Lawrence J. De Chant Sandia National Laboratories PO box 5800, Albuquerque, NM 87185-0836 (home) (505) 296-3226, (work) (505) 844-4250 [email protected] [email protected]

Education

Employment History

 Doctor of Philosophy, Mechanical Engineering; Texas A&M University, (8-93 to 05-97), GPA (4.0/4.0), Graduated 05-12-97.  Master of Science, Mechanical Engineering; University of Cincinnati, Graduated (889), GPA (3.5/4.0)  Bachelor of Science, Geology; supplemented by one year of engineering fundamentals; University of Cincinnati, Graduated (6-86), GPA (3.45/4.0)

Senior Staff Member, Sandia National Laboratory, Aero-Sciences Dept., (01515)  Turbulent and transitional pressure fluctuation models for reentry body flows using Reynolds decomposed (but not averaged) expressions: Thin-layer and full fluid domain models.  RANS, URANS, combined LES/RANS aerodynamic turbulence models with applications to weapon systems (NNSA), Heavy Vehicle Transport (DOE-office of transportation, canonical method validation.  Preliminary Design Bluff body drag model based on Combined Green’s function Gram-Charlier series method  Analytical code support and validation for ASC code development Thermal and Reactive Processes Dept., (09116)  Application of analytical and numerical tools (CTH)  Analytical penetration, debris cloud, ring collapse models.  Modeling of shock impacted materials Technical Staff Member, Los Alamos National Laboratory Computer and Computational Sciences Division, CCS-2 (10-00 to 01-01)  Telluride; ASCI project; 3-d unstructured, multiple physics casting simulation model development/numerical model development  Applied Theoretical and Computational Physics Division (07-99 to 09-00)  ASCI, Accelerated Strategic Computing Initiative Code development project, Shavano, Methods development mathematical and computational support of a major Object-Oriented, Lagrange “as possible” science-based Stockpile stewardship code.  Enslaved finite difference/approximate inertial manifold (AIM) analytical and numerical analysis.  Applied mathematics research, AIM, Lagrange Hydrodynamics, Turbulent-Mix, ALE Arbitrary Lagrangian-Eulerian formulations. Post-doctoral Research Fellow, Los Alamos National Laboratory Applied Theoretical and Computational Physics Division (X-Div)(06-98 to 07-99)  Self-similarity/method-of-characteristic models  Survey of difference operator symmetry using Lie group theoretic methods  Constraint of turbulent-mix models using asymptotic/analytical models

 Enslaved finite difference/approximate inertial manifold (AIM) analytical and numerical analysis.  Development/support for Theoretical Division, T-13 and X Division, X-TA, Thermonuclear Applications group.  Department of Energy “Q” clearance, 01-99. Lead Research Scientist, Chevron Petroleum Technology Corporation CHEARS Development team; La Habra, CA. (06-97 to 06-98).  Proprietary globalization algorithm of Newton solver and nonlinear equation stability analysis for CHEARS©, Chevron Extended Application Reservoir Simulator.  3-d, flux continuous, complete permeability tensor, finite difference operator implementation. Consulting Engineer; Analytic Entrainment LLC, a contractor for NASA Glenn (Lewis) Research Center, Propulsion System Office, part-time research consultant; Principal Investigator. 06-99 to curr.  Multiple stream (N≥2) mixing and turbulent mixing with combustion Extensions to Differential Reduced ejector Analysis (DREA); Contract NAS 3 99193; 09-99 to 09-01. 100K with contraact extension: “Extension of the DREA DIfferential reduced ejector analysis code for unsteady, periodic flow,” NASA Glenn Research Center 24K.  Mathematical/numerical development of VA SLIMIT Variable Area Subsonic Limit

code; a preliminary design level model for delimiting physical constraints imposed upon subsonic ejector operation in variable area mixing duct ejector nozzles. Consulting Engineer; Modern Technologies Corp. a contractor for NASA Lewis Research Center, Propulsion System Analysis Office, part- time research consultant (0198 to 09-98); (12-02 to 03-03)  Mathematical/numerical development in support of extensions and improvement to the DREA, Differential Reduced Ejector Analysis Model.

