Implementation of the LAX-Wendroff Method in Cobra-TF for Solving Two-Phase Flow Transport Equations

Conference · Fri Jan 01 00:00:00 EST 2016

OSTI ID:1266850

Salko, Robert K ^[1]; Wang, Dean ^[1]; Ren, Kangyu ^[2]

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1. ORNL
2. University of Massachusetts, Lowell

COBRA-TF (Coolant Boiling in Rod Arrays Two Fluid), or CTF, is a subchannel code used to conduct the reactor core thermal hydraulic (T/H) solution in both standalone and coupled multi-physics applications. CTF applies the first-order upwind spatial discretization scheme for solving two-phase flow conservation equations. In this work, the second-order Lax-Wendroff (L-W) scheme has been implemented in CTF to solve the two-phase flow transport equations to improve numerical accuracy in both temporal and spatial discretization. To avoid the oscillation issue, a non-linear flux limiter VA (Van Albada) is employed for the convective terms in the transport equations. Assessments have been carried out to evaluate the performance and stability of the implemented second-order L-W scheme. It has been found that the L-W scheme performs better than the upwind scheme for the single-phase and two-phase flow problems in terms of numerical accuracy and computational efficiency.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1266850
• Resource Relation: Conference: 2016 International Congress on Advances in Nuclear Power Plants, San Francisco, CA, USA, 20160417, 20160420
• Country of Publication: United States
• Language: English

Related Subjects

CTF
VERA-CS
subchannel