[firedrake] Enforcing slip boundary condition strongly

[Colin Cotter]

Justin is wanting to enforce the flux condition, he said. That's the normal
component.

--cjc

On 10 July 2015 at 10:25, David Ham <David.Ham at imperial.ac.uk> wrote:

> Hi Colin,
>
> That does not appear to be what Justin is asking for. He is asking how to
> set a Dirichlet condition on one component of a VectorFunctionSpace. I'm
> not sure we can do that right now, but I think this should be fixable. I
> want to check what the Dolfin syntax for this is (so we maintain
> compatibility) and then try to fix it. (Of course someone might want to
> pleasantly surprise me and tell me we can do this already!)
>
> David
>
> On Fri, 10 Jul 2015 at 10:14 Cotter, Colin J <colin.cotter at imperial.ac.uk>
> wrote:
>
>>   Hi Justin,
>>    Just to be clear, are you talking about enforcing normal component of
>> the vector RT0 quantity to be zero?
>>
>>  all the best
>>  --cjc
>>
>> On 9 July 2015 at 21:28, Justin Chang <jychang48 at gmail.com> wrote:
>>
>>> Hi everyone,
>>>
>>> I am solving a mixed poisson (aka: Darcy) problem using the VMS
>>> formalism (Masud and Hughes, CMAME, 2002) which enables one to use equal
>>> order lagrangian interpolation. In this formulation, the flux/velocity is
>>> prescribed strongly and the pressure is prescribed weakly, like how it's
>>> done with RT0 elements.
>>>
>>> The main difference is that velocity is now a VectorFunctionSpace as
>>> opposed to a FunctionSpace. My question is, how would I implement the flux
>>> boundary condition in a Dirichlet sense? Say I am working with a unit
>>> square for now. I want to enforce v_x = some value(s) for x=0/x=1, and v_y
>>> - some values(s) for y = 0/y = 1. How would this be done in Firedrake?
>>>
>>>  Thanks,
>>> Justin
>>>
>>> _______________________________________________
>>> firedrake mailing list
>>> firedrake at imperial.ac.uk
>>> https://mailman.ic.ac.uk/mailman/listinfo/firedrake
>>>
>>>
>>
>>
>> --
>>  http://www.imperial.ac.uk/people/colin.cotter
>>
>> www.cambridge.org/9781107663916
>>
>>
>>
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-- 
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www.cambridge.org/9781107663916
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