Consulting Engineer; NYMA Corporation a contractor for NASA Lewis Research Center, Propulsion System Analysis Office and HSR, High Speed Research Project Office. (06-09-97 to 06-20 97).  Mathematical/numerical development of SLIMIT Subsonic Limit code; a preliminary design level model for delimiting physical constraints imposed upon subsonic ejector operation. Class Instructor; Texas A&M University (09-96 to 12-96)  MEEN346: Fluid Mechanics and Heat Transfer  Developed materials, examinations, lectured and assigned final grades for 46 junior/senior, engineering, undergraduate students for introductory fluids and heat transfer class; Supervised grader Petroleum Engineer; Amoco Exploration Production Technology Group, Tulsa, OK; (05-13-96 to 08-21-96), summer position.  Development and implementation of a series of optimization methods combined with a single phase fractured well simulator GAS3D, applied to history matching project.  Methods included a genetic, Levenberg Marquardt, and a newly written parallel direct search algorithm implemented on a 16 node SGI-Power Challenge, using PVM (Parallel Virtual Machine) message passing software. Research Assistant, Texas A&M University, (09-93 to 05-97)

sponsored by NASA Lewis Research Center, NGSRP Scholarship Award, 94-97, Experimental Validation/Calibration Grant,94-95, Grant NAG3-1512, 93-94.  Developing a combined perturbation/numerical analysis and code with application to ejector/mixer nozzle and geophysical flows.  Experimental Hydraulic Analog model of supersonic ejector design, fabrication and operation. Research Engineer; Sverdrup Technology, a contractor for NASA Lewis Research Center, Methods Development Branch (8-89 to 8-93) Cleveland, OH.  Concentrating upon the development of analytical and computational methods for aeropropulsion applications using classical mathematical techniques.  Development projects include: Rapid estimation of flow losses for propulsion applications, An analytical skin friction formula for internal high speed flow, An analytical ejector/mixer modeling technique.  Supervising: 2 Summer interns.  Security clearance level: secret. Graduate Teaching Assistant; University of Cincinnati (9-87 to 6-89), Cincinnati, OH,  Taught and/or assisted FORTRAN recitation, Fluid Thermal Lab, Fluids I.  Developed experimental apparatus, data reduction software and manuals.

Publications Refereed Journals (1) “On the Interface and Wavelength Between Supersonic Jets and Subsonic Flow Fields”, AIAA Journal, Vol. 34, No. 9, Sept. 1996, pp. 1946-1948. (2) “Interface Wavelength Between Confined Supersonic Two-dimensional Jets and Subsonic Streams,” L. De Chant, J. Caton and M. Andrews, AIAA Journal, Vol. 35, No. 7 July 1997, pp. 1219-1221. (3) “Measurement of Confined Supersonic, 2-d Jet Lengths Using the Hydraulic Analogy,” L. De Chant and J. Caton, Experiments in Fluids, Vol. 24, No. 1, January, pp. 58-65. (4) “Analytical Solutions for Diffusive Finite Reservoir Problems Using a Modified Orthogonal Expansion Method,” L. J. De Chant, Mathematical and Computer Modeling, 28 No. 11 pp73-76. (5) “An Analytical Skin Friction and Heat Transfer Model for Compressible, Turbulent, Internal Flows,” L. J. De Chant, International Journal of Heat and Fluid Flow, 19, 1998, 623-628. (6) “Formation of Small Scale Folds and Faults in Northern Ohio,” L. J. De Chant, Engineering Geology, 50, 1998, 329-335. (7) “Modeling Alluvial Fan Morphology,” L. De Chant, P. Pease, V. Tchakerian; Earth Surface Processes and Landforms, 24, 641-652. (8) “A Perturbation Model for the Oscillatory Flow of a Bingham Plastic in Rigid and Elastic Tubes,” L. J. De Chant, Trans. ASME, Journal of Biomechanical Engineering, 121, 1999, pp. 502-504. (9) “A Combined Analytical Singularity Subtraction Method and Compact Implicit Differencing Scheme for Aerodynamic Mixing” L. J. De Chant and M. J. Andrews, Mathematical and Computer Modeling, 31, 2000, 21-38. (10) “Simplified Turbulence Modeling for Forced Vortical Mixers Using a Kinematic Wave Analogy,” L. De Chant and J. Seidel,, Applied Mathematical Modeling 25, (2001), 427-447. (11) “Analytical Development of Non-Ideal Effects for Control Volume Based Mixer Models,” L. De Chant and J. Seidel, Applied Thermal Engineering, 21 (15) 2001, 1521-1533.

