Hello Itascans,
I would like to represent a slope using a different mesh resolution in FLAC v.8. The domain must be very large, as the slope being analysed is 2700m long and 700m high. As can be seen from this sketch, I would like to generate a coarse mesh (e.g. 100m) for the lower part of the slope, and a more resolved mesh for the upper part (e.g. 10m):
Does anyone have any ideas how I can do this?
You can use Build->Generate->Geometry Builder to create the mesh, and select ‘Apply density multiplier’ option to densify the upper mesh.
Hello Jwang and thank you for your reply!
I should have solved the mesh problem thanks to your advices.
I did not use the slope geometry interface since my slope is a little bit more articulated in terms of geometry. I just created two boxes grids and then I modified their resolution (10m for the bottom box and 2m for the upper one). I then used different lines (i.e., gen line command) to shape the slope. This is the script that I wrote:
set gravity 9.81 ; m/s2
config creep thermal extra 5
grid 1801,100
gen 0.0,0.0 0.0,300.0 3000.0,300.0 3000.0,0.0 i=1,301 j=1,31
gen 0.0,300.0 0.0,500.0 3000.0,500.0 3000.0,300.0 i=302,1802 j=1,101
; Define material models
model elastic i=1,300 j=1,30
model elastic i=302,1801 j=1,100
; Attach grids
attach aside from 302,1 to 1802,1 bside from 1,31 to 301,31
unmark
gen line 0 0 0 406
gen line 0 406 650 406
gen line 650 406 650 356
gen line 650 356 950 300
gen line 950 300 2650 130
gen line 2650 130 2650 0
And I got this result:
However, by setting two different mesh resolutions in my domain, I have this kind of geometric problem:
In which a geometric bug lies at the boundary between the two meshes.
Do you have any idea how I can solve this problem?
Thanks in advance
You can use keyword’ ‘skipedge’ at the end of the 'generate line xxx ’ command to avoid the geometry problem, however, using ‘generate line’ command will create triangle zones along the slope, which is not recommended. You can send the geometry data to flacsupport@itascacg.com, we can take a look.
