Files in FLACS

FLACS stores job data in a set of files. For the arbitrary job number 010100, the following files can be created:

• Header file, 010100.caj: ASCII file created by CASD; defines the cs, co, and cg files used by CASD.

• Geometry file, co010100.geo: binary file created by CASD; contains a list of primitives that define the geometry; used by FGC and Flowvis. The geometry file is also called the obstruction file, or co-file. It is not a direct input to the simulation, but it is used by FGC when generating the porosity file.

• Grid file, cg010100.dat3: binary file created by CASD; defines the computational mesh; used by CASD, Flacs, and Flowvis.

• Porosity file, cp010100.dat3: binary file created by the porosity calculator, FGC (typically from the Porosities menu in CASD); defines the porosities for each grid cell; used by Flacs and Flowvis.

• Scenario file, cs010100.dat3: ASCII file created by CASD; defines the general scenario (monitor points, output variables, fuel region, pressure relief panels, ignition position, etc.); used by CASD, Flacs, and Flowvis

The following optional files can also be created:

• Setup file, cs010100.SETUP: access to advanced settings for the models, solver variants, time stepping etc. as well as allowing the user to define high temperature and high pressure regions.

• Thermally active walls, cs010100.TWALL: used to define thermally active walls which conduct heat and change temperature over time.

• Cloud file, cs010100.CLOUD: used to define fuel clouds of arbitrary shape.

• Events file, cs010100.EVENTS: used to manipulate parameters of leaks and panels using timers or triggered by a number of variables.

• Heat file, cs010100.HEAT: used to specify heat transfer by convection (should be used for testing purposes only)

• Pool leak file, cs010100.POOL: defines a pool leak using mass flow rate over time, requires definition of a POOL in the cs-file.

• Leak file, cl010100.n001: defines time-dependent leaks of fuel or suppressant.

• Runtime simulation control file, cc010100.dat3: can be used to write dump files, write results and stop the simulation at a specified iteration number, time or fuel level.

• Time dependent CFL file, cn010100.dat3: used to specify time dependent CFL numbers. Can be used to reduce the timestep during periods where increased stability is required or increased in steady flow periods.

• Monitor file, cs010100.MON: used to define multiple monitor regions.