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Thermal Hydraulics
The division provides a forum for focused technical dialogue on thermal hydraulic technology in the nuclear industry. Specifically, this will include heat transfer and fluid mechanics involved in the utilization of nuclear energy. It is intended to attract the highest quality of theoretical and experimental work to ANS, including research on basic phenomena and application to nuclear system design.
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2024 ANS Annual Conference
June 16–19, 2024
Las Vegas, NV|Mandalay Bay Resort and Casino
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The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
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Argonne opens registration for D&D training course
Registration is open for Argonne National Laboratory’s Facility Decommissioning Training Course, a four-day instruction designed for those responsible for the decontamination and decommissioning of nuclear facilities and who are looking to understand the full breadth and depth of the D&D processes.
The next session will be held July 16–19 in Santa Fe, N.M. Information on the course and how to register can be found here.
Gabriele Grassi
Nuclear Science and Engineering | Volume 155 | Number 2 | February 2007 | Pages 208-222
Technical Paper | Mathematics and Computation, Supercomputing, Reactor Physics and Nuclear and Biological Applications | doi.org/10.13182/NSE07-A2657
Articles are hosted by Taylor and Francis Online.
A new space-angle multigrid technique has been developed to accelerate the free inner transport iterations based upon the method of characteristics (MOC). We present a two-level scheme that consists of a fine level on which the MOC transport calculation is performed and a more coarsely discretized phase-space in which a low-order problem is solved as an acceleration step. A flux-volume homogenization technique is employed to define the coarse-level cross sections. This entails the nonlinearity of the scheme. Restriction and prolongation operators are defined between the two levels. After each fine transport iteration, a low-order transport problem is iteratively solved on the homogenized grid. A coarser angular representation is used within an MOC-like framework. Discontinuity factors are employed to reconstruct the scalar incoming and outgoing currents on each region of the coarse discretization. The solution of the aforementioned low-order problem is used to correct the angular moments of the flux resulting from the previous free transport sweep. A complete description of the low-order operator and of the grid-to-grid transfer operators is given. A further application of the method to the acceleration of outer transport iterations is also presented. In order to test the effectiveness of this method, numerical tests for given benchmark geometries have been performed. Results are discussed.