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CCS Seminar
Friday
November 13, 2009
12:00 noon
Physics Research Building - Room 595
3 Cummington Street
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Frank Alexander – LANL Collaborator
Los Alamos National Laboratory - Los 
Alamos, NM

"Equation-free Implementation of 
Statistical Moment Closures"

I will present a general numerical 
scheme for the practical implementation 
of statistical moment closures suitable 
for modeling complex, large-scale, 
nonlinear systems. Building on recently 
developed equation-free methods, this 
approach numerically integrates the 
closure dynamics, the equations of which 
may not even be available in closed 
form. Although closure dynamics 
introduce statistical assumptions of 
unknown validity, they can have 
significant computational advantages as 
they typically have fewer degrees of 
freedom and may be much less stiff than 
the original detailed model. The 
numerical closure approach can in 
principle be applied to either 
deterministic or stochastic for which 
there may be no scale separation. I will 
demonstrate the equation-free approach 
on a nonlinear stochastic partial 
differential equation and describe 
further research directions.



Cheryl Endicott
Center for Computational Science
3 Cummington Street
Boston, MA 02215
tel: 617-358-1470
fax: 617-358-2487
http://ccs.bu.edu

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