Physics – Classical Physics
Scientific paper
2007-04-23
Comptes Rendus M\'ecanique 334, 3 (2006) 183-189
Physics
Classical Physics
Scientific paper
10.116/j.crme.2006.011
We consider the stability of a porous medium submitted to a steady-state flow with free-boundary. Assuming some hypotheses, it is possible to implement the kinematic method by using an approximate pressure field bounding the true pressure field from below. We are interested in finding such approximate pressure fields and in proving that they bound the true pressure field from below without knowing the true pressure field. We use fields which are solutions of a problem with relaxed conditions with regard to the real problem. Under a uniqueness condition of the solution of a weak formulation of the problem, such fields are lower bounds for the true pressure field. Finally, we give the example of a vertical dam.
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