page_title: Boundary conditions in computational fluid dynamics
section_title: Intake boundary conditions
hierarchical_section_title: Boundary conditions in computational fluid dynamics / Intake boundary conditions
caption_attribution_description: English: pressure correction cell at intake 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: Consider the case of an inlet perpendicular to the x direction. 
  For the first u, v, φ-cell all links to neighboring nodes are active, so there is no need of any modifications to discretion equations.
  At one of the inlet node absolute pressure is fixed and made pressure correction to zero at that node.
  Generally computational fluid dynamics codes estimate k and ε with approximate formulate based on turbulent intensity between 1 and 6% and length scale
caption: Fig.4 pressure correction cell at intake boundary
exif: {"Image Artist": "akshar", "Image ExifOffset": "2130", "Image XPAuthor": "akshar", "Image Padding": "[]", "EXIF DateTimeOriginal": "2012:12:07 15:49:06", "EXIF DateTimeDigitized": "2012:12:07 15:49:06", "EXIF SubSecTimeOriginal": "04", "EXIF SubSecTimeDigitized": "04", "EXIF Padding": "[]"}