Calculation of Sensivity to Parameters in Single-Phase Natural Circulation Flows Using ADIFOR

Abstract

An automatic technique to get the sensitivity of a margin to instability in natural circulation flows with respect to physical and discretization parameters has been developed. It is based on the use of a tool for the automatic differentiation of FORTRAN codes. ADIFOR was the tool adopted to get the derivatives of model variables with respect to model parameters. In this paper, we present an alternative, simpler, procedure to the authors' previous analysis. It is based in obtaining the Jacobeans derivatives automatically. This procedure gives results coincident with the previous ones, allowing for obtaining the desired sensitivities in a somewhat complex problem. It is worth pointing out that the procedure is general enough and may also be applied to other problems.