Symmetry Boundary Condition

Numerical methods and mathematical models of Elmer
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selim
Posts: 14
Joined: 02 Sep 2009, 14:17

Symmetry Boundary Condition

Post by selim »

Hi,
I have to implement a symmetric BC.
At the line of symmetry partial(variables)/partial(normal)=0

In the ElmerGUI or ElmerFront, I dont see this options. :?
I looked at the model.emf (something related to symmetry; SYMMETRY_SIDE=FALSE)

I used this in model.sif as Symmetry Side=True
No success

How can use this option? :roll:

Kind regards,
Selim
raback
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Re: Symmetry Boundary Condition

Post by raback »

The symmetry condition is often also the natural condition sometimes also called "do nothing" condition. This is the case for Poisson type of equations, for example. Therefore there most often is no option in the GUI for this either. For Navier-Stokes you typically have to set the normal velocity to zero. This is done similarly as any other Dirichlet condition for velocity.

BR, Peter
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