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   COLLOQUIUM OF THE LABORATORY FOR COMPUTER DESIGN OF MATERIALS        
                   School of Computational Sciences     
                           (CSI 898-Sec 001) 
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     Enhancing Accuracy and Speed for Incompressible Flow Solvers

                           Rainald Lohner
School of Computational Sciences, George Mason University, Fairfax, VA

This talk will summarize recent improvements in speed and accuracy
for incompressible flow solvers. In particular, the development of
explicit multistage and fully implicit velocity predictors in the
context of projection schemes has led to speedups of 1:5-1:10. The
explicit multistage velocity predictors also offer the possibility
of achieving a very high order of accuracy for the velocities,
something hitherto impossible. For dispersion simulations, flowfields 
are precomputed and later re-used to simulate many release events. 
Deactivation of regions without contaminant leads to speedups of 
1:3-1:10 without affecting the results.

The combination of improved incompressible flow solvers and faster
dispersion solvers has opened new fields of exploration, e.g. the
optimal placement of sensors. Several examples will demostrate the 
validity and accuracy of the proposed schemes.

                         Monday , November 10, 2003
                                  4:30 pm
                        Room 206, Science & Tech. I

Refreshments will be served at 4:15 PM.
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Find the schedule at http://www.scs.gmu.edu/lcdm/seminar/schedule.html
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