RSICC Home Page RSICC CODE PACKAGE CCC-871

1.           NAME AND TITLE

CTF: CTF is the modernized version of the legacy subchannel thermal hydraulics (TH) code COBRA-TF and is being developed jointly by Oak Ridge National Laboratory (ORNL) and North Carolina State University (NCSU).

AUXILLARY PROGRAMS REQUIRED (Installed using omnus.sh)

CMAKE              https://cmake.org/files/v3.17/cmake-3.17.0.tar.gz

GCC                    https://ftp.gnu.org/gnu/gcc/gcc-8.3.0/gcc-8.3.0.tar.gz

MPICH            http://www.mpich.org/static/downloads/3.3.2/mpich-3.3.2.tar.gz

AUXILLARY LIBRARIES REQUIRED (Installed using vera_tpls/TPL_build/install_tpls.sh)

LAPACK/BLAS              https://code.ornl.gov/casl/vera_tpls/-/tree/vera-tpls-4.2

HDF5                  https://code.ornl.gov/casl/vera_tpls/-/tree/vera-tpls-4.2

PETSC                https://code.ornl.gov/casl/vera_tpls/-/tree/vera-tpls-4.2

2.           CONTRIBUTORS

              Oak Ridge National Laboratory and North Carolina State University.

3.           CODING LANGUAGE AND COMPUTERS

Fortran, C/C++, Python; Linux (C00871PCX8600).

4.           NATURE OF PROBLEM SOLVED

CTF is a TH subchannel code designed for modeling of light-water reactor (LWR) fuel bundle geometry.  It is used to solve nominal and off-normal conditions in pressurized water reactor and boiling water reactor designs. The code can solve single- or two-phase flow in steady-state or transient conditions. It includes a solver for fuel rod geometry, allowing for prediction of fuel rod behavior and temperature distribution.

5.           METHOD OF SOLUTION

CTF uses a two-fluid, three-field (i.e., fluid film, fluid drops, and vapor) modeling approach. Both subchannel and 3D Cartesian forms of mass, momentum, and energy conservation equations are available for LWR modeling. CTF includes a wide range of TH models important to LWR safety analysis, including flow regime–dependent, two-phase wall heat transfer; inter-phase heat transfer and drag; droplet breakup; and quench-front tracking.

6.           RESTRICTIONS OR LIMITATIONS

Users must be approved for access to CTF in accordance with software distribution requirements set by the inter-institutional agreement between ORNL and NCSU.

7.           TYPICAL RUNNING TIME

Run time varies based on platform and complexity of the input being executed, ranging from seconds to hours depending upon the scope and complexity of the problem and the hardware systems on which it is executed.

8.           COMPUTER HARDWARE REQUIREMENTS

Linux platforms are supported. A machine with multiple processors is recommended depending on desired level of parallelization.

9.           COMPUTER SOFTWARE REQUIREMENTS

Linux-based operating system with functioning gcc, g++ and gfortran compilers available.

Detailed system software and third-party library requirements are specified in the CTF installation guide.

10.         REFERENCES

List of supplied documentation provided in the package include CTF User’s Manual, Theory Manual, Programmer guide etc.,

11          CONTENTS OF CODE PACKAGE

The package will be transmitted on a DVD or via download link, which includes instructions for executable access, sample inputs, test problems, documentation, and reference material.  

12.         DATE OF ABSTRACT

              March 2023.

               KEYWORDS: THERMAL HYDRAULICS, SUBCHANNEL.