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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. Define the reaction intervals. Specify what fluids flow into the domain, and when. Inlet fluid “contaminated” enters the domain from t = 0 to 2 years. Inlet fluid “flush” 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

  2. Define the reaction intervals. Specify what fluids flow into the domain, and when. Inlet fluid “contaminated” enters the domain from t = 0 to 2 years Inlet fluid “flush” enters the domain from t = 2 to 10 years Click to add a new reaction interval

  3. The various inlet fluids are defined on the Fluids pane Inlet fluid named “contaminated” carries Pb++pulse into the domain Clean rinse water: negligible Pb++in the “flush” inlet fluid Click to add a new fluid

  4. Specify domain size and gridding on the Domain pane. Domain is 1 km long, divided into 400 nodal blocks

  5. Specify flow rate on the Flowpane. Set flowrate for 1st and 2nd reaction intervals individually, or set one flowrate for all intervals Set specific discharge or hydraulic head/ potential drop

  6. Set various mass transport and thermal properties on the Medium pane. X1t and X2t account for mass transport by advection, hydrodynamic dispersion, and molecular diffusion… … and heat transfer by advection and conduction. Run → Go traces the model

  7. Pb++pulse transported through the domain by advection, dispersion, and diffusion.

  8. Hot water is injected into the domain’s inlet. Heat transported by advection and conduction.

  9. 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 Diffusion coefficient, thermal conductivity, porosity of stagnant zone default to free-flowing values unless you set them here.

  10. 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.

  11. Fluid composition, temperature, medium properties, and more can be set to vary in space. Random field Porosity varies about a mean of 30% with a standard deviation of 5%. Click + to set heterogeneous values using random fields, tables, equations, scripts, or functions.

  12. Porosity has been set as a random variable.

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