COMSOL-Related Activities within the Research Reactors Division of. Oak Ridge National Laboratory
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1 COMSOL-Related Activities within the Research Reactors Division of Oak Ridge National Laboratory presented by: James D. Freels Oak Ridge National Laboratory Nuclear Science and Engineering Directorate Research Reactor Division High Flux Isotope Reactor Nuclear Safety Group presented to: COMSOL Conference 2015 Boston Session: Multiphysics Modeling for Reactor Engineering ORNL is managed by UT-Battelle for the US Department of Energy October 8, 2015
2 The full outline of the Companion Paper: Abstract Introduction Why We are Using COMSOL Some Success Stories Our Current Applications Anticipated Expansion of our Applications Best Practices Software, License, and Document Management Local COMSOL User Group Joint ORNL / COMSOL Symposia / Workshop Local Tips and Tricks Software Quality Assurance Suggestions and Conclusions Acknowledgements References the balance of this presentation will focus on the topics shown in red italics (boring, no pretty pictures) there are extra slides at the end of this presentation on the other topics in the paper (lots of pretty pictures) 2 COMSOL-Related Activities within the RRD of ORNL, COMSOL Conference 2015 Boston, J. D. Freels, 10/08/2015
3 My One-Sentence Description of COMSOL: COMSOL Multiphysics is a finite-element based computer simulation toolbox 3 COMSOL-Related Activities within the RRD of ORNL, COMSOL Conference 2015 Boston, J. D. Freels, 10/08/2015
4 COMSOL is our choice because (part 1 of 2): Finite-element methods are the most accurate numerical simulation tool available for deterministic solutions. COMSOL is nearly100%-true finite-element method code for all the physics simulated (some exceptions: ODE solver, Particle Tracing Module). COMSOL is the leader, and perhaps, the only true-multiphysics code commercially available (CFD, heat transfer, structural mechanics, PDE mode, etc. on our projects). 4 COMSOL-Related Activities within the RRD of ORNL, COMSOL Conference 2015 Boston, J. D. Freels, 10/08/2015
5 COMSOL is our choice because (part 2 of 2): If desired, the standard equations solved may be altered on INPUT by the USER (for example, constitutive equations including turbulence model). You can solve your own equations from scratch (PDE, ODE, algebraic, functions, etc.) COMSOL provides a convenient GUI in modern computing environments. COMSOL continues to provide technical support and code improvements at a remarkable pace (distributed parallel processing, new modules, interface tools, response to user requests, etc.) now at v5.1! Application builder now available with base package. 5 COMSOL-Related Activities within the RRD of ORNL, COMSOL Conference 2015 Boston, J. D. Freels, 10/08/2015
6 Best Practices: Software, License, and Document Management central server for all of these functions longer trial period recommended floating network license recommended combine resources to share licenses scripts to quickly update application library, parts library share libraries using samba network file system for improved sharing and parallel processing of workstations 6 COMSOL-Related Activities within the RRD of ORNL, COMSOL Conference 2015 Boston, J. D. Freels, 10/08/2015
7 Best Practices: Local COMSOL User Group several attempts at forming a viable user group core set of users form a combined user group and project application meeting (always get something done, and improve) we found that a user group improves efficiency, helps each other out, adds members to license pool, always learning something new 7 COMSOL-Related Activities within the RRD of ORNL, COMSOL Conference 2015 Boston, J. D. Freels, 10/08/2015
8 Best Practices: Joint ORNL / COMSOL Symposia / Workshop so far, we have done this about 3-4 times many potential users at ORNL goal: more users, larger license pool some effort required outside users find it difficult to visit ORNL showcase work, add new customers for analysts using COMSOL potentially do this on annual basis 8 COMSOL-Related Activities within the RRD of ORNL, COMSOL Conference 2015 Boston, J. D. Freels, 10/08/2015
9 Best Practices: Local Tips and Tricks a need exists outside COMSOL tech support to keep track of items unique to the local level easy to implement as a.pdf file file-name list on the COMSOL license server (also a web server to the LAN only) full paper lists several of the items on our local tips and tricks 9 COMSOL-Related Activities within the RRD of ORNL, COMSOL Conference 2015 Boston, J. D. Freels, 10/08/2015
10 Best Practices: Software Quality Assurance nuclear industry requires SQA, but it is good practice for all we separate verification and validation, and require both use the COMSOL application library to the extent possible for V&V a new validation plan is forthcoming for HFIRspecific needs continually look to improve hope to see more direct V&V support from the COMSOL developers 10 COMSOL-Related Activities within the RRD of ORNL, COMSOL Conference 2015 Boston, J. D. Freels, 10/08/2015
