[aspect-devel] Velocity Boundary conditions

[John Naliboff]

Hi Felipe,

In your function you would need to set values for all three components, 
but in the "Model settings subsection" you specify what components of 
the velocity are applied to each boundary under "Prescribed velocity 
boundary indicators".

For example, if you want the function to only apply to the "x" velocity 
component you would write:
   set Prescribed velocity boundary indicators = left x: function, ....

The "y" and "z" components of the velocity field are then not fixed 
along this boundary (i.e. parallel to the boundary is free-slip).

A full description of this is located in the "Prescribed velocity 
boundary indicators" section in the output parameter file or in 
source/simulator/parameters.cc.

Cheers,
John

*************************************************
John Naliboff
Assistant Project Scientist, CIG
Earth & Planetary Sciences Dept., UC Davis

On 06/02/2017 03:04 PM, FELIPE ORELLANA ROVIROSA wrote:
>
>  Hi Wolfgang,
>
>      Wow, I am amazed. So, that means that I should prescribe two 
> components and leave the third in omission.
>
> for a wall with normal vector z
>
>       Vx =0 , Vy=0
>
>
> how to write this in the parameter file?
>
> Set them as prescribed velocities? and then prescribe just two components?
>
> subsection Boundary velocity model
>   subsection Function
>     set Variable names      = x,y
>     set Function expression = 0 ; 0 ;
>  end
> end
>
> ??
>
> Felipe
>
> On Fri, Jun 2, 2017 at 2:26 PM, Wolfgang Bangerth <bangerth at tamu.edu 
> <mailto:bangerth at tamu.edu>> wrote:
>
>     On 06/02/2017 03:17 PM, FELIPE ORELLANA ROVIROSA wrote:
>
>
>                 At a wall boundary, is it possible to prescribe 2
>         components of the velocity (for example to 0 in particular for
>         my case), and leave the 3rd free?
>
>
>     Only if those two are the two tangential components of the velocity.
>
>     Best
>      W.
>
>     -- 
>     ------------------------------------------------------------------------
>     Wolfgang Bangerth          email: bangerth at colostate.edu
>     <mailto:bangerth at colostate.edu>
>                                www:
>     http://www.math.colostate.edu/~bangerth/
>     <http://www.math.colostate.edu/%7Ebangerth/>
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