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====== Tutorial 7 - Adding diffusion to the compartment model ======

===== 4/5 =====

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

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**Editing the model structure**

  - Open the first model. Smile.
  - Connect //Layer_1// and //Layer_2// with a [[Transfer|Transfer]] block. Name the block “Diffusion_1_2”.
  - Connect //Layer_2// and //Layer_1// with a [[Transfer|Transfer]] block. Name the block “Diffusion_2_1”.
  - Connect //Layer_2// and //Layer_3// with a [[Transfer|Transfer]] block. Name the block “Diffusion_2_3”.
  - Connect //Layer_3// and //Layer_2// with a [[Transfer|Transfer]] block. Name the block “Diffusion_3_2”.
  - Connect //Layer_3// and //Out// with a [[Transfer|Transfer]] block. Name the block “Diffusion_3_Out”.

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{{tutorial_7_5.png?600}}
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**Assigning values**

<HTML><ol></HTML>
<HTML><li></HTML><HTML><p></HTML>Edit //Diffusion_1_2//. Assign the expression “D/(R * dx<sup>2</sup>)” where:<HTML></p></HTML>
<HTML><p></HTML>\\
<HTML></p></HTML>
^**Name**^**Type** ^**Unit**                       ^**Full Name**        ^**Value/Expression**^
|D       |Parameter|m<sup>2</sup> year<sup>-1</sup>|Diffusion coefficient|1                   |

<HTML><p></HTML>\\
<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Assign the same [[expression|expression]] to all the diffusion [[Transfer|Transfer]] blocks.<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>[[Running_simulations|Run a simulation]] and make a plot of //Flux_Out//. What has happened to the curve?<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Save the project.<HTML></p></HTML><HTML></li></HTML><HTML></ol></HTML>

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{{tutorial_7_6.png}}

**Solution to this part**

  * {{tutorial:Solution_transport_3.eco?linkonly}}

**Next**

  * [[Tutorial_7-Adding_Diffusion_to_the_Transport_Model|Adding Diffusion to the Transport Model (5/5)]]

**Previous**

  * [[Tutorial_7-Creating_a_Transport_model|Creating a Transport model]]

**References**

  * [[Tutorials|Back to Tutorials]]
  * [[start|Home]]
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