[Yade-users] [Question #622061]: the problem of yade installation
New question #622061 on Yade: https://answers.launchpad.net/yade/+question/622061 dear sir! when I update the software, the warning as following: W:The repository 'http://ppa.launchpad.net/yade-users/external/ubuntu xenial Release' does not have a Release file., W:Data from such a repository can't be authenticated and is therefore potentially dangerous to use., W:See apt-secure(8) manpage for repository creation and user configuration details., E:Failed to fetch http://ppa.launchpad.net/yade-users/external/ubuntu/dists/xenial/main/source/Sources 404 Not Found, E:Some index files failed to download. They have been ignored, or old ones used instead. what's the problem of this and how to solve it? thanks~ -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
[Yade-users] [Question #622060]: a problem about vtk
New question #622060 on Yade:
https://answers.launchpad.net/yade/+question/622060
I am trying to run a packing model,and try to use TriaxialTest() to obtain the
strain-changing-field. I write the script following the example:
tesselationWrapper.py .
My specific script is like tihs:
-
O.reset()
O.bodies.append(geom.facetBox((.5,.5,.5),(.5,.5,.5),wallMask=63))
from yade import pack
sp=pack.SpherePack()
sp.makeCloud((0,0,0),(1,1,1),rMean=0.02, rRelFuzz=0.1)
sp.toSimulation()
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_L3Geom(),Ig2_Facet_Sphere_L3Geom()],
[Ip2_FrictMat_FrictMat_FrictPhys()],
[Law2_L3Geom_FrictPhys_ElPerfPl()]
),
NewtonIntegrator(gravity=(0,0,-9.81),damping=0.4),
]
O.dt=0.05*PWaveTimeStep()
O.run(5)
TW=TesselationWrapper()
TW.triangulate()
TW.computeVolumes()
TW.volume(20)
TW.setState(0)
O.run(10,True)
TW.setState(1)
TW.defToVtk("strain.vtk")
-
when I run the script, the result is:
-
Triangulated Grains : 7432
sym_grad_u_total_g (wrong averaged strain):
0 0 -1.0106e-17
0 0 -1.0839e-17
-1.0106e-17 -1.0839e-17 -7.99784e-17
Total volume = 0.87657, grad_u =
0 0 0
0 0 0
-2.0212e-17 -2.16781e-17 -7.99784e-17
sym_grad_u (true average strain):
0 0 -1.0106e-17
0 0 -1.0839e-17
-1.0106e-17 -1.0839e-17 -7.99784e-17
Macro strain :
0 0 0
0 0 0
0 0 0
Cannot open file [strain.vtk]
-
Can someone help me? For I am new to YADE,I cannot understand the meaning of
the result.
Thanks very much
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Re: [Yade-users] [Question #615092]: getCapillaryStress
Question #615092 on Yade changed:
https://answers.launchpad.net/yade/+question/615092
Status: Open => Answered
Jérôme Duriez proposed the following answer:
Hi,
I did not completely understand your concern, but here are few points:
In "wet simulations" you should get the equality total stress = contact stress
+ capillary stress, where:
- the total stress are measured from the boundaries, e.g. using triaxial engines
- the contact stress is the stress contribution from ("dry") contact forces =
getStress()
- the capillary stress is the stress contribution from capillary forces =
getCapillaryStress()
As an *important* note, the two get*Stress() functions require the
sample volume to be passed as an argument, with getStress having a more
user friendly default behavior (picking a correct value if the user
forgets to pass one) in this regard, though
If you do not get this equality, it means you're not using correctly the
functions, or your simulation is not quasi-static.
If your concern is that you have very low capillary stress, the answer is still
the same as in previous questions: you have too big particles (for classical
surface tension values). Play with small particle sizes, as unsaturated
experimentalists consider fine soils and not gravel.
If you wish, you may actually also try to construct the Soil Water
Characteristic Curve of your numerical sample (in this pendular regime)
to check if you have "significant" capillary pressure * saturation
product values. If not, it means again your particle sizes are too big.
Jerome
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Re: [Yade-users] [Question #620981]: record deformed shape in cohesive triaxil test
Question #620981 on Yade changed: https://answers.launchpad.net/yade/+question/620981 Status: Open => Answered Robert Caulk proposed the following answer: Hello, Are you asking us about how to record the strain of a specimen being triaxially compressed by TriaxialStressController() [1]? If your TriaxialStressController is labeled "triax": e11, e22, e33 = triax.strain[0], triax.strain[1], triax.strain[2] If you are more interested in the physical dimensions of the sample, rather than the strain: width, depth, height = triax.width, triax.depth, triax.height -Robert [1] https://yade- dem.org/doc/yade.wrapper.html#yade.wrapper.TriaxialStressController -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
[Yade-users] [Question #620981]: record deformed shape in cohesive triaxil test
New question #620981 on Yade: https://answers.launchpad.net/yade/+question/620981 Hi all, can you please advise how I can record deformed shape in cohesive triaxil test? Cheers Seti -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
