Research

Hemodynamics of diseased vessels

The details of blood flow patterns and fluid mechanical forces in vessels affected by atherosclerosis and aneurysm have implications for the diagnosis and treatment of these diseases.  Clinical imaging modalities provide insufficient and sometimes misleading information about the risks of atheroslcerotic plaque rupture or aneurysm rupture.  Using computational fluid dynamics (CFD) and experimental methods including particle image velocimetry (PIV), we model these flows in order to better understand them.

Blood flow in diseased vessels is complicated by blood’s non-Newtonian behavior at low shear rates; by the tortuous, curved and branching human vasculature; by the tendency of severe atherosclerosis to trigger instability and transitional flow; and by the nonlinear behavior of vascular walls and the interaction between solid and fluid mechanics. We also consider the impact of these complications on our models.

Representative publications include the following:

  • Albert* Balaban Neufeld & Rossmann J. Biomechanics, 2014 Link
  • Cummins* & Rossmann ASME J. Biomechanical Engg, 2010 Link
  • Rossmann J. Mech Behavior Bio Materials, 2010     Link
  • Fisher* & Rossmann ASME J. Biomechanical Engg, 2009     Link
  • Utter* & Rossmann J. Biomechanics, 2007               Link
  • Stroud, Saloner & Berger J. Biomechanical Engg, 2002      Link

Aerodynamics of sports balls

What makes a curveball curve, a cricket ball googly, or a Wiffle ball zig when you thought it would zag?  Experiments on sports balls illuminate phenomena such as the transition to turbulence, the Magnus effect, and trapped vortices.

Representative publications include

  • Chan* & Rossmann, Sports Engineering, 2012 Link
  • Rossmann & Rau*, Am Journal Physics, 2007   Link

My Wiffle ball work is also featured in the March 2011 issue of Wired magazine, and in April 2014 in Popular Science.

SOTL, pedagogical, and higher ed scholarship

I’m also committed to progressive engineering education, and to engineering as a facet of prismatic liberal education. Some representative publications in the scholarship of teaching & learning and other higher ed topics:

  • Rossmann & Stewart-Gambino, NAS Commissioned Research, 2015 Link
  • Cohen, Rossmann, & Sanford Bernhardt, 2014 Link

Undergraduate involvement

Offering undergraduates the chance to make meaningful contributions to my research in fluid dynamics is one of my principal goals.  Those asterisks (*) up there represent Lafayette College undergraduates.  If you’re interested in doing research in biological fluid dynamics, biomechanics, or aerodynamics, send me an email!