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DTSTART;TZID=America/New_York:20230605T100000
DTEND;TZID=America/New_York:20230605T110000
DTSTAMP:20260404T100614
CREATED:20230531T175140Z
LAST-MODIFIED:20230531T175140Z
UID:10007572-1685959200-1685962800@seasevents.nmsdev7.com
SUMMARY:MEAM Seminar: "Wall-modeled LES of 3-D Turbulent Boundary Layer with Emphasis on Grid Independency"
DESCRIPTION:The capability to predict high-Reynolds-number turbulent flows is essential for many natural and engineering flows such as external aerodynamics (wind turbines\, aircraft wings)\, hydrodynamics (the hull of marine vehicles) and atmospheric boundary-layer flow over complex landscapes and cityscapes. However\, due to extreme disparity of scales present in high-Reynolds-number wall-bounded turbulent flows\, any attempt to simulate these flows directly without resorting to modeling of some sort results in prohibitively large computational cost. Among various modeling paradigms\, wall-modeled large-eddy simulation (WMLES) has the potential to be both predictive and affordable\, capturing more of the complex flow physics in the outer portion of boundary layers while modeling the expensive inner layer. \nIn this talk\, I will first present a comparative study of WMLES of a turbulent boundary layer with mean-flow three-dimensionality developing on the floor of a bent square duct\, which mimics the flow over the swept wing of the aircraft. It is demonstrated that more complex wall models better predict the near-wall three-dimensionality. The wall-stress direction from the wall models is shown to have separable contributions from the equilibrium stress part and the integrated nonequilibrium effects\, where how the latter is modeled differs among the wall models. Second\, I will discuss the ill-defined notion of grid convergence in WMLES. I propose that the convergence rate of WMLES is controlled by the extent of the wall-modeled region. A new perspective here is that one may attempt to converge WMLES at the desired grid resolution\, while the accuracy of the converged solution can be attributed primarily to wall models. Lastly\, I will talk about a new perspective on the dynamic LES models for subgrid-scale closure. I will show that there are dynamically important directions along which dynamic models can be further optimized.
URL:https://seasevents.nmsdev7.com/event/meam-seminar-wall-modeled-les-of-3-d-turbulent-boundary-layer-with-emphasis-on-grid-independency/
LOCATION:Room 2C4\, David Rittenhouse Laboratory Building\, 209 S. 33rd Street\, Philadelphia\, PA\, 19143\, United States
CATEGORIES:Doctoral,Dissertation or Thesis Defense
ORGANIZER;CN="Mechanical Engineering and Applied Mechanics":MAILTO:meam@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20230606T100000
DTEND;TZID=America/New_York:20230606T113000
DTSTAMP:20260404T100614
CREATED:20230524T171524Z
LAST-MODIFIED:20230524T171524Z
UID:10007568-1686045600-1686051000@seasevents.nmsdev7.com
SUMMARY:MEAM Seminar: “Computational Study on the Influence of Roughness at Low and Very-High Reynolds Numbers”
DESCRIPTION:Many fluid problems of interest\, such as turbulent flow over an airplane or transport processes in geophysical flows\, contain wall-bounded regions that form boundary layers. Oftentimes\, both numerical and experimental studies are simplified by using smooth surfaces. This simplification has allowed us to gain a greater understanding of near-wall processes for flows of engineering interest\, yet most surfaces are inherently rough. In many cases\, especially at higher Reynolds numbers\, the roughness protrudes far enough into the boundary layer to disrupt the flow. This roughness can induce form drag\, reducing efficiency for ships\, planes\, and turbines\, or alter transport of particles in atmospheric flows. For lower Reynolds number flows\, roughness may produce the opposite effect\, reducing drag or enhancing lift capabilities. This is with the addition of dimples on a golf ball or the alula on a bird wing. \nIn this talk\, I present numerical results on the effects of roughness at two opposite ends of the spectrum. At low Reynolds number (O(103))\, roughness elements displayed an ability to decrease drag\, reducing power required\, and augment lift capabilities for a propeller designed for use with a micro-unmanned aerial vehicle. I discuss the physical mechanisms at play which influence near-wall vortical structures\, enhancing the aerodynamics of the propeller in a particularly viscous regime. The results of the simulations are corroborated with an in-house experimental study. Next\, I present preliminary simulation results to a very-high Reynolds number flow (O(106)) over a real topography featuring a step-change in roughness. An atmospheric boundary layer flow over the dunes at White Sands National Park in New Mexico is studied to discern the mechanism behind reduced sediment transport downstream of the step-change. I then discuss current efforts to explore how the internal boundary layer formed by the new wall condition may influence small near-wall scale interaction with large-scales in the outer portion of the flow.
