The Fracture boundary condition is included in the Transport of Diluted Species in Porous Media interface (see image) and has the same settings as in the Transport of Diluted Species in Fractures interface (described above). In cases where transport occurs in a fractured, porous 3D structure, the new Fracture boundary condition lets you model transport in the thin fractures without having to mesh them as 3D entities. Screenshot ansehen Fracture Surfaces in the Transport of Diluted Species in Porous Media Interface
Additionally, chemical reactions can be defined to occur within the fractures, at its surfaces, or in a porous medium that encompasses the fracture. Convective transport can be coupled to a Thin-Film Flow interface or through including your own equations to define fluid flow through the fracture. For the transport of the chemical species, the interface allows definition of effective diffusivity models to include the effects of porosity. The interface allows you to define the average fracture thickness, as well as the porosity in cases where the fracture is considered to be a porous structure.
The new Transport of Diluted Species in Fractures interface treats the fracture as a shell, where only the transverse dimensions are meshed as a surface mesh.
It is often difficult to model the transport of chemical species in such fractures through having to mesh the thickness of the fracture surface, due to the aspect ratios brought about by the large differences in size dimensions. Screenshot ansehen New Transport of Diluted Species in Fractures Interfaceįractures have thicknesses that are very small compared to their length and width dimensions.
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