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Periodic Vs symmetry Boundary conditions

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Old   June 6, 2013, 13:46
Default Periodic Vs symmetry Boundary conditions
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Candy
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Hello,
I would like to know the difference between periodic and symmetry boundary conditions?
Thanks,
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Old   June 6, 2013, 15:19
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Periodicity means that the thing or part is repeating itself.
Eg: You can take single blade of a turbine runner and apply periodicity.

Symmetry type boundary condition is applied if the geometry is exactly same about a plane. Ex: If you cut any body into exact half and place that body in front of a mirror, you are able to visualise the complete picture of the body.
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Old   June 6, 2013, 20:25
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Glenn Horrocks
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You really should understand the mathematical basis of these boundary conditions. Read any CFD textbook for a description of this in detail, but in short a symmetry boundary has zero normal gradient for all variables except the normal velocity which is zero; and a periodic boundary just maps the values from one boundary across to another.
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Old   June 7, 2013, 01:02
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Quote:
Originally Posted by vishal.indomitable View Post
Periodicity means that the thing or part is repeating itself.
Eg: You can take single blade of a turbine runner and apply periodicity.

Symmetry type boundary condition is applied if the geometry is exactly same about a plane. Ex: If you cut any body into exact half and place that body in front of a mirror, you are able to visualise the complete picture of the body.
Vishal, both geometry and flow should be symmetric for symmetric boundary condition to be fully valid.
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