Boundary conditions in computational fluid dynamics: Difference between revisions

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{{Main|Boundary conditions in fluid dynamics}}

[[File:Fig 1 Formation of grid in cfd.JPG|thumb|Fig 1 Formation of grid in cfd]]Almost every [[computational fluid dynamics]] problem is defined under the limits of initial and boundary conditions. When constructing a staggered grid, it is common to implement boundary conditions by adding an extra node across the physical boundary. The nodes just outside the inlet of the system are used to assign the inlet conditions and the physical boundaries can coincide with the [[scalar control]] volume boundaries. This makes it possible to introduce the boundary conditions and achieve discrete equations for nodes near the boundaries with small modifications.

'''The most common boundary conditions used in [[computational fluid dynamics]] are'''

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<math> y^+ > 11.63\,</math>.

in the log-law region of a turbulent [[boundary layer]].

'''[[Laminar flow]]''' :

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These conditions are used when we don’t know the exact details of flow distribution but boundary values of pressure are known

For example: external flows around objects, internal flows with multiple outlets, [[buoyancy]]-driven flows, [[free surface]] flows, etc.

*The pressure corrections are taken zero at the nodes.

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[[Category:Computational fluid dynamics]]

[[Category:Boundary conditions|computational fluid dynamics in]]