A hyperbolic model for convection-diffusion transport problems in CFD: Numerical analysis and applications

نویسندگان

  • H. Gómez
  • I. Colominas
  • F. Navarrina
  • M. Casteleiro
چکیده

In this paper we present a numerical study of the hyperbolic model for convection-diffusion transport problems that has been recently proposed by the authors [16]. This model avoids the infinite speed paradox, inherent to the standard parabolic model and introduces a new parameter τ called relaxation time. This parameter plays the role of an “inertia” for the movement of the pollutant. The analysis presented herein is twofold: first, we perform an accurate study of the 1D steady-state equations and its numerical solution. We compare the solution of the hyperbolic model with that of the parabolic model and we analyze the influence of the relaxation time on the solution. On the other hand, we explore the possibilities of the proposed model for real-world applications. With this aim we solve an example concerning the evolution of a pollutant being spilled in the harbor of A Coruña (northwest of Spain, EU). Un modelo hiperbólico para problemas de convección-difusión en mecánica de fuidos computacional: Análisis numérico y aplicaciones Resumen. En este artı́culo se presenta un estudio numérico del modelo hiperbólico para problemas de convección-difusión que ha sido recientemente propuesto por los autores [16]. Este modelo elimina la paradoja del transporte a velocidad infinita inherente al modelo parabólico e introduce un nuevo parámetro τ denominado tiempo de relajación. Este parámetro introduce una “inercia” en el movimiento del contaminante. El artı́culo tiene dos objetivos: en primer lugar se realiza un detallado análisis de las ecuaciones estacionarias 1D y su solución numérica. Se compara la solución del modelo hiperbólico con la del modelo parabólico y se analiza la influencia del tiempo de relajación en la solución. El segundo objetivo es estudiar las posibilidades del modelo propuesto para aplicaciones prácticas. Para ello, se simula la evolución de un vertido contaminante en el puerto de A Coruña.

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تاریخ انتشار 2008