V. Gregory Weirs

Computational Science

Author profile picture

Computational Science

vgweirs@sandia.gov

(505) 845-2032

Sandia National Laboratories, New Mexico
P.O. Box 5800
Albuquerque, NM 87185-1320

Biography

I am a Senior Member of the Technical Staff in the Computational Science Department. My expertise by training is computational fluid dynamics for compressible reacting flows, and these remain at the core of my recent projects. At Sandia I have also focused on verification and validation (V&V) and uncertainty quantification (UQ) for numerical simulations, and data analysis and visualization.

Education

I earned degrees from North Carolina State University (BS, MS) and the University of Minnesota (PhD), all in Aerospace Engineering. My research backround includes compressible fluid dynamics, shock physics, reactive flows, and turbulent flows, and on the numerical methods for simulating them. After a research associate position at the University of Chicago ASC Center on Astrophysical Thermonuclear Flashes, I came to Sandia in 2005.

Publications

Brian Andrew Freno, Brian Carnes, V. Gregory Weirs, (2020). Code-Verification Techniques for Hypersonic Reacting Flows in Thermochemical Nonequilibrium 14th World Congress in Computational Mechanics https://www.osti.gov/search/identifier:1831600 Document ID: 1231248

Brian Andrew Freno, Brian Carnes, V. Gregory Weirs, (2020). Code-Verification Techniques for Hypersonic Reacting Flows in Thermochemical Nonequilibrium under consideration https://www.osti.gov/search/identifier:1650141 Document ID: 1183157

Jaideep Ray, Sarah Kieweg, Derek John Dinzl, Brian Carnes, V. Gregory Weirs, Brian Andrew Freno, Micah Andrew Howard, Thomas M. Smith, (2020). Estimation of Inflow Uncertainties in Laminar Hypersonic Double-Cone Experiments AIAA Journal https://www.osti.gov/search/identifier:1619241 Document ID: 1127683

Brian Andrew Freno, Brian Carnes, V. Gregory Weirs, (2019). Code-Verification Techniques for Hypersonic Reacting Flows in Thermochemical Nonequilibrium AIAA Aviation Forum https://www.osti.gov/search/identifier:1640588 Document ID: 973173

Brian Andrew Freno, Brian Carnes, V. Gregory Weirs, (2019). Code-Verification Techniques for Hypersonic Reacting Flows in Thermochemical Nonequilibrium AIAA Aviation Forum https://www.osti.gov/search/identifier:1640054 Document ID: 961005

Brian Carnes, Derek John Dinzl, Thomas M. Smith, V. Gregory Weirs, (2018). Code verification and numerical error estimation for use in model validation of laminar, hypersonic double-cone flows AIAA SciTech 2019 https://www.osti.gov/search/identifier:1761395 Document ID: 901887

Jaideep Ray, Sarah Kieweg, Derek John Dinzl, Brian Carnes, V. Gregory Weirs, Brian Andrew Freno, Micah Andrew Howard, Thomas M. Smith, I. Nompelis, G.V. Candler, (2018). Estimation of inflow uncertainties in laminar hypersonic double-cone experiments AIAA SciTech Forum https://www.osti.gov/search/identifier:1761392 Document ID: 901660

Sarah Kieweg, Jaideep Ray, V. Gregory Weirs, Brian Carnes, Derek John Dinzl, Brian Andrew Freno, Micah Andrew Howard, Eric T. Phipps, William J. Rider, Thomas M. Smith, Ioannis Nompelis, Graham Candler, (2018). Validation Assessment of Hypersonic Double-Cone Flow Simulations using Uncertainty Quantification, Sensitivity Analysis, and Validation Metrics AIAA SciTech https://www.osti.gov/search/identifier:1761106 Document ID: 900337

Jaideep Ray, Sarah Kieweg, Derek John Dinzl, Brian Carnes, V. Gregory Weirs, Brian Andrew Freno, Micah Andrew Howard, Thomas M. Smith, Ioannis Nompelis, G.V Candler, (2018). Estimation of inflow uncertainties in laminar hypersonic double-cone experiments AIAA SciTech Forum and Exposition https://www.osti.gov/search/identifier:1576878 Document ID: 889911

Brian Andrew Freno, Brian Carnes, V. Gregory Weirs, (2018). Code Verification Techniques for Hypersonic Reacting Flow in Thermochemical Non-Equilibrium AIAA Aviation Forum Document ID: 889178

Sarah Kieweg, Jaideep Ray, V. Gregory Weirs, Brian Carnes, Derek John Dinzl, Brian Andrew Freno, Micah Andrew Howard, William J. Rider, Thomas M. Smith, (2018). Uncertainty Quantification, Sensitivity Analysis, and Validation Assessment of Hypersonic Double-Cone Flow Simulations AIAA SciTech Forum Document ID: 808576

Brian Carnes, V. Gregory Weirs, Thomas M. Smith, (2018). Code verification and numerical error estimation for use in model validation of laminar, hypersonic double-cone flows AIAA Science and Technology Forum https://www.osti.gov/search/identifier:1526350 Document ID: 808574

