Transient Fixed Mass Module

This module was developed by ATA Engineering as an add-on to the Loci/CHEM computational fluid dynamics (CFD) solver. The module can be used to extend Loci/CHEM's fixedMass boundary condition to accept time varying data.

Dependencies

This module depends on both Loci and CHEM being installed. Loci is an open source framework developed at Mississippi State University (MSU) by Dr. Ed Luke. The framework provides a rule-based programming model and can take advantage of massively parallel high performance computing systems. CHEM is a full featured open source CFD code with finite-rate chemistry built on the Loci framework. CHEM is export controlled under the International Traffic In Arms Regulations (ITAR). Both Loci and CHEM can be obtained from the SimSys Software Forum hosted by MSU.

Installation Instructions

First Loci and CHEM should be installed. The LOCI_BASE environment variable should be set to point to the Loci installation directory. The CHEM_BASE environment variable should be set to point to the CHEM installation directory. The installation process follows the standard make, make install procedure.

make
make install

Usage

First the module must be loaded at the top of the vars file. The fixedMass boundary condition may be tagged with either transientMassFlux or transientMdot to specify a file containing the time varying boundary condition data.

loadModule: transientFixedMass

boundary_conditions: <BC_1=fixedMass(transientMassFlux="massFlux.dat"),
                      BC_2=fixedMass(transientMdot="mdot.dat")>

The format of the specified file should be the following, where the mass quantity will be either the mass flux or mass flow rate depending on whether transientMassFlux or transientMdot is specified. The file should use SI units for all quantities.

number_of_species
species_name_1 species_name_2 ... species_name_n
number_of_time_points
time_1 mass_quantity_1 T0_1 mass_fraction_1_1 mass_fraction_1_2 ... mass_fraction_1_n
time_2 mass_quantity_2 T0_2 mass_fraction_2_1 mass_fraction_2_2 ... mass_fraction_2_n
...
time_m mass_quantity_m T0_m mass_fraction_m_1 mass_fraction_m_2 ... mass_fraction_m_n