where does wall boundary condition is defined?

immortality · January 23, 2013, 06:36

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, 06:42

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, 07:37

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?

January 23, 2013, 06:36	where does wall boundary condition is defined?	#1
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 27	i cant find wall BC in src.where it is defined? I want to see how its impermeability is defined. Thanks.

January 23, 2013, 07:37	how can use a property at a point in groovyBC?	#3
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 27	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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January 23, 2013, 06:42		#2
ngj Senior Member Niels Gjoel Jacobsen Join Date: Mar 2009 Location: Copenhagen, Denmark Posts: 1,903 Rep Power: 37	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