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Conference Spotlight
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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Hash Hashemian: Visionary leadership
As Dr. Hashem M. “Hash” Hashemian prepares to step into his term as President of the American Nuclear Society, he is clear that he wants to make the most of this unique moment.
A groundswell in public approval of nuclear is finding a home in growing governmental support that is backed by a tailwind of technological innovation. “Now is a good time to be in nuclear,” Hashemian said, as he explained the criticality of this moment and what he hoped to accomplish as president.
Emilio Baglietto, Hisashi Ninokata
Nuclear Technology | Volume 158 | Number 2 | May 2007 | Pages 237-248
Technical Paper | Nuclear Reactor Thermal Hydraulics | doi.org/10.13182/NT07-A3839
Articles are hosted by Taylor and Francis Online.
An improved quadratic nonlinear eddy viscosity model (NLEVM) is introduced that respects the constraints of realizability for calculation of detailed coolant velocity and temperature distributions inside tight lattice fuel bundles. The model adopts an optimized low-Reynolds formulation based on direct numerical simulation data, combined with an enhanced nonlinear stress-strain relationship to correctly capture the anisotropy of the flow up to the solid wall. The capabilities of the model are first assessed on the prediction of fully developed flow inside triangular lattice bundles; it is shown how the ability to correctly reproduce the turbulent-driven secondary flow enables the model to accurately reproduce wall shear stress and velocity distributions inside the bundle. The model is applied to the evaluation of the thermal-hydraulic performances of novel fuel designs, discussing potential advantages and limitations of the newly proposed solutions.