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Salt intrusion from top

Salt intrusion from top. Vertical cross section. Spatial Discretization. FEFLOW Mesh Generation. Height approx. 100 m. • Automatic mesh generation (~3000 triangular elements) • Mesh refinement (via Rubberbox and Border Options). Model Set-up. FEFLOW Basic Settings.

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Salt intrusion from top

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  1. Salt intrusion from top Vertical cross section

  2. Spatial Discretization FEFLOW Mesh Generation Height approx. 100 m •Automatic mesh generation (~3000 triangular elements)• Mesh refinement (via Rubberbox and Border Options)

  3. Model Set-up FEFLOW Basic Settings •2D (default) •Problem Class: Flow and Mass (steady flow, transient transport)•Vertical problem projection•Temporal and control data:Automatic time stepping, FE/BE time integrationFinal time: 36500 days (100 years)

  4. Model Set-up Flow Problem - Material parameters •Global: Density ratioa= 10-3 Input 10[10-4]

  5. Model Set-up Flow Problem - Boundary Conditions •Impermeable border (default)•1st-kind boundary condition at an arbitrary node, e.g., upper left: h = 0 m

  6. Model Set-up Mass-Transport Problem - Boundary Conditions Concentration at the spill site: 100 mg/l Implemented as 1st-kind boundary condition in the center section of the upper border (via Border-Option) •C = 100 mg/l

  7. Numerical Solution FEFLOW Options •Direct equation solver

  8. Numerical Solution FEFLOW Ergebnis Free convection

  9. Base model – Save…

  10. Model Extension Flow Problem - Boundary Conditions Horizontal hydraulic gradient (‘strong’) Implemented as 1st-kind boundary condition along the left and right vertical borders(via Border-Option): •left side: h = 0 m•right side: h = 0.1 m

  11. Numerical Solution FEFLOW Result Flow is dominated by forced horizontal convection

  12. Model Modification Flow Problem - Boundary Conditions Horizontal hydraulic gradient (‘weak’) Reducing the boundary-condition value on the right vertical border (via Debug option): •right side: h = 0.01 m

  13. Numerical Solution FEFLOW Result Combined effects of free and forced convection

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