(12) “A Computationally Implementable Criterion for Solvability of Boundary Value Problems on an Infinite Domain,” L. De Chant, Applied Mathematics and Computation, 125 (2002) 35-47. (13) “Multiple Stream Superposition of a Two-Stream Combined Analytical Numerical Initial Value Problem Solver for Aerodynamic Mixing,” L. De Chant and J. Seidel, Computers and Mathematics with Applications, 43 (10-11) 05-06 2002, 1451-1468 (14) “Subsonic Ejector Nozzle Limiting Flow Conditions,” Lawrence J. De Chant, ASME Journal of Engineering for Gas Turbines and Power, Vol. 125, July 2003, 851-855. (15) “Turbulent, Mixing of a Scalar Quantity in a 2-d Mixing Layer Using Matched Asymptotic Expansions,” L. J. De Chant, Applied Mathematical Modeling, 27-12, 955962. (16) “Impulsive Displacement of a Quasi-linear Viscoelastic Material Through Numerical Inversion of the Laplace Transform”, L. J. De Chant, Computers and Mathematics with Applications, 43, (2002) 1161-1170. (17) “Introduction of Non-uniformity through Linearization of the System Governing Turbulent, Mixing of a Scalar Quantity in a 2-d Mixing Layer,” L. J. De Chant, Applied Mathematics and Computation, 130 2-3, pp 399-413. (18) “A Dynamic Pressure/Quasi-Steady Mass Conservation Approximation Based Kinematic Wave Model for High Speed Flows”, Lawrence J. De Chant, submitted to International Journal of Nonlinear Mechanics, 06-03. (19) “An Analytical Model for Material Line Kinematics in Steady and Unsteady Buoyancy Driven Flows in 2-D Channels”, Chemical Engineering Science, 57 (2002) 2765-2771 (20) “Quasi-steady Approximations to Initial Value Problems with Application to Sediment Transport”, Lawrence J. De Chant, Applied Mathematics and Computation, 134, 2-3, 2003, pp 535-552. (21) “Extension of a Combined Analytical/Numerical Initial Value Problem Solver for Turbulent Mixing with Combustion,” L. De Chant, T. Kline, J. Seidel, Computers and Fluids, 32, 2003, 1435-1452. (22) “Extension of a Combined Analytical/Numerical Initial Value Problem Solver for Unsteady Periodic Flow” Lawrence J. De Chant, Jonathan A. Seidel and Teresa R. Kline, International Journal for Numerical Methods in Fluids, 40, 9 Nov pp. 11631186. (23) “A High Velocity Plate Penetration Hole Diameter Relationship Based on Late Time Stagnation Point Flow Concepts” L. De Chant, Applied Mathematics and Computation, 170, 1, 2005, pp 410-424. (24) “Approximate Inertial Manifold Based Finite Difference operators and Quasi-steady solutions with Application to Sediment Transport, L. De Chant, Mathematical and Computer Modeling, 40, 1-2, 2004, pp. 11-21. (25) “Braided Stream Bedload Sediment Transport Rates from a Quasi-Steady Alluvial Fan Diffusivity Model,” L. J. De Chant, Environmental and Engineering Geoscience, 10, 2, 2004, pp 95-102 (26) “Implementation of a Flux-Continuous Finite Difference Method for Stratigraphic, Hexahedron Grids,” S. Lee, H. Tchelepi, P. Jenny and L. De Chant, Society of Petroleum Engineering Journal, 09-02, pp 267-277. (27) “An Analytical Solution for Unsteady, Inviscid Jet Formation Due to Asymmetric 2d Ring Collapse” L. J. De Chant, International Journal of Impact Engineering, 30, 6, pp. 685-698. (28) “Development of an Elementary Quantitative Competing Species Model: Practical Guidelines for Exotic/Weed Plant Species Eradication/Control and Ecosystem Restoration Programs,” by L. J. De Chant and C. J. De Chant, Ecological Engineering, 22, (2004), pp. 67-75.

