Hello, A new project on the LCRC cluster has been requested. Please forward the information on to the LCRC Allocation sub-committee. Applicant's name: Elia Merzari Applicant's institution: ANL Applicant's division: NE Project Name: SHARP_TH Project title: SHARP Thermal-Hydraulics Development Associated funding: DOE-Nuclear Energy Other Systems: Science: To validate, develop and extend the thermal-hydraulics capabilities of the multi-physics nuclear reactor analysis platform package SHARP. This project comprises several activities in the SHARP thermal-hydraulics development and validation efforts in support of the Nuclear Energy Advanced Modeling and Simulation (NEAMS) program under DOE-NE: Item 1) The commercial CFD code STAR-CCM+ and the DOE nuclear fuel performance code AMP will be coupled within the SHARP framework for multi-physics analysis of Light Water Reactors (LWRs). In the planned activities for FY12, two calculations will be performed in parallel with AMP and STAR-CCM+, comprising an LWR fuel assembly. The purpose of this item of this item is to demonstrate feasibility of such find of coupling, which is an emerging field in nuclear reactor analysis.. Item 2) Using the commercial CFD code STAR-CCM+ we plan to address the international NEA blind benchmark set forth for April 2012. The object of the benchmark is the MATiS experiment, consisting of fine-detaileda PIV measurements of the flow in a 5x5 rod bundle in the wake of a grid spacer. The objective is to validate CFD practices for this type of flow, which is practically encountered in fuel assemblies in nuclear power reactors. Given the complex geometry and highly turbulent flow, this exercise presents a highly challenging problem in terms of both the computational expense and the physics involved. Item 3) Using the commercial CFD code STAR-CCM+ we plan to study in further detail the Argonne MAX experiment. In previous years, preliminary calculations for the MAX experiment were performed. Now that funding has been secured for the finalization of the experimental activities we plan to finalize such calculations and support the experimental work. In addition this work would be instrumental in validating CFD practices for the flow configurations examined. Project description: Item 1, (STAR-CCM+, AMP coupling) STAR-CCM+ employs the finite volume formulation of the Reynolds-Averaged Navier-Stokes (RANS) method to determine the local three-dimensional velocity distribution in each sub-channel. Simultaneously, it is capable to solve the conjugate heat transfer problem to determine the temperature distribution within the fuel. This temperature data is provided to AMP to evaluate fuel performance. Initially the AMP code will be run separately and the code will be coupled off-line. Future developments will include on-line coupling using the MOAB framework. Item 2, (MATiS experiment) Several RANS simulations of the flow in the MATiS experiment rod bundle with mixing vanes (split vane and swirl type) will be performed and compared with LES simulation performed on BG/P. The optimal turbulence model and computational practices will be determined. The results will be used to participate in the international NEA benchmark. Item 3, (MAX experiment support) Using insight from previous work steady state and full transient URANS calculations will be performed. Results will be compared with available experimental data and used to determine and guide the experimental matrix. Access to the Fusion cluster would be crucial in performing all the proposed work. The STAR-CCDM+ code has already been installed on Fusion. Compilers, such as the Intel Fortran Compiler necessary to compile users subroutines are already installed. All jobs run on Fusion will be run in parallel. All calculations proposed require large computational resources due to the size of the problem. Four to ten users are expected for this project. Project URL: Requested allocation: 900000 Q1: 100000 Q2: 400000 Q3: 150000 Q4: 250000 Justification: At Argonne and elsewhere, the CFD codes STAR-CCM+ is routinely applied to simulations that use up to thousands of cores, and good parallel performance has been observed. Optimal performance is usually observed in steady state analysis is observed usually with 50,000 - 100,000 meshes per core. The typical size of the problems proposed are the following: Item 1) STAR-CCM+ - AMP coupling: 20,000,000 meshes. This would require typically 256 cores to be performed. Considering that a problem would likely converge within 48h of continouscontinuous calculation and that we would like to perform at least 20 production runs with 3,000 h of development this would translate in approximately 250,000 core-hours. Item 2) MATiS experiment simulation: 50,000,000-100,000,000 meshes. This would require typically 512-1024 cores to be performed. Considering that a problem would likely converge within 48h of continouscontinuous calculation and that we would like to perform at least 15 production runs with 3,000 h of development this would translate in approximately 400,000 core-hours. Item 3) MAX simulation: 5,000,000 meshes. This would require typically 64 cores to be performed. Long transient are likely to be necessary with 200h of consecutive calculations. Considering that we would like to perform at least 20 production transient runs, with 3,000 h of development this would translate in approximately 250,000 core-hours. The requester has used undetermined amount hours of their initial startup project. In addition to approving an initial amount, please specify a Category and Subcategory for this project. For a list of the current selection of approved categories, please see: https://wiki.lcrc.anl.gov/wiki/Processes/Categories Once the Allocation committee has approved the project, please go to the Project Management page to create it: https://accounts.lcrc.anl.gov/projects.php Thank You, The LCRC Accounts System