CTF User's Manual

Abstract

The initial mass flow rate is set to 0.0 by default. Therefore, a time-dependent ramp for the inlet mass flow rate should be applied (see description in CARD GROUP 13). Note 2: Variables PREF and HIN are used to determine the initial properties of the fluid in computational domain. Note 3: Because the mass conservation equation for non-condensable gases is not actively solved in this version of CTF, the volume fraction of vapor in the vapor-gas mixture should not be less than 0.9999! Note 4: Variables BRIN and RDIF are only read if the boron tracking/precipitation model is activated (IBTM = 0). RDIF is only used when IBTM = 2. May 26, 2016 Reactor Dynamics and Fuel Management Group www.mne.psu.edu/rdfmg pg. 14 of 178 0-Constant mesh cell length (default) >0-Read IVARDX pairs in variable ∆X table (see Card 4.3) Integer Required Card 4.3 is only read if IVARDX >0. Up to 5 sets of (JLEV, VARDX) may be entered. If IVARDX is greater than 5, repeat CARD 4.3 until IVARDX pairs has been entered. If IVARDX is less than 5 enter (0; 0.0) until 5 sets of (JLEV, VARDX) have been entered.

High-Fidelity Multi-Physics Pin-by-Pin Model of a Svea-96 Optima2 Assembly With Tort-Td/CTF

“…In this code system, the thermal hydraulics is simulated by CTF, which is an advanced thermal-hydraulics sub-channel code. Originating from COBRA-TF (Coolant Boiling in Rod Arrays -Two Fluid), it is being developed and improved at the North Carolina State University (NCSU) in cooperation with the Oak Ridge National Laboratory (ORNL) and rebranded as CTF [2]. It is a part of the U.S. DOE CASL and EC NURESAFE projects.…”

Initial Verification and Validation Assessment for VERA

“…Within CASL, MPACT, CTF, and Star CCM+ are the primary codes utilized for making predictions. CTF is particularly well-suited for this CP owing to its history as a design basis accident code for loss of coolant accidents [32].…”

“…Computational fluid dynamics also plays an important role, though not within VERA. The current, main CASL toolset includes the following software modules: 29 30] o CTF-Thermal-Hydraulics [31][32][33] o MAMBA-Chemistry [ 35 36] o BISON-Fuel Performance [34] • Star CCM+-Computational Fluid Dynamics [37] In addition to the main software tools, several other software utilities are used to pass data between the main codes and to solve multi-physics equations. These are principally capability within CTF to couple with MPACT and with MAMBA, TIAMAT which couples MPACT and BISON and CICADA which couples Star CCM+ with MAMBA.…”

Development and Testing of CTF to Support Modeling of BWR Operating Conditions

“…When set to "1," CTF will assume it is modeling a BWR and will do a few things differently (discussed below). The CTF User Manual has been updated with this change [4].…”