Driver/DriverMain allowDtSTSDominate [BOOLEAN] [FALSE] allow a situation in which dt_STS becomes larger than dt_Hydro (dt_advection) (assuming that diffusion dt is smaller than advection dt) upto advection one, but not faster than the advection advancement. This will be useful in solving PDE systems that are hyperbolic + parabolic. FALSE will use the STS algorithm to even accelerate advection time advancement, which in turn, will use larger advection dt than advection dt from CFL limits. This will be useful in solving only hyperbolic PDE systems in general. When hyperbolic + parabolic PDE system is to be solved, then we suggest that users use less agressive super time stepping method by using useSTSforDiffusion = TRUE. dr_abortPause [INTEGER] [2] Valid Values: 0 to INFTY When Driver_abortFlash is called to abnormally end execution, and dr_abortPause is grater than zero, the FLASH Driver_abortFlash code will sleep for dr_abortPause seconds after writing explanatory messages (to standard output and, possibly, to log files) but before calling MPI_ABORT. See also eachProcWritesOwnAbortLog for controlling the generation of per-processor log files. dr_dtMinBelowAction [INTEGER] [1] Valid Values: 0, 1 Action to take when computed new timestep is below dr_dtMinContinue. Use 0 for none (abort immediately), 1 for "write checkpoint then abort" dr_dtMinContinue [REAL] [0.0] Valid Values: 0.0 to INFTY Minimum computed timestep to continue the simulation dr_numPosdefVars [INTEGER] [4] Valid Values: 0 to 4 number of variables for positive-definite time step limiter dr_posdefDtFactor [REAL] [1.0] Valid Values: -1.0, 0.0 to INFTY Scaling factor for dt limit from positive-definite time step limiter. Similar to CFL factor. If set to -1, use CFL factor from Hydro. dr_posdefVar_1 [STRING] ["none"] Valid Values: Unconstrained variable dr_posdefVar_2 [STRING] ["none"] Valid Values: Unconstrained variable dr_posdefVar_3 [STRING] ["none"] Valid Values: Unconstrained variable dr_posdefVar_4 [STRING] ["none"] Valid Values: Unconstrained variable dr_printTStepLoc [BOOLEAN] [TRUE] dr_shortenLastStepBeforeTMax [BOOLEAN] [FALSE] If TRUE, make the dt for the last time step shorter if necassary so as to avoid overshooting tmax. dr_tstepSlowStartFactor [REAL] [0.1] Valid Values: 0.0 to INFTY The initial dt is set to be at most the timestep computed by CFL conditions applied to certain operators multiplied with this factor. dr_usePosdefComputeDt [BOOLEAN] [FALSE] turns positive-definite time step limiter on. drift_break_inst [INTEGER] [0] Valid Values: Unconstrained drift_trunc_mantissa [INTEGER] [2] Valid Values: Unconstrained number of mantissa bits to exclude from hash (3 bits ~ 1 sigdig) drift_tuples [BOOLEAN] [FALSE] should block data be written in python tuples format drift_verbose_inst [INTEGER] [0] Valid Values: Unconstrained dtinit [REAL] [1.E-10] Valid Values: Unconstrained Initial timestep dtmax [REAL] [1.E5] Valid Values: Unconstrained Maximum timestep dtmin [REAL] [1.E-10] Valid Values: Unconstrained Minimum timestep eachProcWritesOwnAbortLog [BOOLEAN] [FALSE] Should each process writes messages to its own log file when Driver_abortFlash gets called to abnormally end execution? If true, each process in which Driver_abortFlash is called will attempt to write an explanatory message to its own log file, whether that file already existed or needs to be newly created. If false, the Driver_abortFlash message will appear only in the regular log file (if the Logfile code unit is used), and normally only when Driver_abortFlash is called by the process with PE 0. iProcs [INTEGER] [1] Valid Values: Unconstrained number of procs in the i dir jProcs [INTEGER] [1] Valid Values: Unconstrained number of procs in the j dir kProcs [INTEGER] [1] Valid Values: Unconstrained number of procs in the k dir meshCopyCount [INTEGER] [1] Valid Values: Unconstrained The number of copies of full computational mesh that nbegin [INTEGER] [1] Valid Values: 1 to INFTY First timestep nend [INTEGER] [100] Valid Values: Unconstrained Maximum number of timesteps to take nstepTotalSTS [INTEGER] [5] Valid Values: Unconstrained nuSTS [REAL] [0.1] Valid Values: Unconstrained nu stability parameter for super time stepping algorithm restart [BOOLEAN] [FALSE] Is this a restart run? sweepOrder [INTEGER] [123] Valid Values: 123, 132, 213, 231, 312, 321 Determine the order of the directional sweeps threadBlockListBuild [BOOLEAN] CONSTANT [TRUE] threadDriverBlockList [BOOLEAN] [TRUE] threadDriverWithinBlock [BOOLEAN] [TRUE] threadRayTraceBuild [BOOLEAN] CONSTANT [TRUE] threadWithinBlockBuild [BOOLEAN] CONSTANT [TRUE] tinitial [REAL] [0.0] Valid Values: Unconstrained Initial simulation time tmax [REAL] [0.2] Valid Values: Unconstrained Maximum simulation time tstep_change_factor [REAL] [2.0] Valid Values: 0.0+ to INFTY The initial time step dt is multiplied with this factor at every timestep, until it is limited by CFL condition, allowing users to specify a very conservative initial dt and letting it grow by specifying a tstep_change_factor > 1.0. useSTS [BOOLEAN] [FALSE] Do we want to use super time stepping (STS) algorithm? useSTSforDiffusion [BOOLEAN] [FALSE] TRUE will use the STS algorithm to accelerate diffusion time advancement wall_clock_time_limit [REAL] [604800.] Valid Values: -1.0, 0.0 to INFTY Total wall clock time limit (seconds). Use -1.0 for no limit. zFinal [REAL] [0.0] Valid Values: Unconstrained The final redshift in a simulation. The simulation will stop zInitial [REAL] [-1.0] Valid Values: Unconstrained The initial redshift in a simulation. < 0 if not being used.

High-Energy Density Physics

Thermonuclear-Powered Supernovae

Fluid-Structure Interaction

Implicit Solvers

Code Requests

Download

Contributed code

Flash Test downloads

Visualization downloads

Documentation and User Support

Publications

FLASH internal

The Flash Center for Computational Science is based at the University of Chicago and is supported by U.S. DOE and NSF.