page_title: Boundary conditions in computational fluid dynamics
section_title: Pressure boundary condition
hierarchical_section_title: Boundary conditions in computational fluid dynamics / Pressure boundary condition
caption_attribution_description: English: p’-cell at an exit boundary
context_page_description: 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
  Intake conditions
  Symmetry conditions
  Physical boundary conditions
  Cyclic conditions
  Pressure conditions
  Exit conditions
context_section_description: 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.
caption: Fig. 11 p’-cell at an exit boundary
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