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When doing restarts, which is a continuation of a previous
solution, there are a couple of options available in the CFD-ACE-GUI regarding where
the data comes from along with output and time options. This user tip will detail the various options
available to the user.
For restarts, there are two options for the initial
conditions which are:
-
Previous Solution
- User Specified + Previous Solution
Figure 1. Restart options on the IC tab
The first option is the simplest. In this case, all of the simulation data
needed will come from the Restart File that is specified in the Restart
Filename field. You can use the same
file name or one different from your current simulation. If you use the same file name, note that the
results in the .DTF file will be over written.
The second option is a combination of User Specified and
Previous Solution. For this case, there
are now two options for all of the variable tabs allowing the selection of
Previous Solution or Constant.
An example of where this option might be used is when the
solution of additional variables has been selected. For instance, if a simple flow case was solved
and then turbulence was added later, then the flow variables would come
from the previous solution while the turbulence quantities would be given a
constant value. Note these options can
be applied to all volumes or on a volume by volume basis.
There are also several check boxes (see figure 2), depending on the time dependency (steady or transient) and if monitor points are used, that control the output
for restart cases. They are:
-
Reset Time to 0 Second (for transient cases)
-
Append Residual File
-
Append Output File
-
Append Monitor File (when Monitor Point option is used)
Figure 2. File output options for restart
For transient cases, the user has the option to reset the
time back to zero or to continue from the last time in the restart DTF
file.
The append options allow the user
to add on to the end of the previous model.RSL, model.out, or model.MON files. If appending the residual file, then iteration number continues from that in the DTF file, i.e. if you stopped at 81 and restart from the end of the 50th iteration, the next residual in the RSL file will be 51. Note that the Monitor Point file behavior is the same as the residual file. However, in the output file, the data from the 50th iteration to the 81st iteration will not be removed.
If you have any questions on this tip or have suggestions
on future tips, please let us know.
Regards,
ESI CFD Support Team
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