<< Click to Display Table of Contents >> Navigation:  Appendix A Examples > Example 8: Diffusion with Initial Concentration Profile > Data Entry

Open the Examples project and open Case 8.

 

 

General Tab

 

 

On the General tab the Darcy velocity is set to zero for pure diffusion. The concentrations can either be calculated at specified times or the time of the maximum concentration can be found. In this example the concentrations will be calculated at 5 times: 3, 6, 9,

12, and 15 years.

 

 

Layers Tab

 

 

There are no fractures in these layers. For pure diffusion even if there were fractures it should be modelled as if the soil was unfractured, since there would be no flow in the fractures for pure diffusion.

 

 

Boundaries Tab

 

 

In this example, the top boundary has a finite mass and the bottom boundary is represented as a zero flux layer.

 

 

Special Features

 

The initial concentration profile for this example is specified using the Special Features tab.

 

 

Initial Concentration Profile

 

 

To specify the initial concentration profile, check the Initial Concentration Profile box on the Special Features tab.