Javier Urzay, Ph.D.

2010; Ph.D. Aerospace Engineer,
University of California San Diego (UCSD), California, USA.

2006; M.Sc. Aerospace Engineer,
University of California San Diego (UCSD), California, USA.

2005; B.Sc. and M.Sc. Mechanical Engineer,
Carlos III University of Madrid, Spain.

Research Interests


Multi-physics fluid mechanics:
- chemically-reacting flows, combustion and plasmas; multi-phase flows, fuel sprays and particle-laden flows; hypersonic propulsion; supersonic flows; turbulence physics; engineering applications to aeronautics, astronautics, jet propulsion & power, energy conversion, and national security.


Curriculum Vitae

(PDF)

Professional Experience (Research)


2016-Present; Senior Research Engineer (Stanford Academic Staff-Research),
2012-2016; Engineering Research Associate,
2011-2012; Postdoctoral Researcher,
Center for Turbulence Research, Stanford University.
Research topics:
- Energy transfer and multi-scale interactions in turbulent flames (Funded by AFOSR),
- Subgrid-scale modeling for particle-laden turbulent flows (DoE/NNSA),
- Shock-induced transition in hypersonic boundary layers (AFOSR),
- Plasmadynamics and aero-optics of adaptive plasma-assisted lenses (DARPA/SPAWAR),
- Shock-induced ignition in high-speed mixing layers (AFOSR),
- Transcritical high-pressure multi-phase flow modeling (AFOSR),
- Supersonic combustion (DoE/NNSA),
- Spray ignition and combustion.

2010-2011; Postdoctoral Researcher,
Combustion and Computational Fluid Dynamics Division, European Center for Research and Advanced Training in Scientific Computations (CERFACS), Toulouse (France).
- Thermoacoustics in jet engines (EC).

2005-2010; Research Engineer,
Center for Energy Research, Department of Mechanical and Aerospace Engineering, University of California San Diego (UCSD).
- Edge-flame propagation in swirling flows (NASA Microgravity).
- Elastohydrodynamic adhesion and lift-off of particles near walls (HFSP),

2004-2005; Undergraduate Researcher,
Department of Thermal Engineering and Fluid Mechanics, Carlos III University of Madrid (Spain).
- Hydrogen jets and supersonic aerodynamics.


Professional Experience (University Teaching)


2014-Present; Premajor Undergraduate Advisor,
Office of the Vice Provost for Undergraduate Education,
Stanford University.

2012-Present; Lecturer (=responsible for instruction of the full course),
Mechanical Engineering Department,
Stanford University.
Courses:
- ME 355 Compressible Flows (Class website and notes (PDF));


- ME 471 Turbulent Combustion (Class website and notes (PDF));

2009; Lecturer,
Department of Mechanical and Aerospace Engineering,
University of California San Diego (UCSD).
Course:
- MAE 180 Spacecraft Guidance, Navigation
and Mission Analysis.
(Class website and notes (PDF))

2007-2009; Teaching Assistant and substitute Lecturer (x 10 quarters),
Department of Mechanical and Aerospace Engineering,
University of California San Diego (UCSD).
Courses: MAE 101C Heat Transfer (x 5), MAE 101B Advanced Fluid Mechanics (x 2), MAE 101A Introductory Fluid Mechanics (x 2), MAE 105 Introduction to Mathematical Physics (x 1).



Peer-Reviewed Journal Publications (*=corresponding author)


Yang X.I.A.*, Urzay J. and Moin P.,
"Aerodynamic heating in wall-modeled LES of high-speed turbulent flows."
Submitted to AIAA Journal (2017).


Urzay J., Doostmohammadi A.* and Yeomans J.M.,
"Multi-scale statistics of turbulence motorized by active matter."
Journal of Fluid Mechanics, Accepted (2017).


Bassenne M.*, Urzay J., Schneider K. and Moin P.,
"Extraction of coherent clusters and grid adaptation in particle-laden turbulence using wavelet filters."
Physical Review Fluids 2, 054301 (2017). (PDF)

Park G.I., Bassenne M., Urzay J.* and Moin P.,
"A simple dynamic subgrid-scale model for LES of particle-laden turbulence."
Physical Review Fluids 2, 044301 (2017). (PDF)


O'Brien J., Towery C.A.Z., Hamlington P.E., Ihme M., Poludnenko A.Y. and Urzay J.*,
"The cross-scale physical-space transfer of kinetic energy in turbulent premixed flames."
(''Distinguished Paper - Turbulent Flames" at the 36th International Symposium on Combustion, Seoul, Korea).
Proceedings of the Combustion Institute 36, 1967-1975 (2017). (PDF)


Towery C.A.Z., Poludnenko A.Y., Urzay J., O'Brien J., Ihme M. and Hamlington P.E.*,
"Spectral kinetic-energy transfer in turbulent premixed reacting flows."
Physical Review E 93, 053115 (2016). (PDF)


