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Fig. 2 | Fluids and Barriers of the CNS

Fig. 2

From: Arterial vasodilation drives convective fluid flow in the brain: a poroelastic model

Fig. 2

Geometry, boundary conditions and discretization of the model. a. The geometry of the model showing the two domains, with the dimensions and boundary conditions. Solid displacement and fluid velocity were prescribed at the red- and cream-colored surfaces. Pressure-like tractions were prescribed on the green- and blue-colored surfaces. Flow resistance (Robin) boundary conditions were prescribed on the purple-colored surface. Symmetry boundary conditions were prescribed on all other surfaces. b. Tetrahedral mesh used for the finite element model. A fine mesh, with elements of \(2 \,\upmu \mathrm{m}\) were used near the regions where no-slip boundary conditions were prescribed and at the interface between the two domains. The mesh size was gradually increased to \(10\,\upmu\mathrm{m}\). c The fluid flow in the SAS at the baseline state, which is a result of the pressure difference applied across the ends (green- and blue-colored surfaces in a)

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