Couples problems of different or equal dimension that touch at the domain boundary. Examples are equal-dimension multi-physics problems like Darcy-Stokes coupling or PNM (pore network model)-Darcy coupling.
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| Image | Example description | Topics | Comment |
 | Two porous media are coupled at touching boundaries. This scheme is already implemented for coupling two single-phase Darcy models 1p_1p as well as coupling a single-phase Darcy model to a two-phase Darcy model 1p_2p. | Porous medium flow (Darcy), Two-point flux approximation (Tpfa), 1p, 2p, 2D-2D | - |
 | A free flow model and a pore network model are coupled. This scheme is already implemented for coupling a single-phase Navier-Stokes model and pore network model 1p_1p and also for coupling two one-phase two-component models 1p2c_1p2c. These tests also cover non-isothermal models. | Navier-Stokes, Pore network, Pore-network Models, Staggered FV scheme, 1p, 1pnc, non-isothermal, 1D-2D | - |
| | A porous medium is coupled to a freeflow domain. Concrete implementations are available for coupling a single-phase Navier-Stokes model to a single-phase Darcy model 1p_1p. Additionally, there are tests for coupling single-phase Stokes and Darcy models 1p_1p, single-phase and two-phase models respectively 1p_2p. For varying numbers of phases and components, see 1p2c_1p2c, 1p2c_2p2c and 1p3c_1p3c. | Porous medium flow (Darcy), Navier-Stokes, Two-point flux approximation (Tpfa), Staggered FV scheme, 1p, 2p, 1pnc, 2p2c, 2D-2D | - |
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