[Announce] NHERI SimCenter 6/12 Webinar Announcement

[announce at designsafe-ci.org]

*NHERI SimCenter*–
* Natural Hazards Engineering 101 Monday, **June 12, 2017, 11am – 12pm PDT*


*Overview of Computational Fluid Dynamics, **Simulation & Computational
Tools in Wind Engineering*


*REGISTER* for this webinar at
https://www.designsafe-ci.org/learning-center/training/simce
nter/webinar-170612/

Connection information will be distributed upon receipt of registration.



*ABSTRACT:*

Fluid-structure interactions in wind engineering are complex and
multi-scale with nonlinear interactions among different scales, which
preclude a functional relationship between wind and its effects on built
environment. The presence of atmospheric turbulence with eddies of various
sizes contributes to additional complexity as summarized by Leonardo di ser
Piero da Vinci, “…the smallest eddies are almost numberless, and large
things are rotated only by large eddies and not by the small ones, and
small things are turned by small eddies and large.” In view of these
challenges, physical modeling in wind tunnels have traditionally served as
a most reliable source of quantifying wind load effects. In digital age
with burgeoning growth in computational resources and parallel advances in
computational fluid dynamics, computational methods are evolving with a
promise of becoming a most versatile, convenient and reliable means of
assessing wind loads effects. CFD based simulations provide information
non-intrusively on quantities of interest at any location in the domain,
whereas it is limited to only sensor locations in wind tunnels. In order to
realize this potential, assurance of robustness and accuracy of numerical
simulations is critical before the physical simulations in wind tunnels are
relegated to simply validation of final designs. To usher new advances in
the digital domain, the NSF’s NHERI SimCenter is designed to develop the
next-generation of computational modeling and simulation software tools and
web-enabled workflow management frameworks. These would be delivered to the
community of users through Discovery Workspace at the NHERI’s CI Center
DesignSafe.

In this context, the seminar will provide a rudimentary background of
wind-structure interactions. This will be followed by a guided tour of
computational fluid dynamics (CFD) with a focus on wind engineering
applications. The success in numerically capturing the complexity of
massively separated flows around structures compounded by multi-scale
fluctuations in the flow due to turbulence and their nonlinear interactions
will be discussed in light of the three main approaches central to CFD,
i.e., RANS, LES and DNS. An overview of the relative success of CFD in
aerospace engineering and the current state-of-the-art in wind engineering
will be presented by delineating the differences in the approach flow
conditions and the streamline nature of bodies versus bluff profiles. Also,
CFD applications that integrate other emerging computational and machine
learning tools will be presented in examples of shape optimization of
structural form, uncertainty quantification and multi-fidelity modeling
will be presented.

Briefly, the presentation will offer a quick overview of a virtual wind
tunnel under development at SimCenter along with a preview of stochastic
simulations and database enabled design will be presented.

*PRESENTER:*



*Dr. Ahsan Kareem *is the Robert M. Moran Professor of Engineering and the
Director of the NatHaz Modeling Laboratory at the University of Notre Dame.
His work focuses on characterization and formulation of dynamic load
effects due to wind, waves and earthquakes on tall buildings, long span
bridges, offshore structures and other structures via fundamental
experimental, laboratory and full-scale measurements utilizing cyber and
cyber-physical infrastructures.

He is elected President of the International Association for Wind
Engineering (IAWE). He has been awarded numerous honors, including the
Presidential Young Investigator Award from the White House Office of
Science and Technology. A recipient of ASCE’s: Theodore von Karman Medal,
Masanobu Shinozuka Medal, James Croes Medal, Robert H. Scanlan Medal and
Jack E. Cermak Medal and State-of-the-Art Award, inducted to the Offshore
Technology Conference Hall of Fame and Distinguished Member of ASCE; Alan
G. Davenport Medal of IAWE; Distinguished Research Award of IASSAR (Int’l
Assoc. for Structural. Safety and Reliability); the University of Notre
Dame. He has served as a High-End Foreign Expert at Tongji University and
delivered 2013 Scruton Lecturer at the Institute of Civil Engineers,
London, UK. He has been appointed Honorary Professor at several
universities overseas, serves on the Editorial Board of several
international journals and has recently co-authored two books. He is an
elected Member of the US National Academy of Engineering.





*About Natural Hazards Engineering 101:*



NHE 101 is a webinar series intended to provide a common knowledge base for
the NHERI community. Webinars will, for each of the primary natural hazards
in the NHERI program, provide an introduction to fundamental concepts and
an overview of experimental- and simulation-based research. Webinars will
also provide an introduction to numerical methods and computational tools
used in NHE research. All are encouraged to participate.
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