(29) “An Analytical Solution for Unconfined, Unsteady, Inviscid Jets; with Applications to Penetration Problem Debris Cloud Formation” 48, #2, 201-213. (30) “An explanation for the Minimal Effect of Plate Curvature on High Velocity Penetration Hole Formation,” L. J. De Chant, International Journal of Solids and Structures, 41, 2004, pp. 4163-4177. (31) “Validation of a Computational Implementation of the Grady-Kipp Dynamic Fragmentation Theory for Thin Metal Plate Impacts Using an Analytical Strain-Rate Model and Hydrodynamic Analogues”, Mechanics of Materials, 37, 83-94. (32) “The Venerable 1/7th Power Law Turbulent Velocity Profile: A Classical Nonlinear Boundary Value Problem Solution and Its Relationship to Stochastic Processes,” Applied Mathematics and Computation, 161, 463-474, (2005). (33) “A Semi-infinite Domain Eigenvalue Problem Describing Turbulent Velocity Fluctuations”, L. J. DeChant, Computers and Mathematics with Applications, 60, 5 2010. (34) “Expression for Supersonic Fluctuating Drag Force Magnitude Due to Ambient Thermodynamic Disturbances,” L. De Chant, AIAA Journal, V 48, #12, 2010, pp. 2976-2977. (35) “An Implicit Differential Equation Governing Lumped Capacitance, Radiation Dominated, Unsteady, Heat Transfer,” L. DeChant, accepted for publication International Journal of Numerical Methods for Heat and Fluid Flow, 04-11. (36) “A Simple Model to Estimate Turbulent Density Fluctuation and Associated Optical Distortion Over Hydro-dynamically Rough Surfaces,” L. DeChant accepted for publication 06-11 Mathematical and Computer Modeling (37) “Self Induced Turbulent Velocity and Pressure Fluctuations for 2-d Channels and Flat Plates Using Rapid Distortion Theory,” L. DeChant, in Press Corrected Proof, 05-11. (38) “The Effect of Free-Stream Velocity Disturbances on Hypersonic Vehicles,” submitted to AIAA Journal of Spacecraft and Rockets 05-11. (39) ”Modification to the k-omega Turbulence Model for Vortically Dominated Flows,” submitted to Computers and Fluids, 08-11.

Conference

(1) L. De Chant (2004); 2-d Bluff Body Drag Estimation Using a Green's Function/GramCharlier Series Approach, AIAA, Portland, OR, June 2004. (2) L. De Chant and M. F. Barone (2005), 3-d bluff body drag estimation using a Green's function/Gram-Charlier Series Approach, AIAA, Reno, NV, January 2005. (3) A Convection Diffusion Reaction (CRD) Model for 2-d Transition Pressure Fluctuation Behavior, AIAA, Vancouver, 2008. (4) “Estimating Turbulent Wall Shear and Boundary Layer Thickness for Hydrodynamically Rough Surfaces by Perturbing Known Smooth Results,” Orlando, January, 2010. (5) “Modification to the k-Omega Turbulence Model for Vortically Dominated Flows,”, AIAA Orlando, 2011. (6) “An Approximate Expression for Base Pressure Fluctuation Spectra for Bluff Bodies,” AIAA Orlando, 2011.

References

 Dr. Jerald. A. Caton (Committee co-chair, Mechanical Engineering, former department head) 409-845-5337, [email protected].  Dr. Malcolm Andrews (Committee co-chair, Mechanical Engineering) 409-845-8843, [email protected].  Dr. Thomas A. Blasingame (Committee member, Petroleum Engineering) 409-8452292, [email protected].  Mr. Jonathan A. Seidel NASA Glenn R. C. Technical Supervisor, 216-977-7039, [email protected].