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-   -   How did I set two kind of slope in channel ? (http://www.cfd-online.com/Forums/flow-3d/27355-how-did-i-set-two-kind-slope-channel.html)

Marco March 2, 2009 21:21

How did I set two kind of slope in channel ?
 
Dear Experts :

If I want to set a slope in channel. I can set gravity component in the X-direction. But I will set two kind of slope now. Besides uses Auto CAD to construct the slope. Did there have any methods to solve?

Another question. If I construct a Geometric model. On side wall's boundary condition whether to need to set "wall boundary"?

Thanks your help!

MC March 3, 2009 19:15

Re: How did I set two kind of slope in channel ?
 
What do you mean you will have two slopes? Will they be in different directions or just different parts of the geometry?

The main difference between a wall and a symmetry boundary is there is no friction at the symmetry boundary. So if you have heat applied to the wall or if you are interested in viscous stress along the wall then you would use the wall boundary.

Marco March 3, 2009 21:45

Re: How did I set two kind of slope in channel ?
 
Thanks MC~

Yes, I mean that have a channel but there have two kind of slopes(that is upstream slope is 1 degree downstream slope is 5 degree). How did I set two kind of slopes, I don't want to use Auto CAD to draw slopes of channel.

Thanks your help!

MC March 4, 2009 11:37

Re: How did I set two kind of slope in channel ?
 
I think either way you will have to use AutoCAD unless your channel is simple geometry then you could create it in FLOW-3D and rotate it to the angled slope. :)

Marco March 5, 2009 05:25

Re: How did I set two kind of slope in channel ?
 
Very thanks your help, MC.

Armen A. Ghirghidov March 5, 2009 07:21

Re: How did I set two kind of slope in channel ?
 
There is another problem with slope channel - mesh roughness (as we call it). If you rotate your channel in AutoCAD you will get roughness due to vertical orthogonal cubic mesh. That is the problem. I used component of gravity.

Regards.


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