Análise de estabilidade linear em plumas hipopicnais

Detalhes bibliográficos
Ano de defesa: 2016
Autor(a) principal: Farenzena, Bruno Avila lattes
Orientador(a): Silvestrini, Jorge Hugo lattes
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Pontifícia Universidade Católica do Rio Grande do Sul
Programa de Pós-Graduação: Programa de Pós-Graduação em Engenharia e Tecnologia de Materiais
Departamento: Faculdade de Engenharia
País: Brasil
Palavras-chave em Português:
Área do conhecimento CNPq:
Link de acesso: http://tede2.pucrs.br/tede2/handle/tede/6729
Resumo: Density currents initiate when two fluids of different densities come into contact, allowing relative movement between them. Differences in density usually are caused by temperature, salinity concentration, the presence of particles, among others.When these two fluids in addition to having different densities have different diffusive properties it is said that double diffusivity exists. This work aims at the investigation, through linear stability theory, of how the density currents instabilities that develop from particle deposition effects and double diffusivity can influence the transition to turbulence. A computer code, designed in Julia language, was initially validated with results avaiable in the literature. Subsequently, results were obtained for the two conditions cited above, they show critical values related to the particle size at which the flow is always unstable and also on the relationship of critical values between diffusive properties where double diffusivity does not interfere with instabilities development.