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                <term xml:lang="en">support function</term>
                <term xml:lang="en">convex domain</term>
                <term xml:lang="en">cost functional</term>
                <term xml:lang="en">optimal solution</term>
                <term xml:lang="en">shape derivative</term>
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              <p>This paper is devoted to a numerical method for the approximation of a class of free boundary problems of Bernoulli's type, reformulated as optimal shape design problems with appropriate shape functionals. We show the existence of the shape derivative of the cost functional on a class of admissible domains and compute its shape derivative by using the formula proposed in [5, 6], that is, by means of support functions. On the numerical level, this allows us to avoid the tedious computations of the method based on vector fields. A gradient method combined with boundary element method are performed for the approximation of this problem, in order to overcome the re-meshing task required by the finite element method. Finally, we present some numerical results and simulations concerning practical applications, showing the effectiveness of the proposed approach.</p>
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