balances accuracy and computational effi-ciency.Furthermore,the sensitivity of gas concentration changes was analyzed in depth during the early diffusion phase(0~15 seconds)and the long-term stabilization phase(>15 seconds).The re-sults showed that regions near the leakage source were more sensitive to grid resolution,while concentration trends in areas further from the source were relatively stable.This study demonstrates that the CFD model reliably captures the characteristics of gas leakage and diffusion in complex en-vironments and provides technical support for the safety design and risk assessment of utility tunnels.

关 键 词：管廊 天然气 泄漏 计算流体力学 网格无关性 

分 类 号：TU996.8[建筑科学—供热、供燃气、通风及空调工程]