**This is an old revision of the document!** ----
====== poincare ====== compute crossings of a Poincare section in a pre-computed trajectory ===== Options ===== <code> options : -T0 --T0 <real> default == 0 start time -T1 --T1 <real> default == 100 end time -dT --dT <real> default == 1 save interval -d --datadir <string> default == data/ flowfield series directory -o --poindir <string> default == poincare/ output dir for Poincare crossings -vdt --variabledt adjust dt to keep CFLmin<=CFL<CFLmax -dt --dt <real> default == 0.03125 timestep -dtmin --dtmin <real> default == 0.001 minimum time step -dtmax --dtmax <real> default == 0.05 maximum time step -CFLmin --CFLmin <real> default == 0.4 minimum CFL number -CFLmax --CFLmax <real> default == 0.6 maximum CFL number -ts --timestepping <string> default == sbdf3 timestepping algorithm -nl --nonlinearity <string> default == rot method of calculating nonlinearity -R --Reynolds <real> default == 400 Reynolds number -c --channel channelflow instead of plane Couette -b --bulkvelocity hold bulk velocity fixed, not pressure gradient -P --dPdx <real> default == 0 value for fixed pressure gradient -U --Ubulk <real> default == 0 value for fixed bulk velocity <flowfield> (trailing arg 2) fixed pt of poincare map <flowfield> (trailing arg 1) e, for poincare condition (u(t)-u*, e) = 0 </code> ===== Usage examples =====
