Modeling & simulation of fluid-structure interactions across scales

In today's world, the modeling and simulation of complex systems span a wide range of disciplines, from biology and chemistry to engineering and beyond. Understanding these systems requires a multiscale approach that integrates knowledge from various levels of organization, from molecular interactions to macroscopic behavior. This approach is crucial for tackling challenges in diverse fields such as bioliquids, energy storage devices, and helicopter dynamics. In the realm of bioliquids, such as biomolecules and cellular components, multiscale modeling plays a pivotal role in unraveling the complexities of biological processes. From protein folding to membrane dynamics, researchers employ techniques ranging from atomistic simulations to coarse-grained models to capture the intricate interplay of molecules within cellular environments. These models not only enhance our fundamental understanding of biological systems but also have practical applications in drug design and personalized medicine. Similarly, the design and optimization of batteries demand a multiscale perspective to address issues ranging from electrode materials to system-level performance. Atomistic simulations provide insights into the behavior of ions and electrons within electrode materials, guiding the development of novel chemistries with enhanced energy storage capabilities. Meanwhile, continuum models facilitate the prediction of battery performance under various operating conditions, aiding in the design of safer and more efficient energy storage devices. In the field of helicopter dynamics, multiscale modeling enables engineers to simulate the interaction between aerodynamics, structural mechanics, and control systems. By integrating these disparate disciplines, engineers can optimize helicopter design for improved performance, maneuverability, and safety. Despite significant advancements, multiscale modeling of complex systems still faces challenges. Bridging the gap between different scales, accurately representing system dynamics, and incorporating uncertainty remain areas of active research. Furthermore, the increasing complexity of modern systems demands innovative computational techniques and interdisciplinary collaboration. In conclusion, the state of the art in multiscale modeling and simulation of complex systems encompasses a diverse range of applications, from bioliquids and batteries to helicopters. By integrating knowledge across multiple scales, researchers strive to unravel the mysteries of nature, optimize technological innovations, and address pressing societal challenges.

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Matevz Dular - University of Ljubljana

Cavitation, a formation of small vapor bubbles inside an initially homogeneous liquid medium, can occur on different complexity scales - the simplest one being a single cavitation bubble. Yet, even here a plethora of phenomena are present.

In the 60', the first recordings of the bubble collapse by a high-speed camera, revealed a formation of high-velocity jets (>100m/s) directed toward the nearby solid surface. These was associated with one of the most ubiquitous issues of cavitation – cavitation erosion, which causes failure of pumps, turbines, marine propellers and even rocket engine turbopumps.

In the talk we will discuss recent developments understanding the interaction of a single cavitation bubble with i) a rigid surface, ii) a compliant structure and iii) the bubble collapse in broken symmetry conditions. The results show a promise of controlling the bubble shape and the collapse direction, which may lead to developments in engineering, chemistry and medicine.
Created on May 16, 2025

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