How many boundary conditions should I have for a 2-D transient pde?

[bzz77]

Hello all:

I'm a newbie, trying to write/use code for solving a 2D advection-diffusion problem. I'm not sure how many boundary conditions I should have for the property that is being transported.

In my problem, I have diffusion switched off (advection only). The property being transported (from left to right) is a chemical element. I have its initial mass as an initial condition. I have specified its mass at the left boundary. Do I need a second boundary condition at the right?

Thanks for any advice.

 

[yus310]

Hello all:

I'm a newbie, trying to write/use code for solving a 2D advection-diffusion problem. I'm not sure how many boundary conditions I should have for the property that is being transported.

In my problem, I have diffusion switched off (advection only). The property being transported (from left to right) is a chemical element. I have its initial mass as an initial condition. I have specified its mass at the left boundary. Do I need a second boundary condition at the right?

Thanks for any advice.

You should. If it is the iterative, then you will need to account for front and end conditions.