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X-WR-CALNAME:Mechanical and Aerospace Engineering
X-ORIGINAL-URL:https://www.mae.ncsu.edu
X-WR-CALDESC:Events for Mechanical and Aerospace Engineering
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TZOFFSETFROM:-0500
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DTSTART:20160313T070000
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DTSTART:20161106T060000
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DTSTART;TZID=America/New_York:20160415T113000
DTEND;TZID=America/New_York:20160415T123000
DTSTAMP:20201025T215607
CREATED:20160405T203220Z
LAST-MODIFIED:20160406T183847Z
UID:471-1460719800-1460723400@www.mae.ncsu.edu
SUMMARY:Designing High-Order Methods for Solution Gradients: A Radical but Effective Approach
DESCRIPTION:Speaker: \nDr. Alireza Mazaheri — NASA Langley Research center \n \nAbstract: \nIn this talk\, we discuss high-order methods that are constructed with a reformulation of the target governing equations. The proposed methodology allows us to design high-order schemes that are capable in producing accurate and noise-free solution gradients on highly irregular elements. The reformulation strategy makes the governing equation hyperbolic in pseudo-time but does not change the physics of the phenomenon that is described by the target equation. We first present the reformulation strategy for a general time-dependent advection-diffusion problems (e.g.\, Navier-Stokes or Viscous Burger Equation)\, and introduce a different reformulation strategy fordispersive Partial Differential Equations (PDEs)\, such as those appear in hydrodynamics\, coastal engineering\, Soliton wave analysis\, nonlinear optics\, etc. Then\, we walk through development of high-order schemes on the platform of these reformulated governing equations\, and show that the resulting proposed high-order schemes lead to a same order of accurate solution and solution gradients (and Hessian or second-derivatives for the dispersive PDEs) on highly irregular unstructured grids. Furthermore\, the predicted solution gradients are accurate and noise-free. We finish the discussion with some suggestions for further advancements. \nBio: \nDr. Alireza Mazaheri is a Computational Aerothermodynamicist at NASA Langley Research center since 2006. Priorto his current position\, he worked at Parsons Inc. (as a research engineer)\, was a postdoctoral fellow at Pittsburgh University (from 2004-2005) and a National Research Council (NRC) postdoctoral fellow at the US Department of Energy (from 2003-2004). He earned PhD from Clarkson University in Mechanical Engineering\, MS from Shiraz University in Computational Thermo-Fluid Engineering\, and BS from Guilan University in Fluid Mechanics. Alireza has been involved in several NASA programs/projects\, including the Space Shuttle\, Orion Multi-Purpose Crew Vehicle (MPCV)\, Dream Chaser\, Hypersonic Inflatable Aerodynamic Decelerator (HIAD)\, High Energy Atmospheric Reentry Test (HEART)\, etc. His current research interests are on development of high-order methods that are capable in producing accurate and noise-free solution gradients(e.g.\, velocity gradients\, heat flux\, shear stresses\, etc.) on irregular tetrahedral elements.
URL:https://www.mae.ncsu.edu/event/designing-high-order-methods-solution-gradients-radical-effective-approach/
LOCATION:MAE EBIII Rm 2124
CATEGORIES:Appear on Homepage,Seminars
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