Numerical Analysis of the Laminar Pulse Flow within Fractures with Penetrable Walls

摘要

In many geological structures, the permeability or penetrability of stone matrix is negligible compared to stone fracture. In fact, fractures are the main direction of flow in stone massifs. As a result of improving the efficiency of design studies; implementation of barefaced underground structures; separation of carbon dioxide in underground brines; disposal of nuclear waste and investigation of the behavior of the current within the fracture is considered as a crucial research project. The present study elaborates on a calculative model for single-phase flow in a fractured environment in a special situation. The geometry of the fracture under study is obtained through a series of Ct-scans from real fractures in Berea sandstone. The Ansys-Fluent Software analyses the flow within a fracture with flow rate of 0.312-31.2 mm~2/sec and width and permeability unit of 500 mm Darcy and through application of pulse-sine input rate. Flow condition and pressure drop calculated in this study are compared with a simulation of walls of an impenetrable fracture. The calculated fracture range is produced through a two dimensional stone matrix. Furthermore, laminar flow is calculated for several input rates. The pressure drop within the fracture is used to describe the relationship between flow rate and pressure drop resulting from flow.