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====== Tutorial 7 - Creating a Transport model ======

===== 3/5 =====

You will now try to replicate the results from the [[Compartment|Compartment]] model with a [[Transport|Transport]] block. As the equations and parameters are the same, you can re-use the previous model.

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**Creating the model structure**

<HTML><ol></HTML>
<HTML><li></HTML><HTML><p></HTML>Save the previous project with a new name.<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Create a [[Transport|Transport]] block by right-clicking in the [[Blocks_window|Blocks window]] and choosing **Create | Transport**.<HTML></p></HTML><HTML></li></HTML>

<HTML><li></HTML><HTML><p></HTML>Expand the [[Transport|Transport]] block.<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Copy [[Transfer|Transfer]] block with name Input and past so that it connects //Source// with //Begin//. You can do this either by dragging the block directly in the matrix to its new position, or by editing the block and changing the target property from //Layer_1// to //Begin//.<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Copy the [[Transfer|Transfer]] block //Advection_1_2// and past so that it connects //Begin// with //End//. **Edit** the block and rename it to “Advection”.<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Copy the [[Transfer|Transfer]] block //Advection_3_Out// and past so that it connects //End// with //Out//. **Edit** the block and rename it to “Advection_Out”.<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Create one more [[Expression|Expression]], name it Flux_Out_2 and fill equation field with //End*Advection_Out//.<HTML></p></HTML>
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<HTML></p></HTML>
<HTML><p></HTML>{{tutorial_7_4.png}}<HTML></p></HTML>
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<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>The number of discretizations is now determined by the built-in block //Transport.N//.<HTML></p></HTML><HTML></li></HTML><HTML></ol></HTML>

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**Assigning values**

  - Edit Transport.N. Change the value to “3”.
  - [[Running_simulations|Run a simulation]]. Do you get the same results as with the classic [[compartment|compartment]] model? Compare //Flux_out// and //Flux_out_2//.
  - Try to run simulations and vary the value of //N//. What happens? Why?
  - Save the project.

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**Solution to this part**

  * {{tutorial:Solution_transport_2.eco?linkonly}}

**Next**

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

**Previous**

  * [[Tutorial_7-Creating_a_transport_the_old_fashioned_way|Creating a transport the old fashioned way (2/5)]]

**References**

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