Advanced Simulation & Computing at NNSA An Overview July 2008 Njema Frazier, PhD
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Defense Programs Advanced Simulation & Computing at NNSA An Overview Njema Frazier, PhD Acting Deputy Director, Office of Advanced Simulation and Computing July 2008 CFO Office Briefing August 9, 2007 1 Our Business: Using simulation and computing to maintain the US nuclear deterrent Defense Programs Central Problem: Replacement of underground testing with a rigorous scientific methodology with which to assess and maintain our confidence in our nuclear stockpile. Time Urgencies: Supporting national policy with respect to the maintenance of our nuclear stockpile requires that we be able to certify annually to the Secretaries of the Departments of Energy and Defense that the stockpile is safe, reliable and secure. ASC Solution: A National Program planned and coordinated across the three Defense Program Laboratories with partnerships with academic centers and industry. CFO Office Briefing August 9, 2007 2 ASC Simulation serves Today’s Nuclear Stockpile W80 W76, W88 W62, W78 TLAM-N W87 PK D5 Provide the science-based capability to assess and certify the safety, performance and reliability of nuclear weapons and their components without nuclear testing W80 MM III Peacekeeper ACM B61, W80, B83 B-52 • • • • • Defense Programs B61 F-16 Safety Calculations B61, B83 Life Extension Program Engineering Simulations Annual Stockpile Certification Significant Findings Investigations CFO Office Briefing August 9, 2007 B61, B83 F-15E W80 B-2A ALCM 3 NA-10 Organization Defense Programs (NA – 1) NNSA Administrator Thomas D'Agostino Principal Deputy Administrator William C. Ostendorff (NA – 10) CFO Office Briefing August 9, 2007 4 NA-12 Organization Defense Programs CFO Office Briefing August 9, 2007 5 NA-121.2 – ASC Sub-Programs Defense Programs • Integrated Codes: • – Incorporate more accurate representations of physics phenomena into modern multi-physics codes, maintain legacy codes, and conduct critical research in numerical algorithms Physics and Engineering Models: • – Develop microscopic and macroscopic models of physics and material properties, as well as improved numerical approximations to the simulation of transport for particles and x-rays. Verification and Validation: • – Assess code precision in numerical approximations and the accuracy of these numerical approximations: Verification. Assess models’ accuracy by comparing model predictions with experimental data: Validation. Computational Systems and Software Environment: • – Design, procure, deliver and deploy the ASC computational systems and user environments via technology development and integration at the DP laboratories Facility Operations and User Support: – Support system operations for reliable production computing and storage environments as well as a suite of user services for effective use of ASC tri-lab computing resources CFO Office Briefing August 9, 2007 6 Stockpile Stewardship Program Decision-Basis Defense Programs Simulation U F U SU t Lc U 0 Theory Computing Science, Small-scale experiments, Subcrits CFO Office Briefing August 9, 2007 Integrated experiments, UGT database Surveillance 7 The Evolving role of simulation supporting the nuclear deterrent Defense Programs 2006 ++ 1992-2005 Early Stewardship Era 1943-1992 Historically • Simulation supports design and test-based certification • Largely empirical physics treatments CFO Office Briefing August 9, 2007 • Capability demos and selected studies show the potential of ASC Technology • Continued reliance on Legacy tools for interpolation • 100 Teraflop goal Stewardship within a Responsive Infrastructure • ASC technology becomes the dominant means for Stewardship • Validation methodologies for multi-scale science simulations • Access to multi-petascale computing • Application to a variety of national security issues 8 Certifying a highly complex system WITHOUT testing after 20 years… • • • • Defense Programs Many body Strongly Coupled Millions of Degrees of Freedom Numerous Systems Issues: – – – – As-built issues Aging issues Replacement of materials Improved safety, security • High-consequence, riskinformed decisions CFO Office Briefing August 9, 2007 9 We must eliminate obstacles to high fidelity simulation HE EOS Pu EOS Defense Programs U EOS Radiation transport 3D effects HE Detonation Secondary materials Fission Primary mix Opacities Fusion • We must reduce errors caused by: – Use of 1D or 2D approximations for 3D objects – Insufficient spatial resolution – Physical or numerical approximations CFO Office Briefing August 9, 2007 10 The Defense National Laboratories Stewards of S&T Defense Programs 1. Facilities Los Alamos Lawrence Livermore 2. Technology 3. Expertise Sandia Nevada Test Site 4. Mission-Requirement CFO Office Briefing August 9, 2007 11 Many micro-physics issues remain to be understood • Weapons Physics issues – – – – – – • Defense Programs Radiation transport in complex mixtures Neutron transport Hydrodynamic instabilities Electron-ion relaxation Plasma collective & kinetic effects in TN burn Damage modeling Basic Physics in other important missions – – – – – – Supernova explosions Space exploration Fusion plasmas Cloud modeling for climate codes New materials and material response Structural Genomics CFO Office Briefing August 9, 2007 12 Final Words Defense Programs • ASC Vision: – Predict, with confidence, the behavior of nuclear weapons, through comprehensive, sciencebased simulations. • ASC Mission: • ASC Solution: – A National Program planned and coordinated across the three Defense Program Laboratories with partnerships with academic centers and industry. – Provide leading edge, high-end simulation capabilities needed to meet weapons assessment and certification requirements. High-Consequence, Risk-Informed Decisions Necessary CFO Office Briefing August 9, 2007 13 Defense Programs CFO Office Briefing August 9, 2007 14 Headquarters Staff Defense Programs Bob Meisner Director (A) Njema Frazier Deputy Director (A) Watti Hill Physics & Engineering Models Integrated Codes Verification & Validation Njema Frazier Scott Doebling Hans Ruppel Edgar Lewis Charlie Slocomb Erich Rummel April Commodore Tina Macaluso Computational Systems & Software Environment Facility Operations & User Support Thuc Hoang Karen Pao Kim Yates Sander Lee Tinu Ogunde Fed Lab Detailee Contractor Future Leader CFO Office Briefing August 9, 2007 15