[Mike_star]

I was thinking how inletOutlet and outletInlet would work if I had a single circular (assume 2D) boundary and applied this conditon to it.

U:
circularboundary
{
type inletOutlet;
inletValue uniform (5 0 0);
value uniform (0 0 0);
}

p:
circularboundary
{
type outletInlet;
outletValue uniform 0;
value uniform 0;
}

So I would have a fixed velocity on some "inlet" cells and zero gradient on "outlet" cells; and fixed pressure some "outlet" cells and zero gradient on some "inlet" cells?
Does anyone know whether this BC is applied piecewise to each cell face or to the entire boundary as a whole?
(original post: http://www.cfd-online.com/Forums/ope...plication.html)

[pupo]

I am not sure what you mean with " single circular (assume 2D) boundary" but, the inletoutlet condition It is applied individually to each cell.


For example:

U:
Outlet
{
      type inletOutlet;
      inletValue uniform (0 0 0);
      value uniform (0 0 0);  // this is just a start value
}

would apply a zeroGradient Velocity condition if the flow is going OUT of the domain, and a zero velocity condition if the flow is going IN to the domain. Like shown in this image:



I am not sure if applying an outlet/inlet condition for pressure is even correct at all. But if someone knows, I'd like to know :P

[Mike_star]

Awesome. Thanks for your reply. Now my main question is that if the following code can mimic inletOutlet BC you mentioned in the post:
outlet
{
type groovyBC;
valueExpression "vector(0,0,0)";
gradientExpression "vector(0,0,0)";
fractionExpression "(phi > 0) ? 0 : 1";
value uniform (0 0 0);
}
In other words, is groovyBC also applied individually on each cell?

Thank you!

[pupo]

I haven't used groovy in ages so i can't vouch for the syntax. However, if memory serves me right, yes, groovyBC conditions are applied on a "per cell" basis and nor for the entire patch.