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[Gideon Simpson <grs2103@xxxxxxxxxxxx>]

Related question for both incompressible flow and elasticity  
problems.  Suppose I have a plane of symmetry that will allow me to  
reduce my computational domain.  If

\sigma_ij

is the relevant stress tensor, then I will have that

t^k_i \sigma_ij n_j = 0

where t^k is the k-th tangential vector of the local geometry.   
Physically, this is vanishing shear stress.  This is in addition to  
the condition

u_i n_i = 0

for no normal flow (the slip condition).

Any thoughts on implementing the vanishing shear stress condition?

-gideon

On Jan 14, 2008, at 2:57 PM, Murtazo Nazarov wrote:

> > Is there an obvious high level way to implement normal flow type
> > boundary conditions or symmetry type boundary conditions?
> >
> > -gideon
>
> If you mean slip boundary condition which for normal velocity, it is
> already implemented and soon will be available with UNICORN.
>
> The slip with friction is also implemented.
>
> /murtazo
>
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