ИСТИНА

Voids in composite materials strongly affect the physical and mechanical properties. At the same time, modeling and simulation of resin flow require substantial computational resources of current commercial and research computational fluid dynamics tools because of the presence of a vast range of physical scales that need to be resolved: fibers with 10 µm in diameter, bundles of fibers (tows) with 1 mm, composites with sizes more than 10 cm, and bubbles with a wide range of diameters. To study the mechanisms of porosity formation, a computational program has been developed for dual-scale textiles in liquid composite molding. The physical process of impregnation is described by the incompressible Stokes equations for multiphase flow in a porous medium considering the effects of surface tension. If the data compression is sufficiently large to compensate the extra computational cost, then Adaptive Multiresolution refinement techniques become efficient. They have a rigorous and more precise regularity analysis and an error estimator criterion in comparison with Adaptive Mesh Refinement approaches used in most commercial software. The model is implemented on the parallel open-source BASILISK software with adaptive mesh generation, which uses tree-based grids and thresholding of the wavelet coefficients. Numerical results are obtained for saturated and unsaturated liquid flow with bubbles through a porous medium for different wettability: non-wetting and perfect wetting fibers.