@Article{CiCP-19-1529,
author = {Goutam Dutta, Jin Jiang, Rohit Maitri and Chao Zhang},
title = {A Numerical Thermal-Hydraulic Model to Simulate the Fast Transients in a Supercritical Water Channel Subjected to Sharp Pressure Variations},
journal = {Communications in Computational Physics},
year = {2018},
volume = {19},
number = {5},
pages = {1529--1541},
abstract = {<p style="text-align: justify;">The present work demonstrates the extension of a thermal-hydraulic model,
THRUST, with an objective to simulate the fast transient flow dynamics in a supercritical
water channel of circular cross section. THRUST is a 1-D model which solves
the nonlinearly coupled mass, axial momentum and energy conservation equations
in time domain based on a characteristics-dependent fully implicit finite difference
scheme using an Eulerian approach. The model developed accounts for the compressibility
of the supercritical flow by considering the finite value of acoustic speed in the
solution algorithm and treats the boundary conditions naturally. A supercritical water
channel of circular cross section, for which the experimental data is available at steady
state operating conditions, is chosen for the transient simulations to start with. Two
different case studies are undertaken with a purpose to assess the capability of the
model to analyze the fast transient processes caused by the large reduction in system
pressure. The first transient case study is where the initial exit pressure is reduced by
1 MPa exponentially in a time span of 5 s. In the second case study, the transient is
initiated with a sudden step decrease in the exit pressure by the same amount. Results
obtained for both the case studies show the desired performance from the model
developed.</p>},
issn = {1991-7120},
doi = {https://doi.org/10.4208/cicp.scpde14.42s},
url = {http://global-sci.org/intro/article_detail/cicp/11141.html}
}