Method of finite elements, or, elements limited that briefly FEM called, the way is numerically to solve the approximate differential equations, partial and also solved the integral. Based on this method, or the complete removal of the differential equations or simplify them to ordinary differential equations, with numerical methods like Euler's solution..... In solving the differential equations minor issue is that the simple equation that in terms of numerical - that is, the error in initial data during the solve so much, not that the results, not the concept of lead - questions. Ways with various advantages and disadvantages to this, there is method components Limited is one of the best them. This method solve Differential Equations, partial on the domain of the complex (such as vehicles and tube, transfer, oil), or when the amplitude is variable, or when high accuracy everywhere in the domain is not required or if the results of the correlation and uniformity enough. very useful. For example, in the simulation of a crash in the front part of the car, need to the accuracy of the results at the rear of the car. also in the simulation and forecast of air on earth, etc., on the drought, more important, on the seas.