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As simulation file sizes get bigger and bigger, we are always looking
for ways to decrease the amount of data stored. A new option has been
added to CFD-ACE+ that allows you to NOT save the restart data to the
DTF file. This can reduce file size by as much as 40% for some large
models.
Basically, the DTF file has two sets of solution data: one is for visualization (what you see in CFD-VIEW) and one for restart purposes (allowing you to restart the simulation to run further or restart it with different parameters).
Many times, a simulation will be run only one time to convergence, and will never be used as a restart point. Up until now, both the visualization and restart data were written into DTF files, which can make them unnecessarily large.
A brand new option, now available in CFD-ACE+ version 2008.2.9, is the ability to choose whether or not the restart data will be written to the DTF file. This option can be found in the 'OUT' panel, under the 'Ouput' tab, as shown in figure 1.
Figure 1: Restart data check box in CFD-ACE-GUI
By default, the "Write Restart Solution Data" option is activated, meaning that the restart data WILL be written to the DTF file. Uncheck it and the restart data will not be written to the DTF file, thus making it much smaller, up to 40% size reduction. Be careful though, as you will not be able to use the file as initial conditions for steady or unsteady simulations.
Regards,
Olivier Demaneuf
ESI CFD Support Team
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