rayleigh	problem: flow past an obstaclenone 		infile: file to read initial values fromnone  		outfile: file to write final values4.0		xlength: domain size in x-direction1.0		ylength: domain size in y-direction40		imax: number of interior cells in x-direction10		jmax: number of interior cells in y-direction6.0e3		t_end: final time0.0125		delt: time stepsize0.5             tau:  safety factor for time stepsize control10000.0		del_trace: time stepsize for writing particle positions for particle tracing10000.0		del_inj:   time stepsize for injecting particles10000.0		del_streak:time stepsize for writing particle positions of streaklines500.0		del_vec:   time stepsize for writing velocity and pressure valuesrayleigh.out	file to write velocity and pressure valuesnone 		file to write particle positions for particle tracingnone        	file to write particle positions of streaklines0		N: number of particlelines0.0		pos1x: coordinates of the final points0.0		pos1y: of the line on which0.0		pos2x: particles for particle tracing0.0		pos2y: and streaklines are injected500		itermax: maximal number of pressure iterations in one time step1e-5		eps : stopping tolerance for pressure iteration1.7		omg : relaxation parameter for SOR iteration1.0		gamma: upwind differencing factor   2               p_bound: flag for the treatment of the pressure boundary conditions                         1 = modify the equation at the boundary (book p. 37)                         2 = copy the pressure values near the boundary (book p. 39)4365.0	       	Re: Reynolds number0.72		Pr: Prandtl number3.4e-3    		beta: coefficient of volume expansion0.0		GX:            -0.6432		GY: volume forces, e.g. gravity0.0		UI:0.0		VI: initial values0.0             TI:2		wW: flags for boundary conditions2		wO:   1 = slip         3 = inflow/outflow2		wN:   2 = no-slip      4 = periodic2		wS: