Guillermo Araya, Ph.D

Guillermo Araya, Ph.D

Associate Professor

Computational Fluid Dynamics

Office: OF-412
T: 787-832-4040 x5720


  • Ph.D.
Rensselaer Polytechnic Institute, Troy, NY, 2008
  • M.S.
University of Puerto Rico at Mayagüez, Mayagüez, PR, 2004
  • B.S.
Instituto Universitario Aeronautico, Cordoba, Argentina, 1996


  • 2015-present
Associate Professor, Department of Mechanical Engineering, University of Puerto Rico at Mayagüez
  • 2011-2015
Research Assistant Professor, Department of Mechanical Engineering, Texas Tech University, Lubbock, Texas.
  • 2008-2011
Research Assistant, School of Engineering, Civil and Computational Engineering Centre, Swansea University, UK.

Academic and Professional Leadership

  • Senior Member of American Institute of Aeronautics and Astronautics (AIAA)
  • Member of the American Physical Society (APS)

Journal Publications

  • Liu C., Araya G.(*) and Leonardi S., The role of vorticity in the turbulent/thermal transport of a channel flow with local blowing, in press, Computers and Fluids, 2017.
  • Gutierrez W., Araya G., Kiliyanpilakkil V.P., Ruiz-Columbie A., Tutkun M. and Castillo L.(*) Structural impact assessment of Low Level Jets over wind turbines, J. of Renewable and Sustainable Energy, 8, 023308, 2016.
  • Dharmarathne S., Tutkun M., Araya G., Castillo L.(*), Structures of scalar transport in a turbulent channel, European Journal of Mechanics B-Fluids, Vol. 55, Part 2, pp 259-271, 2016.
  • Araya G.(*), Castillo L. and Hussain F., The log behavior of the Reynolds shear stress in accelerating turbulent boundary layers, J. of Fluid Mechanics, Volume 775, pp 189 – 200 2015.
  • V. P. Kiliyanpilakkil, S. Basu (*), A. Ruiz-Columbié, Araya G., L. Castillo, B. Hirth, and W. Burgett, Buoyancy effects on the scaling characteristics of atmospheric boundary-layer wind fields in the mesoscale range, Phys. Rev. E 92, 033005, 2015.
  • Doosttalab A., Araya G.(*), Newman J., Adrian R., Jansen K., Castillo L., Effect of small roughness elements on thermal statistics of a turbulent boundary layer at moderate Reynolds number, J. of Fluid Mechanics, Vol. 787, pp 84 – 115, 2015.
  • Cardillo J., Chen Y., Araya G.(*), Newman J., Jansen K. and Castillo L., DNS of turbulent boundary layers with surface roughness, J. of Fluid Mechanics Vol. 729, pp 603 – 637 2013.
  • Araya G.(*) and Castillo L., DNS of turbulent thermal boundary layers subjected to adverse pressure gradients, Physics of Fluids, 25, 095107 2013.
  • Araya G.(*) and Castillo L., DNS of turbulent thermal boundary layers up to Reθ = 2300, Int. Journal of Heat and Mass Transfer, Volume 55, Issues 15–16, 4003-4019, 2012.
  • Araya G.(*), Castillo L., Meneveau C. and Jansen K., A dynamic multi-scale approach for turbulent inflow boundary conditions in spatially evolving flows, J. of Fluid Mechanics Vol. 670, pp. 581–605, 2011.
  • Araya G.(*), Leonardi S. and Castillo L., Steady and time-periodic blowing/suction perturbations in a turbulent channel flow, Physica D 240 pp. 59–77, 2011.
  • Araya G.(*), Jansen K. and Castillo L., Inlet condition generation for spatially-developing turbulent boundary layers via multi-scale similarity, J. of Turbulence, 10, No. 36, pp. 1-33, 2009.
  • Araya G.(*), Leonardi S. and Castillo L., Numerical assessment of local forcing on the heat transfer in a turbulent channel flow, Physics of Fluids, 20, 085105, 2008.
  • Araya G.(*), Leonardi S. and Castillo L., Passive scalar statistics in a turbulent channel with local time-periodic blowing/suction at walls, Physica D, 237, pp. 2190–2194, 2008.

(*) indicates corresponding author

Distinctions & Awards

  • Travel award to attend the 69th Annual Meeting of the APS Division of Fluid Dynamics (November 20-22, 2016 Portland, OR) provided by XSEDE.
  • Travel award by XSEDE to attend “Inquiry-Based Science and Mathematics Enhanced by Computational Thinking” workshop at Oklahoma State University, May 16 – 18, 2016.
  • Selected for inclusion in the 11th Edition of Marquis Who’s Who in Science and Engineering (2011 – 2012)
  • Annual Summer Institute: Reducing Your Time To Solution, San Diego Supercomputer Center (July 2007, La Jolla, CA
  • Selected as young participant in the “Euler Equations: 250 Years On” conference with travel subsidy from NSF (June 2007, Aussois, France)
  • Travel subsidy award from European Commission (Marie Curie program) for participating in the 11th European Turbulence Conference (June 2007, Porto, Portugal)
  • Travel subsidy awards (2005 and 2006): Division of Fluid Dynamics of the American Physical Society.
Flow control of turbulent “superstructures” (NSF#1512393 and NASA PR Space Grant Fellowship)

This study involves incompressible Direct Numerical Simulation (DNS) of turbulent flows to evaluate the effects of small flow changes close to a solid wall on the development of very long eddies farther downstream.

Effects of wall curvature on hypersonic boundary layers (AFOSR#FA9550-17-1-0051, in collaboration with the U. of Colorado-Boulder)

We seek to develop a robust turbulent inflow generation methodology for hypersonic spatially-developing turbulent boundary layers (SDTBL) with Mach numbers up to 5 in a suite of high spatial/temporal resolution Direct Numerical Simulation (DNS) as well as Large Eddy Simulation (LES) at higher Reynolds numbers.

High-end visualization of coherent structures and turbulent events in wall-bounded flows (NSF-GECAT #1440733, in collaboration with the Barcelona Supercomputing Center, Spain)

This project focuses on creating time-dependent, 3D flow visualizations. As with most visual simulations, the amount of data required is massive and nearly impossible to sift through without robust parallel computing infrastructure. The GECAT program enables this visualization to be possible by connecting Dr. Araya with one of Europe’s strongest HPC centers, the Barcelona Supercomputing Center, in order to provide the parallel processes necessary to perform these intricate, data-intensive visualizations at a speed that would otherwise be impossible.

Turbulence modelling for aerospace applications (XSEDE #CTS170006)

Computational Fluid Dynamics (CFD) is significantly gaining ground in the area of aerospace research due to its relative low cost, high accuracy and versatility. Particularly during the design stage of an airplane, it is possible to obtain fast results of different configurations, and, thus minimize the time and the expense of building a wind tunnel model and testing it. Furthermore, with the recent advent of petascale supercomputers with hundreds of thousands of cores, the running time of large scale systems, such as a complete airplane, has been dramatically reduced.