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====== Tutorial 7 - Adding Diffusion to the Transport Model ======

===== 5/5 =====

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**Creating the model structure**

  - Open the second model again.
  - Connect //Begin// and //End// with a [[Transfer|Transfer]] block. Name the block “Diffusion_Down”.
  - Connect //End// and //Begin// with a [[Transfer|Transfer]] block. Name the block “Diffusion_Up”.
  - Connect //End// and //Out// with a [[Transfer|Transfer]] block. Name the block “Diffusion_Out”.

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{{tutorial_7_7.png?600}}
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**Assigning values**

<HTML><ol></HTML>
<HTML><li></HTML><HTML><p></HTML>Edit //Diffusion_Down//. Enter the same expression “D/(R * dx<sup>2</sup>)”, where //D// has the same properties as in the previous model:<HTML></p></HTML>
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<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 to //Diffusion_Up// and //Diffusion_Out//.<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>[[Running_simulations|Run a simulation]] and make a plot of //Flux_Out//. Do you get the same result as in the [[Compartment|Compartment]] model?<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>[[Running_simulations|Run simulations]] with different values for //N//. How many discretizations are needed to make the curve converge?<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Change the Advection Velocity //v// to 10 m year<sup>-1</sup>. As the total depth of the media is 10m, the [[transport|transport]] should now occur in a much shorter time span than before. Change the end time of the simulation to a lower value, say 3 years.\\
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How many discretizations are now needed to make the curve converge?<HTML></p></HTML><HTML></li></HTML><HTML></ol></HTML>

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**Solution to the excersise**

  * {{solution_transport_4.eco}}

**Previous**

  * [[Tutorial_7-Adding_diffusion_to_the_compartment_model|Adding diffusion to the compartment model (4/5)]]

**Reference**

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