dolfin team mailing list archive

["Murtazo Nazarov" <murtazo@xxxxxxxxxxx>]

> 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

Ones you have tangential and normal vectors, you can include this as a
boundary term to the ffc form?

>
> 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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>>
>>
>
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