V. Gregory Weirs, L Eca, G Vaz, M Hoekstra, S Doebling, R L Singleton, G Srinivasan, V. Gregory Weirs, T Phillips, C J Roy, (2018). Assessment of Discretization Uncertainty Estimators Based on Grid Refinement Studies ASME Verification and Validation Symposium https://www.osti.gov/search/identifier:1524508 Document ID: 807852

V. Gregory Weirs, Brian Carnes, Derek John Dinzl, Micah Andrew Howard, Sarah Kieweg, Jaideep Ray, William J. Rider, Thomas M. Smith, V. Gregory Weirs, (2018). A Validation Study for a Hypersonic Flow Model ASME Verification and Validation Symposium https://www.osti.gov/search/identifier:1515624 Document ID: 796864

Brian Carnes, Marco Arienti, Erin E. Mussoni, Brian Andrew Freno, V. Gregory Weirs, Thomas M. Smith, William J. Rider, (2018). Verification for Hypersonic, Reacting Turbulent Flow ASME Verification and Validation Symposium https://www.osti.gov/search/identifier:1513346 Document ID: 796810

Brian Carnes, Derek John Dinzl, Micah Andrew Howard, Sarah Kieweg, Jaideep Ray, William J. Rider, Thomas M. Smith, V. Gregory Weirs, (2018). A Validation Study for a Hypersonic Flow Model ASME Verification and Validation Symposium Document ID: 760623

Brian Carnes, Marco Arienti, Brian Andrew Freno, Erin E. Mussoni, V. Gregory Weirs, Thomas M. Smith, (2018). Verification for Hypersonic, Reacting Turbulent Flow ASME Verification and Validation Symposium 2018 https://www.osti.gov/search/identifier:1513654 Document ID: 749920

Vicente J. Romero, V. Gregory Weirs, (2017). A Class of Simple and Effective UQ Methods for Sparse Replicate Data applied to the Cantilever Beam End-to-End UQ Problem AIAA Non-Deterministic Approaches Conference, SciTech 2018 https://www.osti.gov/search/identifier:1489719 Document ID: 737976

Vicente J. Romero, 2017) Matthew Bonney (Sandia intern departed June, Benjamin B Schroeder, V. Gregory Weirs, (2017). Evaluation of a Class of Simple and Effective Uncertainty Methods for Sparse Samples of Random Variables and Functions https://www.osti.gov/search/identifier:1409725 Document ID: 692983

Vicente J. Romero, V. Gregory Weirs, (2017). A Class of Simple and Effective UQ Methods for Sparse Replicate Data applied to the Cantilever Beam End-to-End UQ Problem 20th Non-Deterministic Methods Conference, 2018 AIAA SciTech Forum https://www.osti.gov/search/identifier:1510913 Document ID: 692777

V. Gregory Weirs, Justin Winokur, (2017). A Summary of Modeling and Simulation Assessment Techniques LANL Computational Physics Summer School https://www.osti.gov/search/identifier:1460263 Document ID: 637326

Vicente J. Romero, V. Gregory Weirs, (2017). A Class of Simple and Effective UQ Methods for Sparse Replicate Data applied to the Cantilever Beam End-to-End UQ Problem AIAA SciTech 2018 Document ID: 625663

V. Gregory Weirs, (2017). Solution Verification Using the Robust Multi-Regression Approach ASME Verification and Validation Symposium https://www.osti.gov/search/identifier:1457898 Document ID: 623735

V. Gregory Weirs, (2017). Solution Verification Using the Robust Multi-Regression Approach ASME Verification and Validation Symposium Document ID: 578441

V. Gregory Weirs, (2016). A Summary Of Modeling and Simulation Assessments Techniques 2016 LANL Computational PhysicsSummer School https://www.osti.gov/search/identifier:1371814 Document ID: 475921

V. Gregory Weirs, (2016). Solution Verification for Field Variables ASME Verification and Validation Symposium 2016 https://www.osti.gov/search/identifier:1364695 Document ID: 443505

Brian Carnes, Steven W. Bova, Travis C. Fisher, V. Gregory Weirs, Timothy Michael Wildey, (2016). Discretization error transport for unstructured CFD ASME Verification and Validation Symposium https://www.osti.gov/search/identifier:1422082 Document ID: 443400

V. Gregory Weirs, (2016). Solution Verification for Field Variables ASME Verification and Validation Symposium 2016 Document ID: 397514

V. Gregory Weirs, James R. Kamm, (2015). A Summary Of Modeling and Simulation Assessments Techniques 2015 LANL Computational Physics Summer Workshop https://www.osti.gov/search/identifier:1262622 Document ID: 307830

Travis C. Fisher, Steven W. Bova, V. Gregory Weirs, Timothy Michael Wildey, (2015). Propagating Discretization Error Estimates in Compressible Turbulent Flow Simulations Engineering Sciences External Review Poster Session https://www.osti.gov/search/identifier:1246879 Document ID: 243637

