- **Applied Math**
(*http://mymathforum.com/applied-math/*)

- - **drift-diffusion equation**
(*http://mymathforum.com/applied-math/1768-drift-diffusion-equation.html*)

drift-diffusion equationI have the next drift-diffusion equation: \frac{\partial \phi(x,y,z)}{\partial t} + u_x(z) \frac{\partial \phi(x,y,z)}{\partial x} = \nabla D(z) \nabla \phi (x,y,z) where D(z) is a matrice. To solve this equation i perform the next change of variable: X = x + u(z) t , Y= y , Z=z, T=t and then I apply the Fourier transformation and when I solve this integrals with maple, at the first integral maple said that it is undefined. Maybe I can solve the problem applying other change of variable taking into account for example Z=z - \nabla D(z) or maybe I should replace also in \nabla D(z) the change of variable. I am not sure if I can doing this options. Could someone help me? p.s. I cannot write in LaTex, I donĀ“t know why. |

All times are GMT -8. The time now is 12:29 PM. |

Copyright © 2018 My Math Forum. All rights reserved.