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-   -   groovyBC + sinusoidial waves (http://www.cfd-online.com/Forums/openfoam-solving/92129-groovybc-sinusoidial-waves.html)

alexm September 3, 2011 01:21

groovyBC + sinusoidial waves
 
Hello togeher ...
maybe this ist a simple question, but nevertheless I am al little confused about and hope someone could help me.

I woluld like to use the groovyBC for the creation of a sinusoidial water wave ... and later for a standing wave ... first in 2dim.
At this point it is more or less a question for me of understanding, how to deal with this kind of boundaray conditition ...

Thanks in advance ...
Axel

gschaider September 5, 2011 05:48

Quote:

Originally Posted by alexm (Post 322722)
Hello togeher ...
maybe this ist a simple question, but nevertheless I am al little confused about and hope someone could help me.

I woluld like to use the groovyBC for the creation of a sinusoidial water wave ... and later for a standing wave ... first in 2dim.
At this point it is more or less a question for me of understanding, how to deal with this kind of boundaray conditition ...

Thanks in advance ...
Axel

You've got to be a bit more specific: what kind of waves? Accoustic? Water waves? ....

Basically write the boundary conditions down on a piece of paper. That is the difficult part. Implementing them in groovyBC ist pretty straightforward.

There is an example case groovyWaveTank floating around somewhere. I understand that it doesn't work with the latest versions of OF, but it might give you an idea

alexm September 11, 2011 03:11

Thanks for your answer. I would like to use the groovyBC for the generation of water waves in a wave tank.
I've found the "groovyWaveTank case" you mentioned and got it working for OpenFOAM 2.0.x. ... but I still have problems in understanding the syntax of the "value expression" part. Normaly at this point I reduce a problem to something I am more familiar with. So my idea of generating sinusoidial water wave with the groovyBC.

there seems to be three parts in the value expression " .... ? ... : ... " ... the first one seems to describe the wave as a scalar, the second as a vector .... standing for the propagation of the wave in each direction (?). But playing with this didn't bring me very far.

Any hint for me? Thanks again and have a nice weekend!

Greetings ... Axel

gschaider September 11, 2011 05:04

Quote:

Originally Posted by alexm (Post 323679)
Thanks for your answer. I would like to use the groovyBC for the generation of water waves in a wave tank.
I've found the "groovyWaveTank case" you mentioned and got it working for OpenFOAM 2.0.x. ... but I still have problems in understanding the syntax of the "value expression" part. Normaly at this point I reduce a problem to something I am more familiar with. So my idea of generating sinusoidial water wave with the groovyBC.

there seems to be three parts in the value expression " .... ? ... : ... " ... the first one seems to describe the wave as a scalar, the second as a vector .... standing for the propagation of the wave in each direction (?). But playing with this didn't bring me very far.

Any hint for me? Thanks again and have a nice weekend!

Greetings ... Axel

This is the conditional operator described in
http://openfoamwiki.net/index.php/Co...e_implemented:

Basically "a ? b : c" means "if a is true in a face then use b else use c"

alexm September 13, 2011 10:02

thanks for your help ...
this seems to be one more thing of the "I should have known" type ... :rolleyes:

gschaider September 14, 2011 04:46

Quote:

Originally Posted by alexm (Post 323954)
thanks for your help ...
this seems to be one more thing of the "I should have known" type ... :rolleyes:

I say to you what I say to everyone: the "documentation" on the Wiki is not sacrosanct. Should you have the feeling that this information is missing or too hard to find feel free to rewrite the relevant stuff


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