[overture] Re: mast-sail

Hi Bill,

it's  clear to me that I can define multiple grids to move, my doubt is how 
overture evaluate the forces on shared grids.

Let us say the physical boundaries are given by

1)rod-grid
 __
|    |
|    |
|    |
|    |
*   *
*   *
*   *

and

2) stretched-cylinder-grid

          *   *
          *   *
          *   *
     -----     ------
    |                |
    |                |
    | ________ |

 (my best cylinder in ASCII...)

where I've indicated with * the shared boundaries and with lines - | _  the 
unshared ones. 

The the whole grid I move by saying 
"moving grids... specify grids... stretched-cylinder-grid and rod-grid"
 is given by

1+2)
           __
          |    |
         
|    |
         
|    |
         
|    |
          *   *

          *   *

          *   *
     -----     ------

    |                |

    |                |

    | ________ |


and this is ok, the shared boundaries have been superimposed.

In the MovingGridsClass I read that the program iterates on each point of each 
sub-grid to evaluate the fluid forces/torque on the body 

{ 
...
(for b=0, b<body, b++) 
integrate(I1,I2,I3,f)
...
}

Are not then the shared points * counted twice in this way, one for each 
sub-grid? Or, if there's a routine in the shared configuration that avoid this, 
where is located in the code?

Thanks!

Alessandro





On 04/25/2012 12:34 AM, 
Hi Alessandro,

    

    On 04/25/2012 03:50 AM, Alessandro Orchini wrote:
    
      
      
        Hi all,

        

        I want to generate a grid similar to the 2d mast-sail grid in
        the examples, and then make this grid move under the
        RigidBodyMotion class.

        

        I noticed that actually in this way I build up 2 separate
        physical boundaries ("sail-grid" and "stretched-mast-grid" in
        the sampleGrids), that are connected sharing a part of the
        boundary.

        

        I wonder if is then possible to run this grid under the
        RigidBodyMotion Class:

        

        Which grid(s) should I move?

        If both of them, does the shared boundary option take into
        account that part of the sail is included in two different grids
        when computing fluid-dynamic forces on the whole body?

      
    
    

    This should work. After defining the type of motion you can choose
    multiple grids to move. The forces

    will be computed on the entire body.

    


    ...Bill

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