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-   -   any boundary type that allows points floating on a line? (http://www.cfd-online.com/Forums/pointwise/129099-any-boundary-type-allows-points-floating-line.html)

lakeat January 28, 2014 14:58

any boundary type that allows points floating on a line?
 
Dear all,

When I try to smooth the mesh with elliptic smoother, I cannot find any boundary type that allows the points to move in a line. The type is either fixed or floating, but what I want is only let the points float in the line? Any ideas?

For example, say I have a two-block mesh, they are 1254 and 2365
1-2-3
| | |
4-5-6

Now, points 1,2,3 are in the same line. As I smooth the mesh, I hope point 2 can be freely moved, but it should always stay in the line, so are all the grid points on line 12 and line 23.

cnsidero January 29, 2014 11:14

Daniel,

The orthogonal BC is what you want to use on edges that you want the points to slide along the connector without changing the connectors shape.

Note, however, the ends of connectors, aka nodes, will not move. Only the internal points. If you really need point 2 to move, you will have to join the two domains then join the two connectors which share point 2.

-Chris

Quote:

Originally Posted by lakeat (Post 472191)
Dear all,

When I try to smooth the mesh with elliptic smoother, I cannot find any boundary type that allows the points to move in a line. The type is either fixed or floating, but what I want is only let the points float in the line? Any ideas?

For example, say I have a two-block mesh, they are 1254 and 2365
1-2-3
| | |
4-5-6

Now, points 1,2,3 are in the same line. As I smooth the mesh, I hope point 2 can be freely moved, but it should always stay in the line, so are all the grid points on line 12 and line 23.


lakeat January 29, 2014 11:24

I see, thank you! Then why not call it restricted-floating or on-boundary-floating or something. :) (I guess that even the "fixed" b.c. also will enforce an orthogonal grid on the b.c, right?)

cnsidero January 29, 2014 12:07

I don't write the software, I just explain how to use it ;-)

Quote:

Originally Posted by lakeat (Post 472353)
I see, thank you! Then why not call it restricted-floating or on-boundary-floating or something. :) (I guess that even the "fixed" b.c. also will enforce an orthogonal grid on the b.c, right?)


tcarrigan January 29, 2014 16:35

Quote:

Originally Posted by lakeat (Post 472353)
I see, thank you! Then why not call it restricted-floating or on-boundary-floating or something. :) (I guess that even the "fixed" b.c. also will enforce an orthogonal grid on the b.c, right?)

The Fixed boundary condition would enforce an orthogonal grid at the boundary assuming the Angle Controls were set to Orthogonal.

The Angle Controls and Boundary Conditions accomplish two separate tasks. Setting the Boundary Condition to orthogonal allows the points to slide along the boundary to achieve orthogonality while the setting the Angle Control to orthogonal would bend the grid lines coming off the boundary to achieve orthogonality, a distance controlled by specifying the Blending and Decay Factor.


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