Planar Oldroyd-B and Giesekus jet flow stability: Convective and absolute instability analysis
The stability of viscoelastic jets is essential for industrial processes like printing and coating, but the choice of fluid model can yield vastly different predictions. This study investigates how the popular Oldroyd-B and Giesekus models affect the onset of convective instability, where disturbances grow downstream, versus absolute instability, where they grow locally. We demonstrate a key trade-off: Giesekus jets are more convectively unstable, while Oldroyd-B jets are more prone to absolute instability. These findings clarify how different fluid properties govern distinct instability pathways, guiding better process control.
Authors
- Leandro Franco de Souza (ORCID: https://orcid.org/0000-0002-6145-9443)
- Rafael L. Sterza (ORCID: https://orcid.org/0000-0003-0808-9874)
- Analice Costacurta Brandi (ORCID: https://orcid.org/0000-0002-0696-6629)
- André V. G. Cavalieri (ORCID: https://orcid.org/0000-0003-4283-0232)
- Márcio Teixeira de Mendonça (ORCID: https://orcid.org/0000-0002-6630-0749)
Institutions
- Instituto Tecnológico de Aeronáutica (BR)
- Universidade de São Paulo (BR)
- Instituto de Aeronáutica e Espaço (BR)
- Universidade Estadual Paulista (Unesp) (BR)
Publication Details
- Journal
- Physical Review Fluids
- Published
- 2025-08-26
- DOI
- https://doi.org/10.1103/rh44-3bmk
- Primary Topic
- Fluid Dynamics and Turbulent Flows
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Fundação de Amparo à Pesquisa do Estado de São Paulo
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
- Centro de Ciências Matemáticas Aplicadas à Indústria