[grads] [Sem-coll] Applied Math Seminar Update

Joe Millham jmillhamiit at gmail.com
Fri Jan 30 16:31:07 CST 2009


Hello everyone,
There has been a change in time and an addition for the department
seminars for next week, Feb. 2-6.  Please join those meetings that you
would find interesting.

Stochastic & Multiscale Modeling Seminar
Wednesday, February 4
E1 106 4:40 pm
Guowei He
Institute of Mechanics, Chinese Academy of Sciences
"A Hybrid Simulation of Continuum and Molecular Dynamics for Super-Hydrophobics"
See abstract below
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Computation & Applications Seminar
Friday, February 6  ***Please note change in date***
E1 129 12:40 pm
Amlan Barua
Illinois Institute of Technology AM PhD Candidate
"Perbutation Analysis of a Crystal Growth Problem"
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Stochastic & Multiscale Modeling Seminar
Wednesday, February 4
Guowei He
Institute of Mechanics, Chinese Academy of Sciences
"A Hybrid Simulation of Continuum and Molecular Dynamics for Super-Hydrophobics"
Abstract:
Micro- and nano-fluidics involve a broad range of scales from the
atomic scales to the continuum ones. A full molecular dynamics
simulation is able to simulate the fluid flows at the micro- and
nano-scales. However, it is computationally prohibitive due to the
limitation of computer memory and computation time. On the other hand,
a full continuum description, such as the Navier-Stokes equation, is
computationally available but unable to describe the fluid flows in
the region where the continuum assumption breaks down. A kind of those
problems is the superhydrophobics: the patterned roughness on a
hydrophobic solid surface enhances its hydrophobics and yields a large
slip velocity at the solid surfaces. The superhydrophobics property is
particularly attractive, since it may provide an efficient method for
mass transport and drag reduction in micro- and nao-fluidics. An
appropriate approach to simulate the superhydrophobics is to use the
molecular dynamics in one region where the continuum assumption breaks
down and use the Navier-Stokes equations in another region where the
continuum assumption holds true, and those two descriptions are
coupled in the overlap region. The computation time in the hybrid
method is expected to be much less than that in the full molecular
dynamics simulation. The challenge is how to couple the Navier-Stokes
equations with the molecular dynamics simulation. In this talk, I will
introduce our recent work on the dynamic coupling model for the hybrid
computation and use the hybrid simulation to study superhydrophobics.
The numerical issue associated with the hybrid method will be
discussed.


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Thank you,


Joe Millham
Administrative Assistant
Department of Applied Mathematics
Illinois Institute of Technology
Engineering-1 Room 208
10 W. 32rd St.
Chicago IL 60616
312.567.8984 (Phone)
312.567.3135 (Fax)
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