Jason M Ortega

Email: ortega17@llnl.gov
Phone: +19254233824


B.S., U.C. Berkeley, Mechanical Engineering, 1995
M.S., U.C. Berkeley, Mechanical Engineering, 1998
Ph.D., U.C. Berkeley, Mechanical Engineering, 2000


Expertise and Research Interests    

Experimental and computational fluid dynamics (CFD).  Extensive experience in particle image velocimetry (PIV), wind tunnel measurements (full- and model-scale vehicles), towing tank measurements, in vitro measurements of hemodynamic flows, CFD code validation, data analysis, and computational model development.  Research interests include vortex dynamics and instability, bio-fluid dynamics, heavy vehicle aerodynamics, porous media flows, high-speed compressible flows, and medical device research and design.



Bristol, R.L., Ortega, J.M., & Savas Ö.  1999 A towing tank study of airfoil wake vortices at Re of order 105, AIAA Paper 99-3419.

Ortega, J.M. & Savas, Ö. 2001  A rapidly growing instability mode in trailing multiple-vortex wakes, AIAA J., 39, 750-754.

Ortega, J.M., Bristol, R. L. & Savas, Ö.  2002 Wake alleviation properties of triangular-flapped wings, AIAA J., 40, 709-721.

Ortega, J.M., Dunn, T., McCallen, R.C., & Salari, K. 2002  A computational study of a truncated trailer geometry, The Aerodynamics of Heavy Vehicles:  Trucks, Buses, and Trains, United Engineering Foundation, Monterey-Pacific Grove, California.

Ortega, J.M., Bristol, R.L. & Savas, Ö. 2003  Experimental study of the instability of unequal strength counter-rotating vortex pairs, J. Fluid Mech., 474:35-84.

Bristol, R.L., Ortega, J.M. & Savas, Ö. 2003  Experimental study of co-rotating wake vortex merger at Re of O(105), AIAA J., 41:741-744.

Bristol, R.L., Ortega, J.M., Marcus, P.S., & Savas, Ö.  2004 On cooperative instabilities of parallel vortex pairs, J. Fluid Mech., 517:331-358.

Wheeler, E. K., Benett, W., Stratton, P., Richards, J., Chen, A., Christian, A., Ness, K.D., Ortega, J., Li, L.G., Weisgraber, T.H., Goodson, K., & Milanovich, F.  2004  Convectively driven polymerase chain reaction thermal cycler, Analytical Chemistry, 76(14):4011-4016.

Ortega, J.M. & Salari, K.  2004  An experimental study of drag reduction devices for a trailer underbody and base, AIAA Paper 2004-2252.

Salari, K., Ortega, J., & Castellucci, P.  2004  Computational prediction of aerodynamic forces for a simplified integrated tractor-trailer geometry, AIAA Paper 2004-2253.

Tsai, W., Savas, Ö., Maitland, D., Ortega, J., Small, W., Wilson, T., & Saloner, D.  2006 Experimental study of the vascular dynamics of a saccular basilar aneurysm, IMECE2006-14662, Proceedings of IMECE 2006 ASME International Mechanical Engineering Congress and Exposition November 5-10, Chicago, Illinois, USA.

Ortega, J.M., Small, W., Wilson, T.S., Benett, W.J., Loge, J.M., & Maitland, D.J. 2007 A shape memory polymer dialysis needle adapter for the reduction of hemodynamic stress within arteriovenous grafts, IEEE Trans. Biomed. Eng., 54(9):1722-4.

Maitland, D.J., Small, W., Ortega, J.M., Buckley, P.R., Rodriguez, J., Hartman, J., & Wilson, T.S. 2007 Prototype laser-activated shape memory polymer foam device for embolic treatment of aneurysms, Journal of Biomedical Optics, 12(3):1-3.

Ortega, J., Salari, K., & Storms, B.  2007  Investigation of tractor base bleeding for heavy vehicle aerodynamic drag reduction, The Aerodynamics of Heavy Vehicles:  Trucks, Buses, and Trains II, Tahoe City, California, August 26-31.

Ortega, J., Maitland, D., Wilson, T., Tsai, W., Sava??, Ö., & Saloner, D.  2007  Vascular dynamics of a shape memory polymer foam aneurysm treatment technique, Annals of Biomedical Engineering, 35(11):1870-1884.

Ortega, J., Hartman, J., Rodriguez, J., & Maitland, D.  2008  Post-treatment hemodynamics of a basilar aneurysm and bifurcation, Annals of Biomedical Engineering, 36(9):1531-1546.

Ortega, J.M. & Salari, K.  2008  Investigation of a trailer underbody fairing for heavy vehicle aerodynamic drag reduction, 08CV-0026, SAE Commercial Vehicle Engineering Congress and Exhibition, October 7-9, Rosemont, Illinois, USA.

Salari, K. & Ortega, J.  2010  Tractor-trailer truck aerodynamics, McGraw-Hill Yearbook of Science & Technology, 390–392.

Ortega, J. M.  2011  Non-lethal blast wave interactions with a human head, Computers & Fluids, 52:92–103

Ortega, J., Salari, K., Brown, A., & Schoon, R.  2011 Aerodynamic drag reduction of class 8 heavy vehicles: a full-scale wind tunnel test, LLNL Technical Report, LLNL-JRNL-558413.

Ortega, J.M., Hartman, J., Rodriguez, J.N., & Maitland, D.J.  2013  Virtual treatment of basilar aneurysms using shape memory polymer foam, Annals of Biomedical Engineering, 41(4):725–743.

Ortega, J.M. 2013 A Porous media model for blood flow within reticulated foam, Chemical Engineering Science, 99:59–66.

Muschenborn, A.D., Ortega, J.M., Szafron, J.M., & Maitland, D.J. 2013  Porous media properties of reticulated shape memory polymer foams and mock embolic coils for aneurysm treatment, BioMedical Engineering OnLine, 12:103.


Featured Articles

Rossier, R.N. 2002 A twist of fate:  putting a new spin on wake turbulence, Business and Commercial Aviation, September, 77-86.

Light, K. 2008  Shaping the future of aneurysm treatments, Science & Technology Review, Lawrence Livermore National Laboratory, May/June, 4-12.

Wampler, S., December 2010/January 2011, How $10 billion a year might be saved in fuel costs, Innovation, 28-30.

Meissner, C.  2014  Foams help heal a deadly affliction, Science & Technology Review, Lawrence Livermore National Laboratory, September, 16-19.


Professional Memberships

American Physical Society, Division of Fluid Dynamics, Member
American Institute of Aeronautics and Astronautics, Member


Honors and Awards        

Mechanical Engineering Department Citation Award, U.C. Berkeley, 1995    
National Science Foundation Graduate Fellowship Award, 1996    
American Institute of Aeronautics and Astronautics Fluid Dynamics Graduate Award, 1997    
Gold Award, Engineering Technologies Division, Lawrence Livermore National Laboratory, 2011