Re: [fds-smv] FDS Multiple meshes

[Barbro Maria Storm]

2011/5/13 tims <veerama...@gmail.com>:
> Hi,
>
> I have two adjacent rooms of unequal dimensions:
> (smaller) 8.5 x 9.1 x 3.0 and
> (bigger) 8.6 x 9.1 x 9.1.
>
> Cells for th smaller one: 85, 85, 30 (size 0.1 x 0.12 x 0.1)
> Cells for the bigger one: 85, 90, 90 (size 0.1 x 0.1 x 0.1)
>

Wild suggestion:

Cells for th smaller one: 85, 91, 30 (size 0.1 x 0.1 x 0.1)
Cells for the bigger one: 86, 91, 91 (size 0.1 x 0.1 x 0.1)

--
Barbro Storm

[Goodwihne]

This is nice tool:

http://www.koverholt.com/fds-mesh-size-calc/

---
Goodwihne

On May 14, 10:44 am, Barbro Maria Storm <bar...@gmail.com> wrote:
> 2011/5/13 tims <veeramany.a...@gmail.com>:

[dr_jfloyd]

adjacent grids must line up with one another (see the user's guide for
examples). This error means that is not the case with your inputs.
Change your XB and/or your IJK so that the grids line up.

On May 16, 9:05 am, tims <veeramany.a...@gmail.com> wrote:
> Thanks for the tool Goodwihne.
>
> Despite using the tool, I get the following error:
>
> Error: MESH 1 is out of alignment with MESH 2
> STOP: FDS improperly set-up.
>
> Any leads?
>
> Thanks.

> > > Barbro Storm- Hide quoted text -
>
> > - Show quoted text -
>
>

[dr_jfloyd]

If you are getting that error message, then the meshes do not line
up. Check your inputs carefully.

On May 16, 9:40 am, tims <veeramany.a...@gmail.com> wrote:
> Thanks, but then, both meshes are adjacent and lined up on the x &
> along the y axis:

>
> (smaller) 8.5 x 9.1 x 3.0 and

> (bigger) 8.5 x 9.1 x 9.1.
>
> Any ideas?
>
> Thanks

> > > > - Show quoted text -- Hide quoted text -

[Dave McGill]

The mis-alignment may be easier to spot visually. A Smokeview file
should have been created. Open it, turn on all the grids and zoom into
the area of the interface. You should be able to see the mis-aligned
grid-lines.

Dave

On May 16, 9:40 am, tims <veeramany.a...@gmail.com> wrote:
> Thanks, but then, both meshes are adjacent and lined up on the x &
> along the y axis:
>

> (smaller) 8.5 x 9.1 x 3.0 and

> (bigger) 8.5 x 9.1 x 9.1.
>
> Any ideas?
>
> Thanks
>
> On May 16, 9:29 am, dr_jfloyd <drjfl...@gmail.com> wrote:
>
>
>
>
>
>
>

> > > > - Show quoted text -- Hide quoted text -

[dr_jfloyd]

So you checked x,y, and z and determined that the cells aligned?

9.1 / 27 = 0.337037
3.0 / 27 = 0.111111

These are not integer multiples.
Your meshes do not align.
Hence you get the error message.

On May 16, 2:24 pm, tims <veeramany.a...@gmail.com> wrote:
> Cells seem to align well - two cells of smaller mesh match exactly
> with one cell of the larger one:
>
> larger cell size: 0.32 x 0.30 x 0.34
> smaller cell size: 0.16 x 0.15 x 0.17
>
> mesh boundary(m):
> larger: (8.5, 17.1), (0, 9.1), (0, 9.1)
> smaller: (0,8.5), (0,9.1), (0.3.0)
>
> x,y,z cells:  27, 30, 27
>
> any help? thanks

[Kevin]

You may have to change some dimensions to ensure that the grids line
up exactly. The solid obstructions will be adjusted to conform to the
mesh. The meshes are not altered.

On May 17, 9:35 am, tims <veeramany.a...@gmail.com> wrote:
> Is it at all possible to align all mesh and room boundaries in a
> multiple mesh geometry?
> Thanks