11 Suggestions and Conclusions no one person knows everything about COMSOL (lots to learn) keeping up and learning is a continuous process using COMSOL with other users helps the individual to get better with using the code through peer review and constructive criticism and debate Questions? 11 COMSOL-Related Activities within the RRD of ORNL, COMSOL Conference 2015 Boston, J. D. Freels, 10/08/2015
12 Extra Slides 12 COMSOL-Related Activities within the RRD of ORNL, COMSOL Conference 2015 Boston, J. D. Freels, 10/08/2015
13 Success Story: COMSOL on the HFIR Cold Source Project COMSOL Multiphysics was the design-basis tool for the cold source pressurizer; now over 50 HFIR fuel cycles operation 13 COMSOL-Related Activities within the RRD of ORNL, COMSOL Conference 2015 Boston, J. D. Freels, 10/08/2015
14 Success Story: COMSOL multiphysics simulation of the HFIR cold source pressurizer (part 1 of 2) 14 COMSOL-Related Activities within the RRD of ORNL, COMSOL Conference 2015 Boston, J. D. Freels, 10/08/2015
15 Success Story: COMSOL multiphysics simulation of the HFIR cold source pressurizer (part 2 of 2) 15 COMSOL-Related Activities within the RRD of ORNL, COMSOL Conference 2015 Boston, J. D. Freels, 10/08/2015
16 Next Success Story: COMSOL on the HFIR Pu-238 Project V4.2a SQA approved Preparer: James D. Freels Check/Review: Prashant K Jain Student Analyst in training: Christopher J Hurt PhD Student UTK-NE COMSOL is the designand safety-basis tool for the Pu-238 production project 16 COMSOL-Related Activities within the RRD of ORNL, COMSOL Conference 2015 Boston, J. D. Freels, 10/08/2015
17 Additional Target Designs have been COMSOL- Analyzed and Irradiated in the Past Year at HFIR (all temperature contours are shown 135 F 650 C) additional single bare pellets, also 2 nd irradiation cycle, COMSOL 4.2a, 3D, ¼ pie slice reduced-length bare pellets, 1 and 2 irradiation cycles, COMSOL 4.2a, 3D, ¼ pie slice partially-loaded (7 pellets) prototype production target, 1 and 2 irradiation cycles, COMSOL 4.3, 2D axisymmetric fully-loaded prototype production target (52 pellets), 1 irradiation cycle, COMSOL 4.3, 2D axisymmetric (cycle just started) individual pellet at maximum temperature in stack: (note: classic hourglass shape) 3-D Rotated Stress Contour with 10000x Deformation of the 2D Axisymmetric Modeled Volume of the Hot Pellet for the VXF-15 EOC-1 Safety-Basis Conditions at 130% Power. 17 COMSOL-Related Activities within the RRD of ORNL, COMSOL Conference 2015 Boston, J. D. Freels, 10/08/2015
18 The Conversion of HFIR to LEU Fuel will be another COMSOL Success Story Presently using safety-basis (SB) and best-estimate (BE) models to support the conversion activities. Several physics are incorporated and coupled to formulate multiple physics (see separate presentations): turbulent conjugate heat transfer (coolant, clad, fuel, side plates) temperature dependent properties (and pressure for water) structural mechanics thermal-structure interaction irradiation impacts on material properties (limited) fluid-structure interaction (isothermal separate effect only at the present time) Additional physics to be included: (1) fully-coupled FSI, (2) additional irradiation impacts including swelling, (3) multi-plate up to entire core, (4) reactor physics, (5) flow blockage, (6) severe accidents. 18 COMSOL-Related Activities within the RRD of ORNL, COMSOL Conference 2015 Boston, J. D. Freels, 10/08/2015
19 Additional Physics 1: Fluid-Structure Interaction Franklin Curtis validated separate-effects COMSOL models on data from several sources including ANS and HFIR. ANS test data shown below for aluminum plates up to 40 m/s coolant flow. 19 COMSOL-Related Activities within the RRD of ORNL, COMSOL Conference 2015 Boston, J. D. Freels, 10/08/2015
20 Additional Physics 2: Irradiation-induced swelling. Emilian Popov demonstrated through a proof of-principal method that COMSOL can be used to simulate irradiation swelling. Shown below is the Von Mises stress results for a prototypical 2D fuel plate undergoing isotropic (left) and orthotropic (right) swelling. 20 COMSOL-Related Activities within the RRD of ORNL, COMSOL Conference 2015 Boston, J. D. Freels, 10/08/2015
21 Additional Physics 3: Multi-Plate Simulations Prashant Jain and Vaibhav Khane demonstrated that the existing COMSOL single-plate models can be expanded to a multi-plate model. 21 COMSOL-Related Activities within the RRD of ORNL, COMSOL Conference 2015 Boston, J. D. Freels, 10/08/2015
22 Additional Physics 4a: Reactor Neutronics by Diffusion Theory David Chandler, as an integral part of his PhD dissertation used COMSOL PDE equationbased modeling to perform spatiallydependent reactor kinetics of HFIR. Power shifts to the OFE during control cylinder ejection and then back to IFE during safety plate insertion. 22 COMSOL-Related Activities within the RRD of ORNL, COMSOL Conference 2015 Boston, J. D. Freels, 10/08/2015
23 Additional Physics 4b: Reactor Neutronics by Discrete Ordinates Christopher J. Hurt is currently using COMSOL PDE equationbased modeling to simulate 2D axisymmetric power distribution of the HFIR core as research in support of his PhD dissertation. HFIR Fission Power (unnormalized and preliminary) 23 COMSOL-Related Activities within the RRD of ORNL, COMSOL Conference 2015 Boston, J. D. Freels, 10/08/2015
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