Hello, A change in allocation has been requested: Requester: fischer (Paul Fischer) Project: Nek5000 Title: Scalable CFD Algorithms 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 interacations 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 demonstrated > 80% parallel efficiency on BG/P (strong scaling) out to P=131,072 processors, using only 7300 points/processor at the largest scale. Nek5000 was recognized with a Gordon Bell award in 1999 for scalability and algorithmic quality. Some of the science applications we anticipate addressing in the coming year are: boundary-layer MHD, non-hydrostatic modeling of ocean currents, and film cooling for gas turbine blades. This latter problem is likely to require 50-100K core-hours. Most of the simulations, however, will be performed by the Texas A&M group leading the project with their own compute resources. This is our standard model -- get the problem running, and then turn it over to the research group in charge. In the past, this model has led to very successful collaborations in oceanography ( > 12 publications), spatiotemporal chaos ( > 12 publications), and MHD ( 4 publications and two INCITE awards). We note that we have access to a dedicated 128-core linux cluster (under a nuclear engineering project) and to resource on BG/P through INCITE and discretionay allocations. This request is to address mid-range capabilities -- particularly for those applications that would not fit on the 128-core cluster. Current: undetermined amount Justification: Requested: 350000 A specific reason has been given: Nek5000 is the principal software engine for several projects within MCS, including Petascale Algorithms for Transport Simulation, supported by the DOE Applied Mathematics Program; Advanced Thermal Hydraulics Modeling, funded under the Nuclear Engineear Advanced Modeling and Simulation (NEAMS) program, and others. Access to a midsize machine like Fusion is of significant value in that it allows us to run cases that are too small for (say) BG/P allocations and too larger for local platforms. In addition, it gives us an important test/development platform for support of users around the world who have similar platforms. This needs to be approved and the final allocation amount decided upon. Thank You, The LCRC Accounts System