LES simulation of gas flow in a duct with a square-shaped cross-section

1. Compile "duct.c", run executable, and when needed press [Ctrl+C] to terminate.
2. To continue the previously terminated or finished simulation, set Answer=1 in "duct.ini" file.
3. Process output of "duct" using "duct_p" and "duct_pp" utilities.
4. Plot output files e.g. with "gnuplot" utility.