Page 4 of 5

So far, so good. It is now time to add diffusion. As before, we begin with creating a compartment model.

Editing the model structure

1. Open the first model. Smile.
2. Connect Layer_1 and Layer_2 with a Transfer block. Name the block “Diffusion_1_2”.
3. Connect Layer_2 and Layer_1 with a Transfer block. Name the block “Diffusion_2_1”.
4. Connect Layer_2 and Layer_3 with a Transfer block. Name the block “Diffusion_2_3”.
5. Connect Layer_3 and Layer_2 with a Transfer block. Name the block “Diffusion_3_2”.
6. Connect Layer_3 and Out with a Transfer block. Name the block “Diffusion_3_Out”.

Assigning values

Edit Diffusion_1_2. Assign the expression “D/(R * dx²)” where:

Assign the same expression to all the diffusion Transfer blocks.

Run a simulation and make a plot of Flux_Out. What has happened to the curve?

Save the project.

Solution to this part

• solution_transport_3.eco

Next

• Adding Diffusion to the Transport Model (5/5)

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• Creating a Transport model (3/5)

References

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