pde - Freefem Fisher's equation -

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I'm new to free +++, the problem I am trying to solve is Fisher's equation: 
  
 
  du / dt = d ^ 2u / dx ^ 2 + d ^ 2u / dy ^ 2 + k * u * (1-U) du / dn = 0 - condition of limit   
 I have a weak problem The problem is with Futur formula (Uh, VH) = int2d (th) (uh * VH / dt + grad (uh)). * Grad (VH) - Int 2D (Th) (K * UH * VH) + Int 2D (Th) (UH 0 * VH / D T) - Int 2D (Gu) (K * Uh * VH * Uh);   
 Can you please tell me what do I do wrong? There is something wrong with the final conditions.   
 
 
 This is a 2D transient diffusion / conduction equation with a temperature-dependent, non-linear generation duration .  
 If you skip the non-linear generation period, the equation 2D should look like a weak form for transient diffusion / conduction equation.  
 How to call free + + non-linear words? How do you plan to handle it?  
 You know, after all, it means that the solution is a very different animal. You have to walk in time to solve this (eg a Newton-Repson Solver).  
 The algorithm becomes an iterative, non-linear one. You will not solve for now; You will solve a salary increase and repeat until convergence.  
 You can repeat the last word like this:  
  d (k * u (1-u)) = k * du (1-u) - k * U * du = k * (1-2 * u) * du ~ k * du   
 You still have a product that is * non-linear. What to do? throw it away.  
 Now you are solving a non-linear transient equation for  du .

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