20.500.12556/DKUM-92849 Ellipsoidal soft micro-particles suspended in dilute viscous flow Soft particles in viscous flows are prevalent both in nature and in various industrial applications. Notable examples include biological cells such as blood cells and bacteria as well as hydrogels and vesicles. To model these intriguing particles, we present an extension of our recent, efficient, and versatile pseudo-rigid body approach, originally developed for initially spherical soft particles suspended in arbitrary macroscale viscous flows. The novel extension allows modeling the barycenter and shape dynamics of soft initially non-spherical, i.e. ellipsoidal particles by introducing a novel shape and orientation tensor. We consider soft, micrometer-sized, ellipsoidal particles deforming affinely. To this end, we combine affine deformations (as inherent to a pseudo-rigid body) and the Jeffery-Roscoe model to analytically determine the traction exerted on a soft ellipsoidal particle suspended locally in a creeping flow at the particle scale. Without loss of generality, we assume nonlinear hyperelastic material behavior for the particles considered. The novel extension of our recent numerical approach for soft particles demonstrates that the deformation and motion of the particles can be accurately reproduced also for ellipsoidal particles and captures results from the literature, however, at drastically reduced computational costs. Furthermore, we identify both the tumbling and trembling dynamic regime for soft ellipsoidal particles suspended in simple shear flow again capturing results from the literature. Our extended approach is first validated using experimental and numerical studies from the literature for quasi-rigid as well as soft particles, followed by a comparison of the effects of particle deformability for some well-known fluid flow cases, such as laminar pipe flow, lid-driven cavity flow, and a simplified bifurcation. We find that taking particle deformability into account leads to notable deviations in the particle trajectory compared to rigid particles, with increased deviations for higher initial particle aspect ratio. Furthermore, we demonstrate that our approach can track a statistically relevant number of soft particles in complex flow situations. soft particles Lagrangian particle tracking pseudo-rigid bodies point-particle method mehki delci Lagrangevo sledenje delcev psevdotogo telo metoda točk in delcev true false true Elsevier Angleški jezik Slovenski jezik https://www.sciencedirect.com/science/article/pii/S0045782525002452?via%3Dihub Članek v reviji 2025-05-19 14:50:41 2025-05-19 14:50:42 2025-05-20 03:15:22 0000-00-00 00:00:00 2025 0 0 23 str. Vol. 441, [article no.] 117973 June 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2025-03-20 2025-03-25 2025-04-18 532:519.6 236384259 10.1016/j.cma.2025.117973 1879-2138 1-s2.0-S0045782525002452-main.pdf 1-s2.0-S0045782525002452-main.pdf 1 DCBB6FCDE4E4810462BB01238F1B1BAF 2a7a47408a9ea4dd213f7cc0d685694603035539740b5c9fcc2f3199b0bf34d9 5dcb50c1-34b0-11f0-ad3e-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=191104 https://www.sciencedirect.com/science/article/pii/S0045782525002452?via%3Dihub 0 67d81ebf-34b0-11f0-ad3e-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=191106 Fakulteta za strojništvo 0 0 0