Michael L. Calvisi

Education:

Research Interests:          

I am interested in the development of analytical and numerical methods for problems in bubble dynamics, cavitation, multi-phase flows and interfacial flows.  I have primarily used the Boundary Integral Method (BIM), which is efficient at modeling moving interfaces.  Using the BIM, I have investigated the physics of intense bubble collapses subject to acoustic and shock wave forcing, in the context of sonochemistry and Shock Wave Lithotripsy (a noninvasive biomedical procedure for breaking up kidney stones).  I am keenly interested in biomedical and bio-fluids problems, and in the application of dynamical systems theory to these and other problems in fluid mechanics.

Current Research Projects:

• Microbubble Contrast Agents: Development of a 3-dimensional BIM code capable of modeling microbubbles coated with viscoelastic shells near deformable interfaces (conference abstract: APS-DFD 2007 Abstract).


• Weakly Compressible Bubble Dynamics: Development of the theory and numerical methods for modeling nonspherical bubbles in weakly compressible fluids (conference abstract: BAMC 2008).


• Shock-Bubble Interaction:
•  Numerical modeling of the interaction of shock waves with bubbles, particularly in relation to Shock Wave Lithotripsy (SWL), a noninvasive biomedical procedure for disintegrating kidney stones (conference abstract: IUTAM 2007 Abstract).
• Experimental investigations into shock-bubble interaction near rigid surfaces (see below images):
  

Bubble collapsing near a rigid surface (above): A laser-generated bubble expands and collapses
near a rigid surface, which is positioned just above the frame.  The interframe time is 30 µs and the
maximum bubble size is ~100 µm.  (Images taken at the University of Göttingen, Drittes Physikalisches Institut.)




Bubble interacting with shock wave near a rigid surface (above): A lithotripter shock wave traveling
from top to bottom  interacts with a laser-generated bubble near the time of its maximum volume (between the
third and fourth frames).  A rigid surface is positioned just above the frame.  The interframe time is 5 µs and the
maximum bubble size is ~100 µm.  (Images taken at the University of Göttingen, Drittes Physikalisches Institut.)

M.L. Calvisi, Q.X. Wang and J.R. Blake.  2008.  Acoustic cavitation of three-dimensional bubbles with viscoelastic shells.

M.L. Calvisi and J.R. Blake.  2008.  Nonspherical acoustic bubbles in weakly compressible flows.

REFEREED JOURNAL ARTICLES:

M.L. Calvisi, J.I. Iloreta and A.J. Szeri.  2007.  Dynamics of bubbles near a rigid surface subjected to a lithotripter shock wave.  Part II.  Reflected shock intensifies nonspherical cavitation collapse.  Journal of Fluid Mechanics (accepted for publication). preprint (pdf)

E. Klaseboer, S.W. Fang, C.K. Turangan, B.C. Khoo, A.J. Szeri, M.L. Calvisi, G.N.Sankin and P. Zhong.  2007.  Interaction of lithotripter shockwaves with single inertial cavitation bubbles.  Journal of Fluid Mechanics 593, 33-56.  pdf

M.L. Calvisi, O. Lindau, J.R. Blake and A.J. Szeri.  2007.  Shape stability and violent collapse of microbubbles in acoustic traveling waves.  Physics of Fluids 19(4), 047101.  pdf

M.L. Calvisi.  2006.  Shape stability and violent collapse of microbubbles interacting with acoustic waves and shocks.  Ph.D. dissertation, University of California, Berkeley.  pdf

J. Awrejcewicz and M.L. Calvisi.  2002.  Mechanical models of Chua’s Circuit.  International Journal of Bifurcation and Chaos 12(4), 671-686.  pdf

Links:

Centre for Mathematical Modeling and Chemical Engineering (CMMCE):  http://www.cmmce.bham.ac.uk/cmmce.htm 

Applied Science & Technology Graduate Group, U.C. Berkeley (AS&T):  http://www.coe.berkeley.edu/AST/

Mechanical Engineering Department, U.C. Berkeley:  http://www.me.berkeley.edu/