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Title: Large Eddy Simulation of the Flow Behavior in a Simplified Helical Coil Steam Generator

Abstract

Large eddy simulation (LES) is conducted for the flow over the shell side of a helical coil steam generator (HCSG) heat exchanger. Simulations are conducted on a simplified experimental test section that represents a one-column region of the helical coils using half-rods. Although the rods are wall-bounded, the flow still exhibits the turbulent characteristics and fluctuations from vortex shedding that one would expect from crossflow around a cylinder. The spectral element, computational fluid dynamics (CFD) code Nek5000, is used to capture the physics, and the results are compared with particle image velocimetry (PIV) measurements. In order to ensure that the turbulence is resolved, analysis is conducted by using the Taylor length scales and normalized wall distance. Sensitivity to the inlet boundary conditions (BCs) and the spatial discretization for different polynomial order solutions are also studied, finding only minor differences between each case. Pressure drop and velocity statistics show reasonable agreement with PIV. Proper orthogonal decomposition (POD) analysis reveals that the primary modes are similar between experiment and simulation, although the LES predicts higher turbulent kinetic energy than does PIV. Overall, the study establishes the resolution and resources required in order to conduct a high-fidelity simulation over 12 helical rods.

Authors:
; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy - Nuclear Energy Advanced Modeling and Simulation (NEAMS)
OSTI Identifier:
1510022
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Journal of Fluids Engineering
Additional Journal Information:
Journal Volume: 141; Journal Issue: 2
Country of Publication:
United States
Language:
English

Citation Formats

Lai, Jonathan K., Merzari, Elia, and Hassan, Yassin A. Large Eddy Simulation of the Flow Behavior in a Simplified Helical Coil Steam Generator. United States: N. p., 2019. Web. doi:10.1115/1.4040464.
Lai, Jonathan K., Merzari, Elia, & Hassan, Yassin A. Large Eddy Simulation of the Flow Behavior in a Simplified Helical Coil Steam Generator. United States. doi:10.1115/1.4040464.
Lai, Jonathan K., Merzari, Elia, and Hassan, Yassin A. Fri . "Large Eddy Simulation of the Flow Behavior in a Simplified Helical Coil Steam Generator". United States. doi:10.1115/1.4040464.
@article{osti_1510022,
title = {Large Eddy Simulation of the Flow Behavior in a Simplified Helical Coil Steam Generator},
author = {Lai, Jonathan K. and Merzari, Elia and Hassan, Yassin A.},
abstractNote = {Large eddy simulation (LES) is conducted for the flow over the shell side of a helical coil steam generator (HCSG) heat exchanger. Simulations are conducted on a simplified experimental test section that represents a one-column region of the helical coils using half-rods. Although the rods are wall-bounded, the flow still exhibits the turbulent characteristics and fluctuations from vortex shedding that one would expect from crossflow around a cylinder. The spectral element, computational fluid dynamics (CFD) code Nek5000, is used to capture the physics, and the results are compared with particle image velocimetry (PIV) measurements. In order to ensure that the turbulence is resolved, analysis is conducted by using the Taylor length scales and normalized wall distance. Sensitivity to the inlet boundary conditions (BCs) and the spatial discretization for different polynomial order solutions are also studied, finding only minor differences between each case. Pressure drop and velocity statistics show reasonable agreement with PIV. Proper orthogonal decomposition (POD) analysis reveals that the primary modes are similar between experiment and simulation, although the LES predicts higher turbulent kinetic energy than does PIV. Overall, the study establishes the resolution and resources required in order to conduct a high-fidelity simulation over 12 helical rods.},
doi = {10.1115/1.4040464},
journal = {Journal of Fluids Engineering},
number = 2,
volume = 141,
place = {United States},
year = {2019},
month = {2}
}

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