说明：  Wanger 教授的D1Q3源代码, 是经典的LBM程序
(Lattice boltzmann by professor Wanger An implementation of the D1Q3 model for non-ideal systems You should have received a copy of the GNU General Public License along with this program if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA)