Error when using the generate-new command

3DEC
1

Hi there!

I am having troubles when using the generate-new command in 3DEC 7.00. I provide my script below.

Here is the thing: I have two planes, and I would like to refine the mesh around some points.

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image1170×671 9.97 KB

Refining around first and third points just work ok:

image
image1173×672 21.4 KB

However, refining around the second point raises the following error [CM2_ERROR] Two nodes are too close to each other (same position or almost) even if I try to refine around this point only.

Testing the gradation-surface and gradation-volume did not solve the error.

Am I doing something wrong?

Thanks in advance for your help and suggestions!

Regards

Théophile

PS : the script

model new

block create brick 0,1000

block cut joint-set origin (500.0, 500.0, 500.0) dip 40.0 dip-direction 270.0
block cut joint-set origin (400.0, 500.0, 400.0) dip 60.0 dip-direction 90.0

data scalar add (100.0, 500.0, 919.6152422706631) group "pt=1"
data scalar add (187.42671061339095, 500.0, 237.71986815982717) group "pt=2"
data scalar add (549.0581942390521, 500.0, 141.82363429349132) group "pt=3"

block zone size isolated-point (100.0, 500.0, 919.6152422706631) edgelength 20
block zone size isolated-point (187.42671061339095, 500.0, 237.71986815982717) edgelength 20
block zone size isolated-point (549.0581942390521, 500.0, 141.82363429349132) edgelength 20

block zone generate-new gradation-surface 0.5 gradation-volume 0.5 maximum-edge 200 minimum-edge 20
2

@Huy can you help with this?

3

Hello,
The idea of the isolated-point is to specify a zone size near a point inside a blocks. This command has been improved in 3DEC9.0.
However, in 3DEC7.0, what you can do is to to reduce the edge length near the second point as following.

block zone size isolated-point (187.42671061339095, 500.0, 237.71986815982717) edgelength 10

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image1340×813 63.6 KB

4

Hi @Huy !

Your suggestion did work, thanks a lot!

Also, I tested the same script with 3DEC9.0 (with a refining of 20 around all three points).
No vertex was inserted at point 2 but at least the process did not crash.

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image1303×711 32.2 KB

I used the isolated-point command since it was a suggestion from an Itasca presentation of 3DEC meshing solutions. Would you advise using another one?

Théophile

5

Hi, you can try to specify the zone size on these faces to get a fine mesh.
You can test a new option number-control-point in the command “BLOCK ZONE GEN-NEW”. By default, this number is 5.

Huy

6

Hi!

Thanks for the hint. I did test modifying number-control-point but point 2 is still missing.
Anyway, with all the information you gave me, I should be ok for now, thanks again.

Théophile

PS : it seems like today is your birthday, so I hope you don’t mind if I wish you a happy one!

7

Thank you @Theophile