19.6.1 Monitoring ISAT

You can monitor ISAT performance by setting the Verbosity in the Integration Parameters dialog box. For a Verbosity of 1 or 2, ANSYS FLUENT writes the following information periodically to a file named case-file-name_stats.dat:

• total number of queries

• total number of queries resulting in retrieves

• total number of queries resulting in grows

• total number of queries resulting in adds

• total number of queries resulting in direct integrations

• cumulative CPU seconds in ISAT

• cumulative CPU seconds outside ISAT

• cumulative wall-clock time in seconds (i.e., total CPU time in ISAT plus total CPU time out of ISAT plus CPU idle time)

The ISAT Verbosity option of 2 is for expert users who are familiar with ISATAB v4.0 [ 64]. ANSYS FLUENT writes out the following files for Verbosity = 2:

• tablename_stats.out, as described above

• tablename_ODE_accuracy.out reports the accuracy of the ODE integrations. For every new ISAT table entry, if the maximum absolute error in temperature or species is greater than any previous error, a line is written to this file. This line consists of the total number of ODE integrations performed up to this time, the maximum absolute species error, the absolute temperature error, the initial temperature and the time step.

• tablename_ODE_diagnostic.out prints diagnostics from the ODE solver

• tablename_ODE_warning.out prints warnings from the ODE solver

Initially, the table name is equal by default to the current case name, and is changed as the table is written or read.

In parallel, each processor builds its own ISAT table. If Verbosity is enabled in parallel, each compute node writes out the Verbosity file(s) with the node ID number appended to the file name.