Difference between revisions of "FINIX fuel behavior module"
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=== Modifying material TMS temperature limits === | === Modifying material TMS temperature limits === | ||
| − | Linking Serpent pins with FINIX solvers sets on the on-the-fly [[TMS on-the-fly temperature treatment routine|TMS temperature treatment]] for the cross section data. | + | Linking Serpent pins with FINIX solvers sets on the on-the-fly [[TMS on-the-fly temperature treatment routine|TMS temperature treatment]] for the cross section data. The TMS method uses estimates for minimum and maximum temperatures of the materials it handles to increase the performance of the rejection sampling it uses. When a static [[multi-physics interface]] is linked to the main input the TMS limits are set to the minimum and maximum temperatures found in the interface, but in a typical coupled multi-physics calculation, the minimum and maximum temperature of each material is not known beforehand. In this case, the TMS limits must be set by hand before the beginning of the calculation. |
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| + | <nowiki>mat <name> <density> tft 557.0 2100.0 [...]</nowiki> | ||
=== Setting up the iteration scheme === | === Setting up the iteration scheme === | ||
Revision as of 11:30, 27 November 2015
Contents
About FINIX
FINIX is a novel light-weight fuel behavior code designed specifically for coupled calculations by T. Ikonen at VTT[1]. FINIX solves both the temperature distribution in the fuel rod and the heat flux from cladding to coolant allowing two-way couplings with both neutronics and thermal-hydraulics solvers. While the current capabilities of FINIX are specifically directed to calculating the fuel rods' thermal response in fast transient scenarios, FINIX can also be used to calculate steady state conditions.
The correlations used in FINIX are publicly available. The fuel rod is modeled in FINIX as consisting of separate axial zones that are coupled via the gas gap pressure. The thermal and mechanical models in each of the axial zones are coupled via the gas gap pressure and heat conductance.
FINIX uses the so-called 1.5 dimensional geometry model dividing the active length of the fuel rod into multiple axial zones. In each axial zone the fuel pellet and the cladding are divided into multiple concentric radial rings. The axial coupling between the different zones comes from the coolant temperature boundary condition and rod internal pressure.
Coupling with Serpent
FINIX is coupled with Serpent 2 at the source code level. The internal coupling works with direct memory access between Serpent and FINIX simplifying the solution transfer and use.
Obtaining FINIX
FINIX can be licensed from VTT for research & education (non-commercial) purposes. One license agreement per organization is enough.
Finally, contact Ville Valtavirta to obtain the latest version of FINIX to add to your Serpent source code.
Compiling Serpent with FINIX
The source code for FINIX should be located in the Serpent source code folder in a subfolder called FINIX.
<sss_source_code_folder>/FINIX/
To complile Serpent with FINIX, uncomment two lines from the Makefile:
... # Compilation with FINIX: #OBJS += $(FOBJS) #CFLAGS += -DFINIX ...
is uncommented to
... # Compilation with FINIX: OBJS += $(FOBJS) CFLAGS += -DFINIX ...
Running the make-command for the uncommented Makefile will compile Serpent with FINIX-capabilities. Any errors encountered in the compilation process should be reported to Ville Valtavirta.
Usage
Linking FINIX input files
Creating powerbinning to be used with FINIX solvers
Creating FINIX solvers for Serpent pins
Modifying material TMS temperature limits
Linking Serpent pins with FINIX solvers sets on the on-the-fly TMS temperature treatment for the cross section data. The TMS method uses estimates for minimum and maximum temperatures of the materials it handles to increase the performance of the rejection sampling it uses. When a static multi-physics interface is linked to the main input the TMS limits are set to the minimum and maximum temperatures found in the interface, but in a typical coupled multi-physics calculation, the minimum and maximum temperature of each material is not known beforehand. In this case, the TMS limits must be set by hand before the beginning of the calculation.
mat <name> <density> tft 557.0 2100.0 [...]
Setting up the iteration scheme
References
- ^ T. Ikonen, V. Tulkki, E. Syrjälahti, V. Valtavirta and J. Leppänen, "FINIX - Fuel Behavior Model and Interface for Multiphysics Applications", In proc. TopFuel 2013, Charlotte, NC, Sept. 15-19, 2013.
