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              <p>In numerous non stationary and non linear problems, the determination of the time step necessary to the good sequence of simulation of finite elements is very often tedious. We propose, therefore, a strategy of autoadaptive steps and we apply it to a resolution by finite elements of diffusion equations. After an analysis of the method principles on simple cases, we resolve two problems of strongly non linear diffusion, in order to show the efficiency of such an approach. The first one consists in the simulation of polymerisation of a composite structure (thermochemical coupling) and the second consists in the simulation of the filling of a soil barrage (runoff in an undeformable porous non-saturated environment).</p>
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