Hello, A yearly allocation for the LCRC cluster has been requested with the following updated information: Submitter/PI: Aleksandr Obabko Project Name: Nek5000 Division: MCS Project title: Scalable CFD Algorithms Associated funding: Applied Math Research Program, Nuclear Energy Advanced Modeling and Simulation Other Systems: ALCF Intrepid (BG/P), 128-core Linux cluster, Cosmea Science: Our mission is to develop and deploy scalable algorithms for simulation-based science applications that rely on numerical solution of partial differential equations. Our primary vehicle for algorithm development is the fluid/thermal simulation code, Nek5000, and its off-shoots, NekCEM (for computational electromagnetics) and NekLBM (for lattice Boltzmann methods). There are approximately 30 research groups worldwide currently using Nek5000. We use Nek5000---and the science applications brought to us through our user community---as vehicles for the development and test of new numerical algorithms that include stabilized high-order methods, scalable linear solvers, advanced timestepping methods, and so forth. We emphasize that these algorithms cannot be developed in isolation from applications, as many of the relevant issues do not arise at small scale or in simple model problems devoid of complex physics and/or geometry. Thus, to address algorithmic issues at the forefront of science-based simulation we require a code that is capable of solving problems _at_scale_ and that is sufficiently flexible to allow adaptation to new physics. Project description: Nek5000 is a petascale fluid/thermal simulation code used for a host of applications including reactor thermal hydraulics, combustion, MHD, oceanography, spatiotemporal chaos, and vascular flow modeling. Nek5000 is a grid-based PDE (partial differential equation) solver in three space dimensions and time. The code has long been at the forefront of high-order methods and scalable algorithms. It was one of the first comprehensive software tools developed for distributed memory parallel platforms. It pioneered the development of high-order discretizations that, because of their ability to accurately capture interactions over a broad range of scales, are now deemed an essential ingredient of petascale simulation science and that are being adapted across virtually all disciplines (e.g., fusion, aeronautics, biofluids and geophysics). We have access to resources on BG/Q through INCITE and discretionary allocations. This request is to address mid-range capabilities. Our goal is to use Blues to test the performance of mid-size problems (with 10,000 to 100000) elements with various compilers and compiler options. We also intend to set up a suite of large problems to ensure that various builds are working correctly. We also intend to run production cases for problems in nuclear engineering such as boiling heat transfer (multiphase flows), thermal stripping and conjugate heat-transfer. This year we plan to continue to test various large-element cases which have been run with LES models using 3 different uRANS models that have been implemented in Nek5000. These runs typically need about 100-150K core-hours per case. We aim to study 4-6 such cases with the allocation this year. Industry partnership: None Project URL: http://www.mcs.anl.gov/~fischer/sem1b Current FY Hours Used: undetermined amount New FY Requested allocation: 475000 Q1: 100000 Q2: 125000 Q3: 125000 Q4: 125000 Justification: Storage requirements: Thank You, The LCRC Accounts System