BEM computation of 3D Stokes flow including moving front

The main advances in the modeling and simulation of the filling phenomenon that takes place in dual-scale fibrous reinforcements used in liquid composites molding processes are grouped and classified in the present work. Special emphasis is done in the classification of the simulation methods according to the dimension of the mesh, the identification of the interface conditions porous medium-free fluid, the comparison between the most used fluid-front tracking techniques and the survey of researches dealing with the non-uniform filling of representative unitary cells, which in turn is responsible for the void formation at mesoscopic scale and the sink effect at macroscopic scale. As an original contribution to this field of study, a new methodology to quantify the sink effect in macroscopic fillings is presented and subsequently assessed by comparing the results of experimental radial injections with numerical results obtained by the dual reciprocity-boundary element method. The proposed methodology is physically consistent and leads to results that are closer to the experimental ones than the results obtained when the sink effect is neglected; however, the accuracy is liable to be improved.

Section: Numerical Techniques To Track the Fluid Frontmentioning

confidence: 99%

Modeling and simulation of filling in dual-scale fibrous reinforcements: state of the art and new methodology to quantify the sink effect

Patiño-Arcila

Vanegas-Jaramillo

2017

“…Thai et al. 1 explored the resin flow at macro-scale by boundary element method, whereas Pillai 2 considers the void formation by introducing a sink term to the classical Darcy's law and develops it to implement the simulation. At meso-scale, Park et al.…”

Section: Introductionmentioning

confidence: 99%

“…Generally, at macro-scale most researchers consider the fiber reinforcement as a whole porous medium. Thai et al 1 explored the resin flow at macro-scale by boundary element method, whereas Pillai 2 considers the void formation by introducing a sink term to the classical Darcy's law and develops it to implement the simulation. At mesoscale, Park et al 3 takes the flow at fibrous scale into account to discuss the void formation.…”

Section: Introductionmentioning

confidence: 99%

A study on resin infusion and effects of reinforcement structure at dual scales by a quasi-realistic numerical simulation method

Cantarel

Gong

2020

In this article, we propose a random fiber configuration method to set up quasi-realistic geometric models of the fibrous tow in reinforcement. Finite element method is applied to simulate the injection of resin at dual scales (both intra and inter tows, 2D and 3D models). Permeabilities of dual scales in three directions (in horizonal, vertical and longitudinal directions) are also explored. The influence of variant structure parameters on the permeability is discussed in the meantime. Flow front tracking considering surface tension effect based on the dual-scale model is carried out to predict resin flow through the fibrous reinforcement.

Influence of structural parameters at microscale on the fiber reinforcement

Cantarel

Gong

2018

In this paper, a random configuration model for fiber arrangement is proposed and implemented in a computer code. This development enables the investigation of the effect of the random arrangements of the fibers inside the tow on the permeability and the flow properties. Four parameters are considered including three microstructural parameters: side length of the domain L, variation of radii Δ r, minimum interfiber distance δmin, and one macro parameter: porosity ɛ. Finite element method is performed for the transverse flow of porous media with random arrangements of fibers. Morris method for global sensitivity analysis is used to study the influence of four parameters. The results have shown that the porosity ɛ has the most obvious influence on the fiber reinforcement permeability.