12 papers
RheOPT: Few-Shot Non-Newtonian Flow Prediction via Newtonian Pretraining of RheOFormer
Maedeh Saberi, Amir Barati Farimani, Safa Jamali
Despite advances in numerical methods, non-Newtonian flow simulations remain computationally expensive because velocity and stress must be advanced together through rate- and histo…
Rheology and Dynamic Arrest in Colloidal Depletion Gels Mediated by Surface Brush Density
Ziye Zhuang, Robert A. Campbell, Safa Jamali +1
We use the density of surface-grafted polymers as a geometry-preserving control parameter for tuning the rheology of colloidal depletion gels. Reducing brush density accelerates ge…
Size matters more than packing in bimodal colloidal gel compositions
Robert A. Campbell, Ziye Zhuang, Ali Mohraz +1
Colloidal gels are frequently modeled as monodisperse particle networks, although practical formulations commonly contain particles with multiple characteristic sizes. Here, we use…
Bimodal colloids highlight the structural mirror of rigidity percolation and yielding
Robert A. Campbell, Ziye Zhuang, Ali Mohraz +1
In metastable particulate gels, it is tempting to believe that the dynamic similarities between the fluid-to-solid non-linear phase transition of rigidity percolation and the solid…
Isosbestic points in time resolved SAXS: from spectroscopic analogy to model free structural markers during colloidal gelation
Alain Gibaud, Wilbert J. Smit, Safa Jamali +1
Gelation is the transition from a fluid state into a system-spanning, out of equilibrim soft-solid network through a hierarchical process that couples local particle interactions t…
Shear-Induced Structural Convergence but Formation-History-Dependent Yielding in Sequentially Gelled Binary Colloidal Networks
Alexander Kaltashov, Safa Jamali
Multicomponent colloidal gels can exhibit mechanical responses that depend not only on interaction strengths but also on the temporal pathway by which their networks form. Here, we…
Hierarchical Multi-Fidelity Learning for Predicting Three-Dimensional Flame Wrinkling and Turbulent Burning Velocity
Saghar Zolfaghari, Yu Xie, Junfeng Yang +1
High-fidelity experimental characterization of turbulent premixed flames remains limited by the cost and complexity of advanced diagnostics, particularly under elevated pressures a…
From Double Colloidal Networks to Core-Shell and Mixed Composites through Sequential Gelation
Alexander Kaltashov, Safa Jamali
Multicomponent gel systems have garnered much interest due to their compelling mechanical properties in the past decade. Yet, some mechanisms associated with multicomponent gels, s…
Brush-mediated angular constraints reshape structure, rigidity, and percolation in colloidal depletion gels
Ziye Zhuang, Robert A. Campbell, Paniz Haghighi +2
Colloidal gels, like many other soft and disordered solids derive their mechanical properties not only from the strength of interparticle attraction, but also from the symmetry of…
Non-local physics-informed neural networks for forward and inverse solutions of granular flows
Saghar Zolfaghari, Safa Jamali
Dense granular flows exhibit nonlocal effects due to stress transmission in microplastic events, especially in quasi-static or slowly sheared regions. Hence, traditional local rheo…
A Minimal Nonlocal Theory of Thixotropic Flow
Saghar Zolfaghari, Safa Jamali
Dense amorphous materials exhibit both nonlocal flow cooperativity and pronounced history dependence, yet existing continuum models capture only one of these features at a time. No…
RheOFormer: A generative transformer model for simulation of complex fluids and flows
Maedeh Saberi, Amir Barati Farimani, Safa Jamali
The ability to model mechanics of soft materials under flowing conditions is key in designing and engineering processes and materials with targeted properties. This generally requi…