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March 2021

MEAM Seminar: “Understanding and Controlling Pattern Formation of Soft Materials”

March 9 at 10:30 AM - 12:00 PM
Zoom – Email MEAM for Link, peterlit@seas.upenn.edu

Soft elastic solids, such as elastomers and hydrogels, are used in many practical applications ranging from adhesives to biocompatible scaffolds for tissue engineering. Biological cells and tissues have very similar mechanical properties as those of soft materials. Such solids undergo large deformations and can respond to forces such as interfacial tension, gravity, and residual stresses due to growth by swelling. Understanding how soft solids destabilize to external fields are crucial to avoid failure and aid engineering of materials of targeted…

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MEAM Seminar: “Control of Turbulent Wall Shear Flows and the Potential for ‘Designer Turbulence'”

March 16 at 10:30 AM - 12:00 PM
Zoom – Email MEAM for Link, peterlit@seas.upenn.edu

The financial and environmental cost of turbulence is staggering: manage to quell turbulence in the thin boundary layers on the surface of a commercial airliner and you could almost halve the total aerodynamic drag, dramatically cutting fuel burn, emissions and cost of operation. Yet systems-level tools to model scale interactions or control turbulence remain relatively under-developed. Resolvent analysis for turbulent flow provides a simple, but rigorous, approach by which to deconstruct the full turbulence field into a linear combination of…

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MEAM Seminar: “Exploring the Structure of Sediment-Laden Turbidity Currents”

March 23 at 10:30 AM - 12:00 PM
Zoom – Email MEAM for Link, peterlit@seas.upenn.edu

Turbidity currents are sediment-laden turbulent shear flows that run over a sloping bed, submerged beneath a deep layer of quiescent ambient fluid, driven by the excess hydrostatic pressure. As the current travels downslope, the flow interacts with the ambient fluid layer above through entrainment at the interface. In this process, the ambient fluid is continuously incorporated into the current and the thickness of the current increases. Simultaneously, the current also interacts with the bottom bed both depositing and resuspending sediment.…

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April 2021

MEAM Seminar: “Structure Preserving Reduced Order Models”

April 6 at 10:30 AM - 12:00 PM
Zoom – Email MEAM for Link, peterlit@seas.upenn.edu

The development of reduced order models for complex applications promises rapid and accurate evaluation of the output of complex models under parameterized variation with applications to problems which require many evaluations, such as in optimization, control, uncertainty quantification and applications where near real-time response is needed. However, many challenges remain to secure the flexibility, robustness, and efficiency needed for general large scale applications, in particular for nonlinear and/or time-dependent problems. After a brief introduction to reduced order models, we discuss…

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