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Mass Conservation Enhancement of Free Boundary Mesolevel Flows during LCM Processes of Composites Manufacturing
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Resumo(s)
Undesirable void formation during the injection phase of the liquid composite
moulding process can be understood as a consequence of the non-uniformity of the
flow front progression, caused by the dual porosity of the fibre perform. Therefore
the best examination of the void formation physics can be provided by a mesolevel
analysis, where the characteristic dimension is given by the fibre tow diameter. In
mesolevel analysis, liquid impregnation along two different scales; inside fibre tows
and within the open spaces between them; must be considered and the coupling
between these flow regimes must be addressed. In such case, it is extremely
important to account correctly for the surface tension effects, which can be modelled
as capillary pressure applied at the flow front. Numerical implementation of such
boundary conditions leads to ill-posing of the problem, in terms of the weak
classical as well as stabilized formulation. As a consequence, there is an error in
mass conservation accumulated especially along the free flow front. This
contribution presents a numerical procedure, which was formulated and
implemented in the existing Free Boundary Program in order to significantly reduce
this error.
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Palavras-chave
void formation, surface tension, capillary pressure, mass conservation, free boundary flow, mesolevel analysis, dual porosity