The NRC ESSI Simulator
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1 B. Jeremić, A. Kammerer, N. Tafazzoli, B. Kamrani University of California, Davis, CA Lawrence Berkeley National Laboratory, Berkeley, CA U.S. Nuclear Regulatory Commission, Washington DC SMiRT 21, New Delhi, India, November 2011
2 Outline Introduction NRC ESSI Simulator System NRC ESSI Simulator Program NRC ESSI Simulator Computer NRC ESSI Simulator Notes Verification and Validation V&V Intro Model/Mesh Verification Summary
3 Outline Introduction NRC ESSI Simulator System NRC ESSI Simulator Program NRC ESSI Simulator Computer NRC ESSI Simulator Notes Verification and Validation V&V Intro Model/Mesh Verification Summary
4 Introduction U.S.-NRC need: high fidelity (Hi-Fi) modeling and simulation of seismic response of NPPs 3 dimensional, inclined, body and surface, uncorrelated, realistic seismic waves Material nonlinear behavior of the rock, soil, interfaces/contacts, isolators, concrete, steel High performance computing (parallel) Verification and Validation for high confidence in predictions Documentation, user friendly, Education (U.S.-NRC staff capacity building) Project: Development of the NRC ESSI Simulator System
5 Outline Introduction NRC ESSI Simulator System NRC ESSI Simulator Program NRC ESSI Simulator Computer NRC ESSI Simulator Notes Verification and Validation V&V Intro Model/Mesh Verification Summary
6 Project Goals Development of the NRC ESSI Simulator System for Hi-Fi modeling and simulation of earthquake soil/rock structure interaction problems: NRC-ESSI-Program NRC-ESSI-Computer NRC-ESSI-Notes Education: NRC Staff Capacity Building (seminars, short courses, NRC ESSI Notes, advising) Development of ESSI case studies: 3D, inclined seismic motions, soil/rock; foundation interface slip, seismic energy propagation dissipation
7 NRC ESSI Simulator System The NRC-ESSI-Program is a 3D nonlinear parallel finite element program specifically developed for Hi-Fi modeling and simulation of Earthquake Soil/Rock Structure Interaction problems for NPPs on NRC-ESSI-Computer. The NRC-ESSI-Computer is a distributed memory parallel computer, a cluster of clusters with multiple performance processors and multiple performance networks. The NRC-ESSI-Notes represent a hypertext documentation system detailing modeling and simulation of NPP ESSI problems.
8 NRC ESSI Simulator Program NRC ESSI Simulator Program Based on a Collection of Useful Libraries (modular, portable) Library centric software design Various public domain licenses (GPL, LGPL, BSD) Verification and Validation Program documentation (part of NRC ESSI Notes) Target users: U.S.-NRC staff, UCD, UB students, external users Sources will be available through
9 NRC ESSI Simulator Program Collection of Useful Libraries (Modeling Part) Template3D-EP libraries for elastic and elastic-plastic computations (UCD, LGPL) FEMTools finite element libraries provide finite elements (solids, beams, shells, contacts/isolators, seismic input) (UCD, UCB, CU, LGPL) Domain Specific Language for input (C-binding) (UCD, LGPL)
10 NRC ESSI Simulator Program Collection of Useful Libraries (Simulation Part) Plastic Domain Decomposition (PDD) for parallel computing (UCD, LGPL) PETSc (ANL, GPL-like) and UMFPACK (UF, GPL) solvers Modified OpenSees Services (MOSS) for managing the finite element domain (UCD, LGPL; UCB, GPL?) ndarray (UCD, LGPL), LTensor (CIMEC, GPL), BLAS (UTK, GPL) for lower level computational tasks, Message Passing Interface (MPI, openmpi, new BSD license)
11 NRC ESSI Simulator Computer NRC ESSI Simulator Computer Cluster of multiple performance processors interconnected with multiple performance networks Multiple generation processors and networks, modular, expandable, the most cost effective solution Secure access for the U.S.-NRC, located at UCD 15 current users (U.S.-NRC and UCD) Source compatibility with large supercomputers Design/components documentation will be posted at
12 NRC ESSI Simulator Notes NRC ESSI Simulator Notes A hypertext documentation system for modeling and simulations of NPP ESSI problems (Theory and Formulation, Software and Hardware, Verification and Validation, and Case Studies and Practical Examples) NRC-ESSI-Program code API (Application Programming Interface). NRC-ESSI-Program DSL (Domain Specific Language) Documentation for verification and validation examples Practical NPP ESSI examples and case studies Will be available to general public through
13 NRC ESSI Simulator Notes NRC ESSI Simulator Education U.S.-NRC staff capacity building, seminars, short courses, consultations, advising, NRC ESSI Program Verification and Validation NRC ESSI Model Development and Verification NRC ESSI Simulator short courses, seminars in preparation for outside users
14 Outline Introduction NRC ESSI Simulator System NRC ESSI Simulator Program NRC ESSI Simulator Computer NRC ESSI Simulator Notes Verification and Validation V&V Intro Model/Mesh Verification Summary
15 V&V Intro Verification, Validation, Prediction Verification: provides evidence that the model is solved correctly. Mathematics issue. Validation: provides evidence that the correct model is solved. Physics issue. V&V increases confidence in numerical prediction V&V increases confidence in decision making
16 V&V Intro Role of Verification and Validation (Oden et al.)
17 Model/Mesh Verification Mesh Size Effects on Wave Propagation Modeling Insufficient finite element size "filters out" high frequencies Rule of thumb: elements per wave length Models, 1000m, V s = 1000m/s and V s = 100m/s, element sizes h = 10, 20, 50m With and without physical and/or numerical damping, Ormsby wavelet Displacement (m) Time [s]
18 Model/Mesh Verification Base and Surface Dynamic Motions Input Motion Element Size: 10m Element Size: 20m Element Size: 50m FFT Amplitude e-05 6e-05 4e-05 2e Frequency [Hz]
19 Model/Mesh Verification Dynamic Motions for 10 Softer Soil 3.5e-05 3e-05 Input Motion Element Size: 10m Element Size: 20m Element Size: 50m 2.5e-05 FFT Amplitude 2e e-05 1e-05 5e Frequency [Hz]
20 Model/Mesh Verification Dynamic Motions 10, Softer, + Num. Damping 3e e-05 Input Motion Element Size: 10m Element Size: 20m Element Size: 50m FFT Amplitude 2e e-05 1e-05 5e Frequency [Hz]
21 Outline Introduction NRC ESSI Simulator System NRC ESSI Simulator Program NRC ESSI Simulator Computer NRC ESSI Simulator Notes Verification and Validation V&V Intro Model/Mesh Verification Summary
22 Summary High fidelity, time domain, nonlinear, earthquake soil structure interaction (ESSI) modeling and simulations System (Program, Computer, Notes) Educational component (U.S.-NRC, UCD, others), seminars, short courses Information Portal: Funding by and Collaboration with the U.S.-NRC is gratefully acknowledged
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