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Combined Eulerian-PFEM approach for analysis of polymers in fire situations
The solution strategy based on the coupling of particle finite element method (PFEM) with a compressible Eulerian solver equipped with the DOM for radiation modeling is a powerful technique to model the behavior of the melting and dripping of polymer-made objects in fire situations. While inheriting advantages of PFEM for modeling the polymer, the proposed methodology permits to efficiently model temperature evolution in the ambience (air) and the heat exchange between air and polymer. The method also allows to track the motion of the polymer particles as they melt, flow over the surface of the object, and fall toward and on the underlying floor. In this paper, we have emphasized an aspect related to the numerical approximation of the thermal coupling between air and polymer. The heat equation was solved within both the subdomains (the air and the polymer), whereas the radiative transport equation was considered exclusively in the air. The heat exchange at the interface is ensured by calculating the radiant heat flux and imposing it as a natural boundary condition. The capability of the model to simulate a polymer melting experiment performed at National Institute of Standards and Technology that is characterized by unsteady heat transfer flow because of natural convection, conduction, and radiation was demonstrated. The comparison of the obtained numerical results with the experimental ones was very encouraging, proving the applicability of the proposed methodology in the field of interest.
Combined Eulerian-PFEM approach for analysis of polymers in fire situations
The solution strategy based on the coupling of particle finite element method (PFEM) with a compressible Eulerian solver equipped with the DOM for radiation modeling is a powerful technique to model the behavior of the melting and dripping of polymer-made objects in fire situations. While inheriting advantages of PFEM for modeling the polymer, the proposed methodology permits to efficiently model temperature evolution in the ambience (air) and the heat exchange between air and polymer. The method also allows to track the motion of the polymer particles as they melt, flow over the surface of the object, and fall toward and on the underlying floor. In this paper, we have emphasized an aspect related to the numerical approximation of the thermal coupling between air and polymer. The heat equation was solved within both the subdomains (the air and the polymer), whereas the radiative transport equation was considered exclusively in the air. The heat exchange at the interface is ensured by calculating the radiant heat flux and imposing it as a natural boundary condition. The capability of the model to simulate a polymer melting experiment performed at National Institute of Standards and Technology that is characterized by unsteady heat transfer flow because of natural convection, conduction, and radiation was demonstrated. The comparison of the obtained numerical results with the experimental ones was very encouraging, proving the applicability of the proposed methodology in the field of interest.
Combined Eulerian-PFEM approach for analysis of polymers in fire situations
Marti, J. (Autor:in) / Ryzhakov, P. (Autor:in) / Idelsohn, S. (Autor:in) / Onate, E. (Autor:in)
International Journal for Numerical Methods in Engineering ; 92 ; 782-801
2012
20 Seiten, 16 Bilder, 1 Tabelle, 34 Quellen
Aufsatz (Zeitschrift)
Englisch
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