High <i>y</i><sup>+</sup> Shear-Stress Turbulence Implementation for High Flux Isotope Reactor Narrow Channel Flows
The research objective of this work was to improve the engineering predictions of the turbulence characteristics of flows in curved narrow channels. Such channel flows are commonly encountered in nuclear research and test reactors, with one of them being the high-flux isotope reactor (HFIR). Researc...
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MDPI AG
2025-03-01
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| author | Emilian Popov Nicholas Mecham Taylor Grubbs |
| author_facet | Emilian Popov Nicholas Mecham Taylor Grubbs |
| author_sort | Emilian Popov |
| collection | DOAJ |
| description | The research objective of this work was to improve the engineering predictions of the turbulence characteristics of flows in curved narrow channels. Such channel flows are commonly encountered in nuclear research and test reactors, with one of them being the high-flux isotope reactor (HFIR). Research reactors bear high heat fluxes, and the proper computing of turbulence is paramount for safe and reliable reactor operation. The study builds on the results of a previous direct numerical simulation of turbulence to inform a well-known Reynolds-averaged Navier–Stokes shear-stress turbulence model and improves its accuracy in simulating parallel channel flows. A new formulation of the loss term in the dissipation conservation equation is suggested. Combined with high wall distance computational grids, the new implementation provides a fast-running flow solution, suitable for engineering purposes. Model generalization for parallel channel flows, in a broader range of frictional Reynolds numbers, is suggested by introducing a new form of the model constants. |
| format | Article |
| id | doaj-art-ff72f7bbf5f3459c8dc70b8e154669af |
| institution | OA Journals |
| issn | 2311-5521 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Fluids |
| spelling | doaj-art-ff72f7bbf5f3459c8dc70b8e154669af2025-08-20T02:28:36ZengMDPI AGFluids2311-55212025-03-011048510.3390/fluids10040085High <i>y</i><sup>+</sup> Shear-Stress Turbulence Implementation for High Flux Isotope Reactor Narrow Channel FlowsEmilian Popov0Nicholas Mecham1Taylor Grubbs2Oak Ridge National Laboratory (ORNL), Oak Ridge, TN 37830, USADepartment of Nuclear Engineering, North Carolina State University (NCSU), Raleigh, NC 27695, USADepartment of Nuclear Engineering, North Carolina State University (NCSU), Raleigh, NC 27695, USAThe research objective of this work was to improve the engineering predictions of the turbulence characteristics of flows in curved narrow channels. Such channel flows are commonly encountered in nuclear research and test reactors, with one of them being the high-flux isotope reactor (HFIR). Research reactors bear high heat fluxes, and the proper computing of turbulence is paramount for safe and reliable reactor operation. The study builds on the results of a previous direct numerical simulation of turbulence to inform a well-known Reynolds-averaged Navier–Stokes shear-stress turbulence model and improves its accuracy in simulating parallel channel flows. A new formulation of the loss term in the dissipation conservation equation is suggested. Combined with high wall distance computational grids, the new implementation provides a fast-running flow solution, suitable for engineering purposes. Model generalization for parallel channel flows, in a broader range of frictional Reynolds numbers, is suggested by introducing a new form of the model constants.https://www.mdpi.com/2311-5521/10/4/85CFDRANSchannel flowSST |
| spellingShingle | Emilian Popov Nicholas Mecham Taylor Grubbs High <i>y</i><sup>+</sup> Shear-Stress Turbulence Implementation for High Flux Isotope Reactor Narrow Channel Flows Fluids CFD RANS channel flow SST |
| title | High <i>y</i><sup>+</sup> Shear-Stress Turbulence Implementation for High Flux Isotope Reactor Narrow Channel Flows |
| title_full | High <i>y</i><sup>+</sup> Shear-Stress Turbulence Implementation for High Flux Isotope Reactor Narrow Channel Flows |
| title_fullStr | High <i>y</i><sup>+</sup> Shear-Stress Turbulence Implementation for High Flux Isotope Reactor Narrow Channel Flows |
| title_full_unstemmed | High <i>y</i><sup>+</sup> Shear-Stress Turbulence Implementation for High Flux Isotope Reactor Narrow Channel Flows |
| title_short | High <i>y</i><sup>+</sup> Shear-Stress Turbulence Implementation for High Flux Isotope Reactor Narrow Channel Flows |
| title_sort | high i y i sup sup shear stress turbulence implementation for high flux isotope reactor narrow channel flows |
| topic | CFD RANS channel flow SST |
| url | https://www.mdpi.com/2311-5521/10/4/85 |
| work_keys_str_mv | AT emilianpopov highiyisupsupshearstressturbulenceimplementationforhighfluxisotopereactornarrowchannelflows AT nicholasmecham highiyisupsupshearstressturbulenceimplementationforhighfluxisotopereactornarrowchannelflows AT taylorgrubbs highiyisupsupshearstressturbulenceimplementationforhighfluxisotopereactornarrowchannelflows |