Dr. Roache's primary area of expertise is in the numerical solution of partial differential equations, particularly those of fluid dynamics, heat transfer, and electrodynamics, with special interest in Verification and Validation. He is the author of the original (1972) CFD book Computational Fluid Dynamics (translated into Japanese, Russian, and Chinese), the monograph Elliptic Marching Methods for Domain Decomposition, the widely referenced Verification and Validation in Computational Science and Engineering, and Fundamentals of Computational Fluid Dynamics He co-edited an ASME symposium proceedings on Quantification of Uncertainty in CFD, wrote a chapter on that subject for the 1997 Annual Reviews of Fluid Mechanics, and co-authored a Chapter in the forthcoming Handbook of Numerical Heat Transfer, 2nd Edition. He has also authored over 100 archive journal and conference publications, 2 widely referenced reviews, and 20 company reports.

His research experience includes solution-adaptive grid generation, multigrid methods, pseudo-spectral methods, modified method of characteristics, direct methods for elliptic equations, and nonlinear transcendental and least squares problems. He has developed high-order time-dependent methods for strongly transient flows and efficient semidirect methods for steady flows. With Prof. S. Steinberg, he pioneered the use of computer Artificial Intelligence (Symbolic Manipulation) CFD and variational grid generation. He developed the Tetra-ELF codes for calculation of two- and three-dimensional nonlinear electric fields in lasers. Other research interests include unsteady aerodynamics, ocean modeling, domain decomposition, groundwater flow and transport, multiphase flow in porous media, passive solar energy system modeling, free convection flows, double diffusion flows, boundary layer transition, base pressure prediction, flow visualization, analytical flight mechanics, and engineering design optimization.

Dr. Roache has extensive teaching experience, including aerodynamics, gas dynamics, boundary layer theory, flight mechanics, heat transfer, fluid dynamics, mathematics (analysis), numerical methods, and CFD, and has taught eleven short courses (six for AIAA) on Verification and Validation. He has served as Adjunct Faculty and Visiting Professor in engineering and mathematics at six universities. He has served as a consultant to government and private laboratories in both the USA and abroad; consulting contracts include the Los Alamos and Sandia National Laboratories, U.S. Army BRL, Kozo Keikaku of Japan, Flow Industries, U.S. Army Corps of Engineers, Air Force Weapons Laboratory, SAIC, LATA, RDA, BDM, and Idaho National Laboratories.

Dr. Roache served as Associate Editor for Numerical Methods for the ASME Journal of Fluids Engineering from 1985 to 1988, and co-authored that journal¿s innovative Policy Statement on the Control of Numerical Accuracy. He also chaired the AIAA Fluid Dynamics subcommittee on Publication Standards for Computational Fluid Dynamics. He has served on the Advisory Editorial Board of five other international journals. He has served on Review Boards and Committees for Computational Needs at the U.S. Army Ballistic Research Laboratories, for the New Mexico Energy Institute, for the 1980-1981 AFOSR-HTTM-Stanford Conference on Complex Turbulent Flows, and for the Maui High Performance Computing Center. He chaired a Panel to review Atmospheric Modeling proposals for the U.S. Environmental Protection Agency. He served as Task Leader for CFD for the DOE WIPP (Waste Isolation Pilot Plant) Performance Assessment. He has received career awards from the University of Cincinnati and the University of Notre Dame, and received the 1994 Knapp Award of the Fluids Engineering Division of ASME for his paper presenting the concept of the Grid Convergence Index. Memberships include ASME (Fellow), AIAA (Associate Fellow), EWRI, Sigma Xi, Philosophy of Science Association and (previously) ASCE, ASEE, APS, AGU, and SIAM. Committee work on Verification and Validaiton includes ASCE Free Surface Flow Model Verifications, ASME Committees on V&V in Computational Solid Mechanics (PTC-60) and Fluid Dynanics and Heat Transfer (PTC-61).