Encontrados 11 documentos, a visualizar página 1 de 2
Combustion Characteristics of Premixed Hydrogen/Air in an Undulate Microchannel
Resende, Pedro R.; Morais, Leandro C. [UNESP]; Pinho, Carlos; Afonso, Alexandre M.Made available in DSpace on 2022-04-28T19:49:39Z (GMT). No. of bitstreams: 0 Previous issue date: 2022-01-01; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); This work reports a numerical investigation of microcombustion in an undulate microchan-nel, using premixed hydrogen and air to understand the effect of the burner design on the flame in order to obtain stability of the flame. The simulation...
Numerical study of the square-root conformation tensor formulation for confined...
Palhares Junior, Irineu L. [UNESP]; Oishi, Cassio M. [UNESP]; Afonso, Alexandre M.; Alves, Manuel A.; Pinho, Fernando T.Made available in DSpace on 2022-04-29T07:50:09Z (GMT). No. of bitstreams: 0 Previous issue date: 2016-12-01; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); European Research Council; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Fundação para a Ciência e a Tecnologia; We present a numerical study of a stabilization method for computing confined and free-surface flows of ...
Numerical study of hydrodynamic resistance on a sportive sprint hull
Barros, Francisco; Viriato, Nuno; Veiga Rodrigues, Carlos; Ferrás, Luís Jorge Lima; Vaz, Mário A. P.; Afonso, Alexandre M.In this work we perform a numerical study on the flow around the hulls of competition kayaks with the aim of predicting accurate drag forces. The numerical simulations were first performed using the Wigley hull geometry, a typical validation case for flows around marine vessels. The total drag force and wave profiles of the hull were determined for different Froude numbers and compared with experimental measure...
Hydrodynamic entrance length for laminar flow in microchannels with rectangular...
Ferreira, Germán; Sucena, Artur; Ferrás, Luís Jorge Lima; Pinho, Fernando T.; Afonso, Alexandre M.This work presents a detailed numerical investigation on the required development length (L=L/B) in laminar Newtonian fluid flow in microchannels with rectangular cross section and different aspect ratios (AR). The advent of new microfluidic technologies shifted the practical Reynolds numbers (Re) to the range of unitary (and even lower) orders of magnitude, i.e., creeping flow conditions. Therefore, accurate e...
Development length of fluids modelled by the gPTT constitutive differential equ...
Bertoco, Juliana; Leiva, Rosalía T.; Ferrás, Luís Jorge Lima; Afonso, Alexandre M.; Castelo, AntonioIn this work, we present a numerical study on the development length (the length from the channel inlet required for the velocity to reach 99% of its fully-developed value) of a pressure-driven viscoelastic fluid flow (between parallel plates) modelled by the generalised Phan–Thien and Tanner (gPTT) constitutive equation. The governing equations are solved using the finite-difference method, and, a thorough ana...
Flow structures identification through proper orthogonal decomposition: The flo...
Ribau, Ângela M.; Gonçalves, Nelson D.; Ferrás, Luís Jorge Lima; Afonso, Alexandre M.Numerical simulations of fluid flows can produce a huge amount of data and inadvertently important flow structures can be ignored, if a thorough analysis is not performed. The identification of these flow structures, mainly in transient situations, is a complex task, since such structures change in time and can move along the domain. With the decomposition of the entire data set into smaller sets, important str...
Numerical study on micro-scale extensional viscoelastic flows
Figueiredo, Rafael A.; Oishi, Cassio M. [UNESP]; Afonso, Alexandre M.; Alves, Manuel A.Made available in DSpace on 2020-12-10T19:50:16Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-02-01; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); CEFT (Centro de Estudos de Fenomenos de Transporte); FEDER funds through COMPETE2020 - Programa Operational Competitividade e Intemacionalizacao (POCI); FCT - Fundacao par...
NUMERICAL INVESTIGATION OF THREE DIMENSIONAL VISCOELASTIC FREE SURFACE FLOWS: I...
Figueiredo, Rafael A.; Oishi, Cassio M. [UNESP]; Cuminato, Jose A.; Azevedo, Jose C.; Afonso, Alexandre M.; Alves, Manuel A.; Onate, E.; Oliver, XMade available in DSpace on 2020-12-10T19:35:43Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-01-01; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); This work presents a numerical investigation of three dimensional viscoelastic free surface flows. In particular, using two different numerical methodologies, we have simu...
An improved k-ε turbulence model for FENE-P fluids capable to reach high drag r...
Resende, Pedro Miguel Rebelo; Afonso, Alexandre M.; Cruz, Daniel Onofre de AlmeidaSubmitted by Jairo Amaro (jairo.amaro@sibi.ufrj.br) on 2019-06-03T14:38:18Z No. of bitstreams: 1 3-2018_An-improved-ke-turbulence-model--min.pdf: 552740 bytes, checksum: 1949a7ca4ebf4d68bf1bd6520d23974c (MD5); Made available in DSpace on 2019-06-03T14:38:18Z (GMT). No. of bitstreams: 1 3-2018_An-improved-ke-turbulence-model--min.pdf: 552740 bytes, checksum: 1949a7ca4ebf4d68bf1bd6520d23974c (MD5) Previous issue ...
Semi-analytical solutions for the poiseuille-couette flow of a generalised Phan...
Ribau, Angela M.; Ferrás, Luís Jorge Lima; Morgado, Maria L.; Rebelo, Magda; Afonso, Alexandre M.This work presents new analytical and semi-analytical solutions for the pure Couette and Poiseuille-Couette flows, described by the recently proposed (Ferras et al., A Generalised Phan-Thien-Tanner Model, JNNFM 2019) viscoelastic model, known as the generalised Phan-Thien-Tanner constitutive equation. This generalised version considers the Mittag-Leffler function instead of the classical linear or exponential f...