Numerical analysis of roll waves generation on non-Newtonian fluids flowing down an inclined plane

• Autor(a) principal: de Oliveira Ferreira, Fabiana [UNESP]
• Data de Publicação: 2014
• Outros Autores: de Freitas Maciel, Geraldo [UNESP], Fiorot, Guilherme Henrique, da Cunha, Evandro Fernandes [UNESP]
• Tipo de documento: Artigo de conferência
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.4028/www.scientific.net/AMR.1006-1007.160; http://hdl.handle.net/11449/167654
• topic: Mudflows; Non-Newtonian fluid; Risks; Roll waves

This article aims to determine roll waves generation criteria for mudflow events. A representative system of equations to mudflows is reached through Cauchy's equations (mass and momentum conservation) with proper stress tensor (non-Newtonian fluid) in shallow water conditions. Linear stability analysis is then applied to the system and two roll waves generation criteria are found: one related to Froude number and another related to flow disturbance frequency. Numerical simulations for both Newtonian and non-Newtonian fluids were carried. Good agreement was observed between numerical results and theoretical criteria. © (2014) Trans Tech Publications, Switzerland.