GiD forum

hi,
i have to generate a structured mesh for a cfd-simulation of a tunnel. the tunnel is filled with cars, represented of cubes. to generate the structured mesh i have to subdivide the inside volume of the tunnel into seperated volumes. do i have to subdivede them manual or is there a function in GiD, which can do this.
i have the fundamental problem that the generation of the mesh with two seperated volumes does not works like i want.
for example:
two boxes, one big and one small.
the small box is inside the big one. when i generate a structured mesh of both volumes, there is no relationship between the both meshes. i want that the boundary nodes of the small volume be part of the mesh of the big volume. how can i reach this??

thanks for your helpv
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The volumes do not have to be independent, must share the faces.
To mesh structured, is required manually subdivide the geometry to create 4-sided surfaces (2D) or 6-faces volumes (3D).


For example, see this picture of the division required to mesh a structured 2D tunnel. This 2D surfaces can be extruded to create a 3D structured geometry.
For structured surfaces GiD only require surfaces with "topologically" 4 faces, but for structured volumes GiD requires "exactly" 6 faces.



----- Original Message -----
From: Lars Künnemann
To: Gidlist
Sent: Saturday, November 10, 2001 5:09 PM
Subject: [GiDlist] (no subject)


hi,
i have to generate a structured mesh for a cfd-simulation of a tunnel. the tunnel is filled with cars, represented of cubes. to generate the structured mesh i have to subdivide the inside volume of the tunnel into seperated volumes. do i have to subdivede them manual or is there a function in GiD, which can do this.
i have the fundamental problem that the generation of the mesh with two seperated volumes does not works like i want.
for example:
two boxes, one big and one small.
the small box is inside the big one. when i generate a structured mesh of both volumes, there is no relationship between the both meshes. i want that the boundary nodes of the small volume be part of the mesh of the big volume. how can i reach this??

thanks for your helpv
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Hi;
How can i evaluate the new features in 6.1.5.c version like :
*variable maintainoldmesh
*rjumpmesher etc..., i can not find the comamnds
thanks

MaintainOldMesh is a configuration variable of GiD. These variables can be changed
(in the command line or right buttons) with:
Utilities Variables "VariableName" "value"
for example, to set MaintainOldMesh=1:
escape escape escape Utilities Variables MaintainOldMesh 1

This option only is util to maintain the mesh of a separated piece
(is not available maintain a mesh and create another mesh sharing nodes with the old mesh).

RJUMP is a experimental mesher to mesh jumping lines between surfaces. Now It is slow an unstable.
Its use is still not advised, for this it is hidden, but to test it, you can set the variable SurfaceMesher to 4
escape escape escape Utilities Variables SurfaceMesher 4


----- Original Message -----
From: "Pablo Perez del Castillo" pablopdc at terra.es
To: gidlist at gatxan.cimne.upc.es
Sent: Tuesday, November 13, 2001 1:43 AM
Subject: [GiDlist] beta version


Hi;
How can i evaluate the new features in 6.1.5.c version like :
*variable maintainoldmesh
*rjumpmesher etc..., i can not find the comamnds
thanks

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