2D Component
Now solve the space and time-dependent transport and reaction of solutes. For this purpose, the required interfaces are added. Note that the first study solved the coupled ODEs that describe the reactions. A new Study will be used for the coupled transport system.
5
In the Home toolbar click Add Physics . You can also right-click Component 1  in the Model Builder and choose Add Physics .
6
Go to the Add Physics window. In the Physics tree, under Fluid Flow > Porous Media and Subsurface Flow, select Richards’ Equations (dl) . Find the Physics interfaces in study section immediately below the tree (scroll down if necessary), and clear the Solve checkbox for this physics interface in Study 1.
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Click Add to Component 1 .
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In the Physics tree, under Chemical Species Transport, click Transport of Diluted Species in Porous Media (tds) . Find the Physics interfaces in study section and clear the Solve checkbox to deactivate this physics interface in Study 1.
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Click to expand the Dependent variables section immediately below the Physics interfaces in study section. In the Number of species text field, type 3. Change the default names to c_a, c_asx, and c_asn.
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Click the Add to Component 1  button.
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In the Home toolbar click Add Physics  to close the Add Physics window.
Next, add a new time-dependent study for solving the recently added interfaces.
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In the Home toolbar click Add Study .
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Go to the Add Study window and find the Studies section. In the tree under General Studies select Time Dependent .
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Go to the Physics interfaces in study section and clear the Solve checkbox for the Global ODEs and DAEs (ge)  interface.
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Click the Add Study button
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In the Home toolbar click Add Study  to close the Add Study window.