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 the viscousWall boundary condition to allow it to specify a time varying boundary condition. It is intended to be used with transient flow simulations that use either an adiabatic, isothermal, or isoflux boundary condition for the wall.
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. This module also requires a compiler with C++11 support.
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 installFirst the module must be loaded at the top of the vars file. Any viscousWall boundaries conditions may be tagged with the transient tag. The adiabatic, Twall, or qwall options can be used to specify the name of a file which contains the time varying wall data.
loadModule: transientWall
boundary_conditions: <BC_1=viscousWall(transient, Twall="wall.dat"), ...>
In the above example, the wall.dat file would look something like below. The first line is the number of time points to follow. The following lines list the time, wall temperature, and wall velocity for the boundary. For an isoflux wall the heat flux is specified instead of the wall temperature. For an adiabatic wall, only the velocity is specified. In all cases, the data should be input in SI units.
3
0 400 0 0 0
0.1 500 0 0 0
0.2 600 10 0 0