[overture] Re: mast-sail
- From: Alessandro Orchini <aorchini@xxxxxxxxxx>
- To: <overture@xxxxxxxxxxxxx>
- Date: Thu, 3 May 2012 11:02:05 +0200
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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