For the three-dimensional compressible multicomponent displacement problem we put forward the modified method of characteristics with finite element operator-splitting procedures and make use of operator-splitting,characteristic method,calculus of variations,energy method,negative norm estimate,two kinds of test functions and the theory of prior estimates and techniques.Optimal order estimates in L^2 norm are derived for the error in the approximate solution.These methods have been successfully used in oil-gas resources estimation,enhanced oil recovery simulation and seawater intrusion numerical simulation.
For the three-dimensional compressible multicomponent displacement problem we put forward the modified method of characteristics with finite element operator-splitting procedures and make use of operator-splitting, characteristic method, calculus of variations, energy method, negative norm estimate, two kinds of test functions and the theory of prior estimates and techniques. Optimal order estimates in L2 norm are derived for the error in the approximate solution. These methods have been successfully used in oil-gas resources estimation, enhanced oil recovery simulation and seawater intrusion numerical simulation.