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-   -   where does wall boundary condition is defined? (http://www.cfd-online.com/Forums/openfoam-solving/112170-where-does-wall-boundary-condition-defined.html)

immortality January 23, 2013 05:36
where does wall boundary condition is defined?
 
i cant find wall BC in src.where it is defined?
I want to see how its impermeability is defined.
Thanks.

ngj January 23, 2013 05:42
Ehsan,

Wall is not a boundary condition, but an attribute to the patch. Please read the third paragraph in my previous post to you again:

http://www.cfd-online.com/Forums/ope...tml#post403260

A patch with the attribute "patch" can easily act as a wall, if you give noslip on velocity and zeroGradient on the pressure.

Furthermore, you keep posting similar questions in a lot of new threads. This will only results in a lot less searchable forum, so please modify your behaviour.

Kind regards,

Niels

immortality January 23, 2013 06:37
how can use a property at a point in groovyBC?
 
i want to use value of pressure at a point to set a boundary condition.more clear i need to set a p0,T0 boundary condition when shock is reached at the end of the channel.what command shouldp i use at fractionExpression?


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