Re: [Yade-users] [Question #692660]: Heterogeneous complex material shape
Question #692660 on Yade changed:
https://answers.launchpad.net/yade/+question/692660
Status: Open => Answered
Jan Stránský proposed the following answer:
Hello,
as discussed in mentioned question/256038, you can use pack.inGtsSurface for
this purpose:
###
import gts
from yade import pack
horseFile =
"/home/honzik/programs/yade/trunk/examples/gts-horse/horse.coarse.gts"
with open(horseFile) as f:
horse = gts.read(f)
horse.scale(100,100,100)
O.bodies.append(pack.gtsSurface2Facets(horse))
s1 = sphere((0,0,0),1)
s2 = sphere((2,0,0),1)
s3 = sphere((4,0,0),1)
sphs = (s1,s2,s3)
O.bodies.append(sphs)
pred = pack.inGtsSurface(horse)
for sph in sphs:
center = sph.state.pos
radius = sph.shape.radius
# "call" the predicate to test if a sphere/point is inside
print("sphere ({},{}) inside: {}".format(center,radius,pred(center,radius)))
print("center {} inside: {}".format(center,pred(center,0)))
###
The "left" sphere is "almost" inside, but along -x axis it is outside,
therefore the result False.
the testing horse.coarse.gts is part of yade project [1].
The inGtsSurface testing is not exact [2], it checks 6 points (center +- radius
along 3 axes) to be inside the mesh. You can test more points "manually" if
desired (line center in the above example)
the gts surface can be loaded from file or constructed programatically.
cheers
Jan
[1]
https://gitlab.com/yade-dev/trunk/-/blob/master/examples/gts-horse/horse.coarse.gts
[2]
https://yade-dem.org/doc/yade.pack.html#yade._packPredicates.inGtsSurface.__init__
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Re: [Yade-users] [Question #692660]: Heterogeneous complex material shape
Question #692660 on Yade changed: https://answers.launchpad.net/yade/+question/692660 Jan Stránský posted a new comment: > O.bodies.append(pack.gtsSurface2Facets(horse)) just a note, it is not needed to convert the surface to simulation, I put it there just for illustration. The surface can be just the surface for the point-inside-testing, no facets needed. -- 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 #692660]: Heterogeneous complex material shape
New question #692660 on Yade: https://answers.launchpad.net/yade/+question/692660 Hi, I know there are ways to use the plane equation to check if a DE is in the positive or negative halfspace (question/256038) to be able to delete it or assign properties. But what if I want to check if a DE is inside a complex shaped mesh, eg a surface that is created by superposed folding like a egg container. I read about another method in which rays are send out and depending on if the number of mesh intersections are even or odd the DE is outside or inside. It sounds pretty easy but the detection of intersections is not so straight forward. Anyway if it is necessary I will do it. Before I go that route is there something already in YADE that I can use instead? Thanks Chris -- 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
Re: [Yade-users] [Question #692609]: Triaxial test of cylindrical specimens
Question #692609 on Yade changed: https://answers.launchpad.net/yade/+question/692609 Status: Open => Answered Jan Stránský proposed the following answer: Hello, one option is the "discretize" the cylindrical surface e.g. with boxes and apply forces the the boxes. This can simulate confining pressure on cylindrical-shaped specimen. cheers Jan -- 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 #692650]: How to use the DFNFlowEngine
New question #692650 on Yade: https://answers.launchpad.net/yade/+question/692650 Hi, I am trying to simulation a standard penetration test on saturated soil. I've been told that the FlowEngine is restricted to quasi-static regimes and may not be suitable for the penetration test. Therefore, I want to use DFNFlowEngine instead. However, I didn't find any instructions about DFNFlowEngine on Yade Documentation and don't have a clue how to use it. I'd be appreciate if somebody could show me some related articles or examples. Thanks in advance. -- 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
