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Methodology Development for High-to-...

Kulkarni, Nilay Atul,

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Methodology Development for High-to-Low Information of Subchannel Code CTF with CFD Code Nek5000 /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Methodology Development for High-to-Low Information of Subchannel Code CTF with CFD Code Nek5000 // Nilay Atul Kulkarni.
作者:	Kulkarni, Nilay Atul,
面頁冊數:	1 electronic resource (69 pages)
附註:	Source: Masters Abstracts International, Volume: 84-12.
Contained By:	Masters Abstracts International84-12.
標題:	Friction. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30463951
ISBN:	9798379659264

Methodology Development for High-to-Low Information of Subchannel Code CTF with CFD Code Nek5000 /
Kulkarni, Nilay Atul,

Methodology Development for High-to-Low Information of Subchannel Code CTF with CFD Code Nek5000 /Nilay Atul Kulkarni. - 1 electronic resource (69 pages)

Source: Masters Abstracts International, Volume: 84-12.

Precise thermal hydraulic analysis of reactor core is essential for safety and power analysis of a nuclear reactor. Complete reactor core calculations can be carried out using subchannel codes, but these codes often lack the resolution and fidelity to capture physical phenomenon occurring at smaller scales. Computational Fluid Dynamics (CFD) on the other hand can capture these phenomena but it is computationally expensive.The High-To-Low (Hi2Lo) model fidelity information seeks to bridge this gap by using data extracted from high-fidelity modeling and simulation (M&S) tools such as CFD codes and applying it as informing parameters to improve macroscopic physical phenomenon M&S in CTF. In this study, a methodology is developed to inform the subchannel code CTF with the spectral element code Nek5000. Subchannels are modeled with various spacer grids addressed in the PSBT benchmark and turbulent simulation are carried out using Large Eddy Simulation (LES) turbulence modelling. With these simulations the grid loss coefficient and the custom friction factor are calibrated to be informed to account for form and friction pressure loss in CTF. Friction factor calibration is carried out using friction velocity data obtained from different levels of mesh refinement over a range of flowrates and different levels of mesh refinement. With the friction factor calibration, an attempt is made to demonstrate the propagation of mesh-based uncertainty from high-fidelity Nek5000 to lower fidelity CTF.The presence of spacer grids not only causes form pressure loss but also causes augmentation in the turbulence locally which causes mixing between adjacent subchannels and affects the heat transfer from the fuel rods surface to the coolant. In this study, a center-center subchannel configuration with the simplified spacer grids is modeled to extract Hi2Lo data for a single-phase turbulent mixing multiplier and to calculate the enhanced heat transfer coefficient.

English

ISBN: 9798379659264Subjects--Topical Terms:

650299
Friction.

Methodology Development for High-to-Low Information of Subchannel Code CTF with CFD Code Nek5000 /
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