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陈家军,解建波.边界元法在填埋场气体运移数值模拟中的应用[J].环境科学学报,2008,28(10):2141-2147
边界元法在填埋场气体运移数值模拟中的应用
- Application of boundary element method in numerical modeling of landfill gas migration
- 基金项目：高等学校博士学科点专项基金(No.20050027002104012)
- 作者
- 单位
- 陈家军
- 环境模拟与污染控制国家重点联合实验室/北京师范大学, 北京 100875
- 解建波
- 环境模拟与污染控制国家重点联合实验室/北京师范大学, 北京 100875
- 摘要：基于多孔介质流体动力学理论和边界元法原理,构建了填埋气运移边界元数值模型,进行填埋场内部填埋气的运动规律研究;通过与理想条件下的解析解对比分析,检验了该边界元数值模型方法本身;进行了垂直抽气井设施的填埋场实例气体运动数值模拟,得到了填埋场内部填埋气体的压力分布情况,由此确定了集气井的影响范围.模型精度分析和模型验证结果表明,该模型与解析解的平均相对误差在3%以下,与实测数据的平均相对误差均在10%左右,具有较高的精度;抽气井模拟结果表明,该模型可应用于填埋场气体运移的模拟预测和现场分析,能够为填埋场释放气体控制系统设计和优化提供理论依据.
- Abstract：Based on the theory of fluid dynamics in porous media and the Boundary Element Method(BEM),a numerical model of BEM was established to investigate the mechanisms of Landfill Gas(LFG) migration within a landfill site.The model was validated through comparison of the resultant numerical solution with the analytical solution under ideal conditions.Numerical modeling of LFG migration with a vertical extraction well was conducted.Gas pressure distribution within the landfill site was obtained;subsequently,the radius of influence of the extraction well was determined.The results of accuracy analysis showed good accuracy for the model with average relative errors of less than 3% and approximately 10% compared with the analytical solution and in-situ monitored data,respectively.The good accuracy indicates that the model can be applied in prediction of in-situ LFGmigration and can provide a theoretical basis for landfill gas control system design and optimization.
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