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Used of batch computation

The observation of instability with a numerical study is very hard. In order to reach this objective, the computation needs to be the most precise as possible.
The consequence is that the time of calculation could be very long. Moreover, it's not really interesting.
For these reason we have looked in the help of FLUENT for a way to make a batch calculation.
This possibility exists in FLUENT, it just need an instructions file and it returns a file which contains all what it do. The syntax is :


fluent 2d -g <commande>& batch.out&

An example of ``commande'' file is :


rc def.cas  
rd def.dat
solve/set/time-step 0.01
solve/set/reporting-interval 20
solve/dual-time-iterate 10
it 100
wd def10.dat
solve/set/time-step 0.01
solve/set/reporting-interval 20
solve/dual-time-iterate 10
it 100
wd def20.dat
solve/set/time-step 0.01
solve/set/reporting-interval 20
solve/dual-time-iterate 10
it 100
wd def30.dat
solve/set/time-step 0.01
solve/set/reporting-interval 20
solve/dual-time-iterate 10
it 100
wd def40.dat
solve/set/time-step 0.01
solve/set/reporting-interval 20
solve/dual-time-iterate 10
it 100
wd def50.dat
solve/set/time-step 0.01
solve/set/reporting-interval 20
solve/dual-time-iterate 10
it 100
wd def60.dat
solve/set/time-step 0.01
solve/set/reporting-interval 20
solve/dual-time-iterate 10
it 100
wd def70.dat
solve/set/time-step 0.01
solve/set/reporting-interval 20
solve/dual-time-iterate 10
it 100
wd def80.dat
solve/set/time-step 0.01
solve/set/reporting-interval 20
solve/dual-time-iterate 10
it 100
wd def90.dat
solve/set/time-step 0.01
solve/set/reporting-interval 20
solve/dual-time-iterate 10
it 100
wd def100.dat
exit

This ``commande'' file begins with the instructions for read a FLUENT case, then a data file. After that it executes the computation and after $ 10$ time steps it saves the data in a file. With this file it does that $ 10$ times.

With this batch treatment of the computations, we have to be more concentrated on the case that on the time of the computation. It was very pleasant.


next up previous contents
Next: Dimensionnal study Up: Modelisation of the problem Previous: General remarks and models   Contents
Stephanie Terrade
Julien Delbove
2000-11-06