The six-equation two-fluid model of two-phase flow taken from the RELAP5/MOD3 computer code has been used to simulate three simple transients: a two-phase shock tube problem, the Edwards Pipe experiment, and water hammer due to rapid valve closure. These transients can be characterized as fast transients, since their characteristic time-scales are determined by the sonic velocity. First and second-order accurate numerical methods have been applied both based on the well-known, Godunov-type numerical schemes. Regarding the uncertainty of the two-fluid models in today’s large computer codes for the nuclear thermal-hydraulics, use of second-order schemes is not always justified. While this paper shows the obvious advantage of second-order schemes in the area of fast transients, first-order accurate schemes may still be sufficient for a wide range of two-phase flow transients where the convection terms play a minor role compared to the source terms.
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June 1998
Research Papers
First and Second-Order Accurate Schemes for Two-Fluid Models
Iztok Tiselj,
Iztok Tiselj
“Jozˇef Stefan” Institute, Jamova 39, 1111 Ljubljana, Slovenia
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Stojan Petelin
Stojan Petelin
“Jozˇef Stefan” Institute, Jamova 39, 1111 Ljubljana, Slovenia
Search for other works by this author on:
Iztok Tiselj
“Jozˇef Stefan” Institute, Jamova 39, 1111 Ljubljana, Slovenia
Stojan Petelin
“Jozˇef Stefan” Institute, Jamova 39, 1111 Ljubljana, Slovenia
J. Fluids Eng. Jun 1998, 120(2): 363-368 (6 pages)
Published Online: June 1, 1998
Article history
Received:
February 14, 1997
Revised:
December 5, 1997
Online:
December 4, 2007
Citation
Tiselj, I., and Petelin, S. (June 1, 1998). "First and Second-Order Accurate Schemes for Two-Fluid Models." ASME. J. Fluids Eng. June 1998; 120(2): 363–368. https://doi.org/10.1115/1.2820656
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