Modeling moving systems with RELAP53D
RELAP53D is typically used to model stationary, landbased reactors. However, it can also model reactors in other inertial and accelerating frames of reference. By changing the magnitude of the gravitational vector through user input, RELAP53D can model reactors on a space station or the moon. The field equations have also been modified to model reactors in a noninertial frame, such as occur in landbased reactors during earthquakes or onboard spacecraft. Transient body forces affect fluid flow in thermalfluid machinery aboard accelerating crafts during rotational and translational accelerations. It is useful to express the equations of fluid motion in the accelerating frame of reference attached to the moving craft. However, careful treatment of the rotational and translational kinematics is required to accurately capture the physics of the fluid motion. Correlations for flow at angles between horizontal and vertical are generated via interpolation where no experimental studies or data exist. The equations for threedimensional fluid motion in a noninertial frame of reference are developed. As a result, two different systems for describing rotational motion are presented, user input is discussed, and an example is given.
 Authors:

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 Idaho National Lab. (INL), Idaho Falls, ID (United States)
 Bettis Atomic Power Lab., West Mifflin, PA (United States)
 Publication Date:
 Report Number(s):
 INL/JOU1433497
Journal ID: ISSN 00295639
 Grant/Contract Number:
 AC0705ID14517
 Type:
 Accepted Manuscript
 Journal Name:
 Nuclear Science and Engineering
 Additional Journal Information:
 Journal Volume: 182; Journal Issue: 1; Journal ID: ISSN 00295639
 Publisher:
 American Nuclear Society
 Research Org:
 Idaho National Lab. (INL), Idaho Falls, ID (United States)
 Sponsoring Org:
 USDOE
 Country of Publication:
 United States
 Language:
 English
 Subject:
 22 GENERAL STUDIES OF NUCLEAR REACTORS; 97 MATHEMATICS AND COMPUTING; RELAP53D; noninertial frame; Euler angles
 OSTI Identifier:
 1255246
Mesina, G. L., Aumiller, David L., Buschman, Francis X., and Kyle, Matt R.. Modeling moving systems with RELAP53D. United States: N. p.,
Web. doi:10.13182/NSE153.
Mesina, G. L., Aumiller, David L., Buschman, Francis X., & Kyle, Matt R.. Modeling moving systems with RELAP53D. United States. doi:10.13182/NSE153.
Mesina, G. L., Aumiller, David L., Buschman, Francis X., and Kyle, Matt R.. 2015.
"Modeling moving systems with RELAP53D". United States.
doi:10.13182/NSE153. https://www.osti.gov/servlets/purl/1255246.
@article{osti_1255246,
title = {Modeling moving systems with RELAP53D},
author = {Mesina, G. L. and Aumiller, David L. and Buschman, Francis X. and Kyle, Matt R.},
abstractNote = {RELAP53D is typically used to model stationary, landbased reactors. However, it can also model reactors in other inertial and accelerating frames of reference. By changing the magnitude of the gravitational vector through user input, RELAP53D can model reactors on a space station or the moon. The field equations have also been modified to model reactors in a noninertial frame, such as occur in landbased reactors during earthquakes or onboard spacecraft. Transient body forces affect fluid flow in thermalfluid machinery aboard accelerating crafts during rotational and translational accelerations. It is useful to express the equations of fluid motion in the accelerating frame of reference attached to the moving craft. However, careful treatment of the rotational and translational kinematics is required to accurately capture the physics of the fluid motion. Correlations for flow at angles between horizontal and vertical are generated via interpolation where no experimental studies or data exist. The equations for threedimensional fluid motion in a noninertial frame of reference are developed. As a result, two different systems for describing rotational motion are presented, user input is discussed, and an example is given.},
doi = {10.13182/NSE153},
journal = {Nuclear Science and Engineering},
number = 1,
volume = 182,
place = {United States},
year = {2015},
month = {12}
}