Karen E. Daniels
Most physical systems are not in equilibrium, but rather are subject to driving and/or dissipation. Far from equilibrium, where nonlinear effects become important, these systems display a rich array of complex behaviors. Systems can be dynamic, chaotic, or turbulent, and more remarkably can produce static patterns or exhibit persistent dynamics while remaining statistically stationary. Although there is typically no free-energy-like functional to minimize in a nonequilibrium system, quantities analogous to those used in equilibrium statistical mechanics can often elucidate the mean behavior.
Areas of Interest
Recent experiments address:
-- pattern formation and spatiotemporal chaos in fluid convection
-- the statistical mechanics of granular materials
-- morphological instabilities in complex fluids
-- laboratory models of geophysical processes (earthquakes and meteor impacts)
James G. Puckett and Karen E. Daniels.
Equilibrating temperaturelike variables in jammed granular subsystems
Physical Review Letters 110: 058001 (2013)
Eli T. Owens and Karen E. Daniels.
Acoustic measurement of a granular density of modes
Soft Matter 9:1214 (2013)
Carlos P. Ortiz, Robert Riehn, and Karen E. Daniels.
Flow-Driven Formation of Solid-like Microsphere Heaps.
Soft Matter, 9 (2), 543 - 549, 2013
Kiri Nichol and Karen E. Daniels.
Equipartition of rotational and translational energy in a dense granular gas. Physical Review Letters 108, 018001 (2012)
Nicholas W. Hayman, Lucie Ducloue, Kate L. Foco, Karen E. Daniels.
Granular controls on periodicity of stick-slip events: kinematics and
force-chains in an experimental fault.
Pure and Applied Geophysics 168: 2239-2257 (2011)
Melissa L. Fender, Frederic Lechenault, Karen E. Daniels.
Universal shapes formed by two interacting cracks.
Physical Review Letters 105: 125505 (2010).
David W. Fallest, Adele M. Lichtenberger, Christopher J. Fox, and Karen E. Daniels.
Fluorescent visualization of a spreading surfactant.
New Journal of Physics 12: 073029 (2010).
Sally E. Thompson and Karen E. Daniels.
A Porous Convection Model for Small-Scale Grass Patterns.
The American Naturalist. 175: E10-E15 (2010)