The 3D Reconstruction Of Porous Media And Liquid Animation Simulation

Many industrial applications involve fluid flow in porous media issues, such as low and lower permeable oil and gas field development, underground water mining, gas layer exploitation, metal materials production and so on. Establishing a set of software that can accurately reconstruct porous media's three dimensional model, and based on this model, extracting the pore network of porous media, simulating fluid flow in media's pore network through animation, not only can help people quickly and easily determine porous media's relevant physical parameters by computer experiments, but also can provide a very big help for studying how the porous media's spatial structure impacts on porosity flow. In terms of practical application and theoretical research, the subject has a very important research value. The work in this paper is to reconstruct porous media's three dimension model based on a series of fault slice images, and to simulate fluid flow in porous media through animation.In this paper, the research contents and results are as follows:1. Descript and analyse the research status of reconstructing porous media and simulating fluid flow by animation.2. Use three dimensional image reconstruction method to reconstruct porous media's spatial structure. Based on the characteristics of scanning instrument, use a series of image processing methods to remove background and filter noises in fault slice images, and combined with the relevant porous media knowledge to extend the porous media's contour in order to contain surface porosities, identify solid skeleton and pore space, extract valid pore network within the porous media.3. The distance between fault slice images maybe greater than the distance among pixels within a fault slice image. To avoid the compression phenomenon, based on the introduced interpolation algorithms in this paper, use the gray interpolation and the contour interpolation algorithms to get sandwich images. For the problem of extracting porous media's contour, combined with the porous media fault slice image characteristics, we propose an extraction algorithm based on double directional scanning.4. Use Marching cube(MC) algorithm to draw the fault slice images'three dimensional data field. Since the surface structure of porous media pore is complex, in order to accelerate the MC algorithm's running speed, we propose a modified MC algorithm based on region division technology, the running speed of this modified algorithm is faster than original MC algorithm.5. Introduce the SPH algorithm's basic theory and in order to promote the efficiency of looking for neighbor particles, we propose a region division method based on the coordinate transformation, through a numerical example we verify the new method's effectiveness.6. Original solid wall boundary treatments is not well adapted to the complex boundary conditions. To solve this problem, we propose a new treatment based on the interaction of particles and solid wall boundary. Through the simulation of water flow in rabbit complex container, we verify the validity of the new method, also through the simulation of classical dam break flow, after the comparison of numerical results between new method and original methods, we verify the numerical accuracy of the new method.7. Based on the simulation of fluid flow in a single pore network and porous media seepage, we analyse porous media spatial structure's impact on porosity flow and seepage.