URL:https://seasevents.nmsdev7.com/event/meam-seminar-computational-study-on-the-influence-of-roughness-at-low-and-very-high-reynolds-numbers/
LOCATION:Room 337\, Towne Building\, 220 South 33rd Street\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Seminar
ORGANIZER;CN="Mechanical Engineering and Applied Mechanics":MAILTO:meam@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20230606T140000
DTEND;TZID=America/New_York:20230606T153000
DTSTAMP:20260404T100614
CREATED:20230601T190610Z
LAST-MODIFIED:20230601T190610Z
UID:10007574-1686060000-1686065400@seasevents.nmsdev7.com
SUMMARY:MSE PhD Thesis Defense: Self-Healing and Shape Memory Metal Electrodes in Magnesium-and Lithium-Ion Batteries
DESCRIPTION:
URL:https://seasevents.nmsdev7.com/event/mse-phd-thesis-defense-self-healing-and-shape-memory-metal-electrodes-in-magnesium-and-lithium-ion-batteries/
LOCATION:Glandt Forum\, Singh Center for Nanotechnology\, 3205 Walnut Street\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Dissertation or Thesis Defense
ORGANIZER;CN="Materials Science and Engineering":MAILTO:johnruss@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20230609T103000
DTEND;TZID=America/New_York:20230609T114500
DTSTAMP:20260404T100614
CREATED:20230125T152758Z
LAST-MODIFIED:20230125T152758Z
UID:10007446-1686306600-1686311100@seasevents.nmsdev7.com
SUMMARY:Spring 2023 GRASP on Robotics: Pauline Pounds\, The University of Queensland\, "Drones\, Bipeds and Sensors - 10 Years of the UQ Robotics Design Lab"
DESCRIPTION:This is a hybrid event with in-person attendance in Wu and Chen and virtual attendance via Zoom. This week’s presenter will be in-person as well.  \n  \nABSTRACT\nThe Robotics Design Lab was founded in 2012 at the University of Queensland\, Australia\, and considers the holistic design of robots as a system.  With the RDL Pauline Pounds’ work has focussed on improving robot performance\, reducing cost\, and developing practical solutions.  Her work has sought to increase drone endurance\, payload and range\, as well as develop ultra-low cost self-deploying sensor systems.  She has developed new sensors to allow drones to better sense and respond to aerodynamic conditions around them.  Her latest work on bipeds seeks to enable affordable dynamical bipeds for commercial applications.  This talk will give a broad overview of the last decade of her work in the RDL and highlight specific results within each of these areas.
URL:https://seasevents.nmsdev7.com/event/spring-2023-grasp-on-robotics-pauline-pounds/
LOCATION:Wu and Chen Auditorium (Room 101)\, Levine Hall\, 3330 Walnut Street\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Seminar
ORGANIZER;CN="General Robotics%2C Automation%2C Sensing and Perception (GRASP) Lab":MAILTO:grasplab@seas.upenn.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20230609T130000
DTEND;TZID=America/New_York:20230609T140000
DTSTAMP:20260404T100614
CREATED:20230601T184257Z
LAST-MODIFIED:20230601T184257Z
UID:10007575-1686315600-1686319200@seasevents.nmsdev7.com
SUMMARY:MEAM Ph.D. Thesis Defense: "Manually-Operated\, Slider Cassette for Multiplexed Molecular Detection at the Point of Care"
DESCRIPTION:Personalized medicine requires the identification of disease-causing agents prior to prescribing therapy. Currently\, molecular detection requires shipping bio samples to centralized laboratories. The time delay between sample collection and test results prevents health care givers from making timely\, informed decisions. Furthermore\, there is a shortage in centralized laboratories and trained technicians in resource poor settings such as rural areas and developing countries. To address this need for cost-effective\, reliable\, user-friendly\, real-time\, multiplexed detection of co-endemic pathogens at the point of need by minimally trained personnel\, I propose a 3D-printed\, manually operated\, slider cassette for multiplexed molecular detection. All needed reagents (in dry form) and buffers are pre-stored in the cassette\, refrigeration-free. Once the user introduces a raw sample such as whole blood into the cassette\, the user pushes a sliding bar that contains a nucleic acid isolation membrane\, comprised of chitosan coated glass fiber\, through a sequence of unit operations. The slider’s motion actuates blisters that discharge\, in sequence\, lysis buffer\, wash solution\, and elution solution. The lysis process is assisted with heat incubation\, wherein heat is provided by an exothermic reaction. Nucleic acids are isolated from the lysate through binding to the chitosan-coated membrane under low pH conditions. At the end of the sliding process\, the nucleic acids are eluted with a high pH buffer and aliquoted by capillary forces to individual reaction chambers. Each chamber stores a pre-dried LAMP reaction mix specific to a target. The chambers are then incubated at 65C\, facilitating LAMP amplification. The reaction products are detectable either in real time with fluorescent dye and/or at the end point with color change (colorimetric dye). A two-dimensional finite element (COMSOL) simulation was carried out to test for potential crosstalk among the reaction chambers and a three-dimensional finite element (FLUENT) simulation was performed to evaluate the on-cassette chemical heater’s performance used in the lysis process. I demonstrate the entire molecular diagnostic process from sample (plasma and blood) to answer by testing contrived samples spiked with various concentrations of HIV\, HCV\, and HBV.
URL:https://seasevents.nmsdev7.com/event/meam-ph-d-thesis-defense-manually-operated-slider-cassette-for-multiplexed-molecular-detection-at-the-point-of-care/
LOCATION:Zoom – Email MEAM for Link\, peterlit@seas.upenn.edu
CATEGORIES:Doctoral,Dissertation or Thesis Defense
ORGANIZER;CN="Mechanical Engineering and Applied Mechanics":MAILTO:meam@seas.upenn.edu
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