Bassenne M., Urzay J.*, Park G.I. and Moin P.,
"Constant-energetics physical-space forcing methods for improved convergence to homogeneous-isotropic turbulence with application to particle-laden flows."
Physics of Fluids 28, 035114 (2016). (PDF)


Huete C.*, Urzay J., Sánchez A.L. and Williams F.A.,
"Weak-shock interactions with transonic laminar mixing layers of fuels for high-speed propulsion."
AIAA Journal 54, 966-979. (2016). (PDF)


Mortazavi M., Urzay J.* and Mani A.,
"Computational hydrodynamics and optical performance of inductively-coupled plasma adaptive lenses."
Physics of Plasmas 22, 062122, 1-20 (2015). (PDF)


Huete C., Sánchez A.L.*, Williams F.A. and Urzay J.,
"Diffusion-flame ignition by shock-wave impingement on supersonic mixing layers."
Journal of Fluid Mechanics 784, 74-108 (2015). (PDF)


Sánchez A.L.*, Urzay J. and Liñán A.,
"The role of separation of scales in the description of spray combustion"
(Invited Review Lecture at 35th International Symposium on Combustion, San Francisco CA).
Proceedings of The Combustion Institute 35, 1549-1577 (2015). (PDF)


Liñán A., Martinez-Ruiz D., Sánchez A.L.* and Urzay J.,
"Regimes of vaporization and combustion of sprays in counterflow mixing layers."
Combustion Science and Technology 187, 103-131 (2015). (PDF)


O'Brien J., Urzay J.*, Ihme M., Moin P. and Saghafian A.,
"Subgrid-scale backscatter in reacting and inert supersonic hydrogen-air turbulent mixing layers."
Journal of Fluid Mechanics 743, 554-584 (2014). (PDF)


Urzay J.*, Kseib N., Davidson D.F., Iaccarino G. and Hanson R.K.,
"Uncertainty-quantification analysis of the effects of residual impurities on hydrogen-oxygen ignition in shock tubes."
Combustion and Flame 161, 1-15 (2014). (PDF)


Timerman D.*, Greene D.F., Urzay J. and Ackerman J.D.,
"Turbulence-driven resonant vibrations cause pollen release in wind pollinated Plantago Lanceolata L."
Journal of the Royal Society Interface 11, 20140866 (2014). (PDF)


Martinez-Ruiz D., Urzay J.*, Sánchez A.L., Liñán A. and Williams F.A.,
"Dynamics of thermal ignition of spray flames in mixing layers."
Journal of Fluid Mechanics 734, 387-423 (2013). (PDF)


Urzay J.*, Nayagam V. and Williams F.A.,
"Theory of the propagation dynamics of spiral edges of diffusion flames in von Kármán swirling flows."
Combustion and Flame 158, 255-272 (2011). (PDF)


Urzay J.*,
"Asymptotic theory of the elastohydrodynamic adhesion and gliding motion of a solid particle over soft and sticky substrates at low Reynolds numbers."
Journal of Fluid Mechanics 653, 391-429 (2010). (PDF)



Urzay J.*, Llewellyn Smith S., Thompson E., and Glover B.J.,
''Wind gusts and plant aeroelasticity effects on the aerodynamics of pollen shedding: A hypothetical turbulence-initiatied wind-pollination mechanism."
Journal of Theoretical Biology 259, 785-792 (2009). (PDF)


Urzay J.*, Nayagam V. and Williams F.A.,
"Diffusion-flame extinction on a rotating porous-disk burner."
Proceedings of the Combustion Institute 32, 1219-1226 (2008). (PDF)


Urzay J.*, Llewellyn Smith S. and Glover B.J.,
"The elastohydrodynamic force on a sphere near a soft wall."
Physics of Fluids 17, 103106, 1-7 (2007). (PDF)



Technical Reports (contains unpublished material)



Jofre L. and Urzay J.
"On interfacial transport in transcritical flows of liquid fuels into high-pressure combustors."
Annual Research Briefs, Center for Turbulence Research, Stanford University (2016),
pp. 191-207. (PDF)

Bassenne M., and Urzay J.
"A dynamic approximate deconvolution model for unfiltered scalars in LES."
Annual Research Briefs, Center for Turbulence Research, Stanford University (2016),
pp. 103-105. (PDF)

Kim J., Bermejo-Moreno I., Schreyer A.-M. and Urzay J.
"LES of hypersonic compression-corner flows with upstream sub-boundary-layer microramp vortex generators."
Annual Research Briefs, Center for Turbulence Research, Stanford University (2016),
pp. 49-61. (PDF)

Schreyer A.-M., Bermejo-Moreno I., Kim J. and Urzay J.
"Separation control in hypersonic flow ramp interactions."
Proceedings of the Summer Program, Center for Turbulence Research, Stanford University (2016), pp. 223-232. (PDF)

