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Specify domain’s starting fluid composition on the Initial pane

Specify domain’s starting fluid composition on the Initial pane. Clean water. Start and end times of two reaction intervals. Inlet fluid enters the domain from t = 0 to 2 years. Inlet fluid carries Pb ++ pulse into the domain. Inlet 2 fluid enters the domain from t = 2 to 10 years.

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Specify domain’s starting fluid composition on the Initial pane

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  1. Specify domain’s starting fluid composition on the Initial pane Clean water Start and end times of two reaction intervals

  2. Inlet fluid enters the domain from t = 0 to 2 years Inlet fluid carries Pb++pulse into the domain

  3. Inlet 2 fluid enters the domain from t = 2 to 10 years Clean rinse water: negligible Pb++in the second inlet fluid

  4. Specify domain size, gridding, and flow rate on the Domain pane. Domain is 1 km long, divided into 400 nodal blocks Set flowrate for 1st and 2nd reaction intervals Set specific discharge or head drop

  5. Set various mass transport properties on the Medium pane. Porosity of the free-flowing zone. Used to calculate coefficient of hydrodynamic dispersion.

  6. In a dual porosity model, each nodal block is divided into a free-flowing zone and a stagnant zone. Config → Dual Porosity… On/off toggle 40% of the aquifer is stagnant. Characteristic dimension of the stagnant zone Run → Go traces the model

  7. Pb++travels from one nodal block to another only through the free-flowing volume, but it can diffuse into and out of the stagnant zones.

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