
  fct/model/: programs: zalesak, ppm 
  
  Numerical solution of model hyprbolic PDE: dr/dt + df(r)/dx = 0
  using one-step conservative scheme; 4 kinds of flux evaluation:
  
    (1) Donor cell            0(dx,   dt)  "cat *.in 1/in  | ./zalesak"
    (2) FCT-2-1               0(dx^2, dt)  "cat *.in 2/in  | ./zalesak"   
    (3) FCT-4-1               0(dx^4, dt)  "cat *.in 4/in  | ./zalesak"
    (4) Godunov (p-parabolic) 0(dx^?, dt)  "cat *.in pp/in | ./ppm"

  for 2 examples of flux function:
    (a) f(r) = C =  

  at Courant number = 0.5;

  It is demonstrated that:
  
    (1):
    - FCT-2-1 
	is better than 
    - Godunov (p-parabolic)
	which is better than
    - Donor cell
    
    (2): solutions by FCT-2-1 and FCT-4-1 are both
    good enough; may be FCT-4-2 (two-step sheme) will be the best ("-?-")

    (3): for nonlinear problem with f(r) = C*u*u the solution
    given by FCT-2-1 is bad; may be with FCT-2-2 it will be OK ("-?-")  