William J. Rider, R. Kamm James, V. Gregory Weirs, (2015). Verification, Validation and Uncertainty Quantification for CGS Coarse Grain Simulation https://www.osti.gov/search/identifier:1427241 Document ID: 219468

V. Gregory Weirs, Jim (LANL) Kamm, (2014). A Summary Of Modeling and Simulation Assessments Techniques 2014 LANL Computational Physics Summer Workshop Document ID: 101787

Otto Erik Strack, John Henry Judah Niederhaus, William J. Rider, Michael K. Wong, Edward Love, Stewart John Mosso, V. Gregory Weirs, Thomas E. Voth, Marlin E. Kipp, Richard R. Drake, David M. Hensinger, Sharon Petney, Duane A. Labreche, (2013). ALEGRA Training ALEGRA Training at the HEAT Center Document ID: 5270650

Allen C. Robinson, Otto Erik Strack, William J. Rider, John Walter, Kristi Brislawn, Edward Love, Thomas E. Voth, Stewart John Mosso, John Henry Judah Niederhaus, Sharon Petney, Richard R. Drake, V. Gregory Weirs, Brian M. Adams, Dena Vigil, John H. Carpenter, Christopher J. Garasi, Michael K. Wong, Joshua Robbins, Christopher Siefert, Ann Elisabet Wills, Susan carroll, Duane LaBreche, Chris Kueny, Chris Luchini, Timothy G. Trucano, Pavel B. Bochev, Randall M. Summers, James R. Stewart, Curtis C. Ober, Thomas A. Haill, Raymond W. Lemke, Kyle Cochrane, Michael P. Desjarlais, (2013). ALEGRA Update: Modernization and Resilience Progress Multimat2013 https://www.osti.gov/search/identifier:1115141 Document ID: 5327018

George Edgar Orient, Brian Carnes, Vicente J. Romero, Laura Painton Swiler, V. Gregory Weirs, (2013). Proposal for FY14 V&V Challenge Workshop ASME V&V Symposium https://www.osti.gov/search/identifier:1115651 Document ID: 5321954

James R Kamm, V. Gregory Weirs, Laura Painton Swiler, Brian M. Adams, William J. Rider, Michael S. Eldred, Marco Ratto, Stefano Tarantola, (2012). A Sensitivity Analysis of the Gas Dynamics Equations XII International Workshop on Supercomputing and Mathematical Modeling https://www.osti.gov/search/identifier:1121790 Document ID: 5287745

Sherrika D Daniel, V. Gregory Weirs, Edward Love, Scott D. Ramsey, Frank X. Timmes, (2011). Dynamic Compressible Flow Verification Problems: Oldies but Goodies Workshop on Verification and Validation in Computational Science https://www.osti.gov/search/identifier:1118504 Document ID: 5300636

Jean-Paul Davis, Dawn Gustine Flicker, Raymond W. Lemke, Matthew R Martin, Charles S Alexander, Thomas A. Haill, Tommy Ao, Daniel H. Dolan, James Matthew Doyle Lane, Aidan P. Thompson, Richard R. Drake, V. Gregory Weirs, James R. Asay, Jon Eggert, Carl Greeff, Neil Holmes, Camille Chauvin, Jacques Petit, Raymond F. Smith, Simon N. Bland, Christophe Voltz, Douglas G. Tasker, Pierre-Yves Chanal, Daniel Orlikowski, Roger W. Minich, Joshua Robbins, Jow Ding, Jeffrey H. Nguyen, Bryan W. Reed, (2011). 4th Workshop on Ramp Compression 4th Workshop on Ramp Compression https://www.osti.gov/search/identifier:1671679 Document ID: 5292120

Sherrika D Daniel, James R Kamm, V. Gregory Weirs, (2011). The Role of Theory in Calculation Verification SIAM CSE Meeting https://www.osti.gov/search/identifier:1120909 Document ID: 5291619

Kenneth D. Moreland, Elmer Alfonso Chavez, V. Gregory Weirs, Thomas A Brunner, Timothy G. Trucano, David B. Karelitz, Timothy M. Shead, (2007). Post-Processing V&V Level II ASC Milestone (2360) ResultsMilestone (2360) Results https://www.osti.gov/search/identifier:933216 Document ID: 5255718

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Awards & Recognition

2013

Brian M. Adams, Lara E Bauman, William J Bohnhoff, Ethan Chan, Keith R Dalbey, Mohamed S Ebeida, Michael S Eldred, Patricia D Hough, Kenneth Hu, John D Jakeman, George E Orient, Laura P Swiler, V. Gregory Weirs, Team Employee Recognition Award, Sandia National Laboratories, For demonstrated success in transforming Dakota to a production computational tool in support of Sandia's core NW mission and a growing external customer base, April 22, 2013

2012

V. Gregory Weirs, SPOT Award, Sandia National Laboratories, "For outstanding work in leading the development of Prism and providing training in its use.", April 24, 2012