Computational fluid dynamics modeling of post-liquefaction soil flow using the volume of fluid method

Abstract

Flow deformation of post-liquefaction soil during an earthquake can cause serious damage to engineering structures. To overcome the limitations of conventional deformation analysis methods based on solid mechanics for extremely large systems, a computational fluid dynamics (CFD) method is proposed to numerically simulate the flow behavior of post-liquefaction soil. The liquefied soil is assumed to be a viscous fluid, and the volume of fluid (VOF) model is used for interface tracking in the numerical scheme. The results of a modeling test conducted on liquefaction-induced ground flow to verify the validity of the method showed good agreement, indicating the proposed method is capable of being used to reproduce the flow behavior of post-liquefaction soil.Keywords Soil liquefaction Á Flow failure Á Earthquake Á Computational fluid dynamics Á Volume of fluid method Résumé Les écoulements après liquéfaction de sols pendant un séisme peuvent causer de sérieux dommages aux ouvrages. Afin de surmonter les limitations des méth-odes conventionnelles d'analyse des déformations basées sur la mécanique des solides appliquée à des grands systèmes, une méthode numérique de dynamique des fluides (CFD) est proposée pour simuler numériquement l'écoulement après liquéfaction du sol. Le sol liquéfié est supposé être un fluide visqueux et le modèle du volume de fluide (VOF) est utilisé pour suivre les interfaces dans le schéma numérique. Les résultats d'un test de modélisation, destiné à vérifier la validité de la méthode et réalisé à partir d'un écoulement de terrain consécutif à un processus de liquéfaction, ont permis de conclure que la méthode proposée peut être utilisée pour reproduire le comportement du sol après liquéfaction.Mots clés Liquéfaction de sol Á Ecoulement Á Séisme Á Dynamique des fluides Á Modélisation Á Méthode du volume de fluide

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