14-08-2012, 03:47 PM
Completing the Journey of Moore’s Law
Completing the Journey.pdf (Size: 1.63 MB / Downloads: 38)
Simulation of Physics on a Computer
• Space is divided into cells,
each with computer
variables representing the
physical state of the
volume represented by
the cell
• The computer updates
the state of a cell for
successive time intervals
ΔT based on some
physical laws
• I. e. Sijk’ = f(Sijk, states of
nearby cells)
Earthquake Risk Mitigation
• In an Earthquake-prone
region
– Some areas the size of
city blocks shake a lot
– Others are stable
• This effect is due to
focusing or deflection of
seismic waves due to
underground rock
structure
• Mitigation
– Identify dangerous
areas and avoid
building there
– Identify dangerous
areas by simulating
many typical
Earthquakes and noting
the shaking
– Requires an image of
the underground rock
structure
Example Application: Earthquake Mitigation
• Forward simulation
– Match the results of a
seismic simulation with
observed data from
seismographs
• Imaging
– Deduce the structure of
rock under the region
(imaging) by repeatedly
simulating the error
from forward simulation
by adjoint methods
Global Climate
• Objective
– Collect data about Earth
– Model climate into the future
– Provide “decision support” and ability to “mitigate”
• Approaches
– Climate models exist, but need they more
resolution, better physics, and better initial
conditions (observations of the Earth)
• Computer Resources Required
– Increments over current workstation on next slide