Chan W. H. R., Urzay J., Mani A. and Moin P.,
"On the development of a subgrid-scale model for the generation of micro-bubbles from impacting liquid surfaces."
Annual Research Briefs, Center for Turbulence Research, Stanford University (2016),
pp. 147-159. (PDF)

Rahman M., Cheng W., Santamney R. and Urzay J.,
"Large-eddy simulation of sandstorms as charged particles suspensions in turbulent boundary layers."
Proceedings of the Summer Program, Center for Turbulence Research, Stanford University (2016), pp. 45-52. (PDF)

Jofre L., Urzay J., Mani A. and Moin P.,
"On diffuse-interface modeling of high-pressure transcritical fuel sprays."
Annual Research Briefs, Center for Turbulence Research, Stanford University (2015),
pp. 55-64. (PDF)

Urzay J., Bassenne M., Park G.I. and Moin P.,
"Characteristic regimes of subgrid-scale coupling in LES of particle-laden turbulent flows."
Annual Research Briefs, Center for Turbulence Research, Stanford University (2014),
pp. 3-13. (PDF)

Bassenne M., Urzay J. and Moin P.,
"Spatially-localized wavelet-based spectral analysis of preferential concentration in particle-laden turbulence."
Annual Research Briefs, Center for Turbulence Research, Stanford University (2015),
pp. 3-16. (PDF)

Ghodke C., Apte S. and Urzay J.,
"Direct numerical simulations of oscillatory wall-bounded flow over a closely-packed fixed bed of spherical particles."
Proceedings of the Summer Program, Center for Turbulence Research, Stanford University (2014), pp. 47-55. (PDF)

O'Brien J., Urzay J., Poludnenko A.Y., Hamlington P.E. and Ihme M.,
''Counter-gradient subgrid-scale transport and reverse-cascade phenomena in turbulent deflagrations.''
Proceedings of the Summer Program, Center for Turbulence Research, Stanford University (2014), pp. 147-157. (PDF)

Urzay J., Martinez-Ruiz D.M., Sánchez A.L., Liñán A. and Williams F.A.,
''Flamelet structures in spray ignition."
Annual Research Briefs, Center for Turbulence Research, Stanford University (2013),
pp. 107-122. (PDF)

Urzay J., Kseib N., Palacios F., Larsson J. and Iaccarino G.,
"A stochastic flamelet progress-variable approach for numerical simulations of high-speed turbulent combustion under chemical-kinetic uncertainties."
Annual Research Briefs, Center for Turbulence Research, Stanford University (2012),
pp. 17-30. (PDF)

Urzay J., Kseib N., Costantine P.G., Davidson D.F. and Iaccarino G.,
"Uncertainty-quantifying models for chemical-kinetic rates."
Annual Research Briefs, Center for Turbulence Research, Stanford University (2012).
pp. 3-16. (PDF)

Urzay J., Pitsch H. and Liñán A.,
''Source terms for calculations of vaporizing and burning fuel sprays with non-unity Lewis numbers in gases with temperature-dependent thermal conductivities."
Annual Research Briefs, Center for Turbulence Research, Stanford University (2011),
pp. 199-212. (PDF)

Urzay J.,
''A revised spray-combustion diagram of diffusion-controlled burning regimes in fuel-spray clouds."
Annual Research Briefs, Center for Turbulence Research, Stanford University (2011),
pp. 193-198. (PDF)

Kseib N., Urzay J. and Iaccarino G.,
"Statistical inference of uncertainties in elementary reaction rates of chemical mechanisms."
Annual Research Briefs, Center for Turbulence Research, Stanford University (2011).
pp. 161-168. (PDF)

Other presentations:

Urzay J., Ott D.W. and Prakash M., "The unique low-Reynolds spinning hydrodynamics of release of a multinucleate multiflagellate giant zoospore."
(link to video entry at Gallery of Fluid Motion)
67th annual meeting, American Physical Society, Division of Fluid Dynamics, San Francisco CA (2014).

Thesis Manuscripts:

Ph.D. Thesis: Urzay J., "Theoretical studies on spiral edge-flame propagation and particle hydrodynamics".
Department of Mechanical and Aerospace Engineering, University of California San Diego, USA (2010). (PDF)

B.Sc./M.Sc. Thesis: Urzay J., "Fluidodinamica de chorros laminares ligeros" (in spanish).
Department of Thermal Engineering and Fluid Mechanics, Carlos III University of Madrid, Spain (2005). (PDF)




Contact Information

Center for Turbulence Research
Stanford University
488 Escondido Mall, Bldg. 500
Stanford, CA 94305, USA.
Email: jurzay@stanford.edu
Office: 206 CTR Building
Ph. #: +1 650 799 3806




In Memory of Katie Osterday: An amazing woman, scientist and friend