wave		problem: free-surface flow over a step

none 		infile: file to read initial values from
none  		outfile: file to write final values

40.0		xlength: domain size in x-direction
10.0		ylength: domain size in y-direction
128		imax: number of interior cells in x-direction
32		jmax: number of interior cells in y-direction

125.0		t_end: final time
0.01		delt: time stepsize
0.15            tau:  safety factor for time stepsize control

1000.0		del_trace: time step for writing particles for particle tracing
0.0625		del_inj:   time step for injecting particles
2.0		del_streak:time step for writing particles of streaklines
10.0 		del_vec:   time step for writing velocity and pressure values

none            file to write velocity and pressure values
none 		file to write particle positions for particle tracing
none            file to write particle positions of streaklines

30		N: number of particlelines
0.03125		pos1x: coordinates of the final points
5.03125		pos1y: of the line on which
0.03125		pos2x: particles for particle tracing
7.46875		pos2y: and streaklines are injected

500		itermax: maximal number of pressure iterations in one time step
0.001		eps : stopping tolerance for pressure iteration
1.7		omg : relaxation parameter for SOR iteration
0.5		gamma: upwind differencing factor   
2               p_bound: flag for treatment of the pressure boundary conditions
                         1 = modify the equation at the boundary (book p. 37)
                         2 = copy pressure values near the boundary (book p. 39)

10	       	Re: Reynolds number
1.0		Pr: Prandtl number
0.0    		beta: coefficient of volume expansion
0.0		GX:            
-0.5		GY: volume forces, e.g. gravity
1.0		UI:
0.0		VI: initial values
0.0             TI:

3		wW: flags for boundary conditions
3		wO:   1 = slip         3 = inflow/outflow
2		wN:   2 = no-slip      4 = periodic
2		wS: