[deprecated list] Modifying the geometry of the wall?

[Chen, Feng]

Hi, Ripudaman:

According to your description, this model should be easily be modeled by YADE, you can look at one of my previous publication:

Feng Chen, Eric. C. Drumm, Georges Guiochon, 3D DEM Analysis Of Graded Rock Fill Sinkhole Repair: Particle Size Effects On The Probability Of Stability, 2009 Transportation Research Board Conference

I can email you a pdf if you cannot find it.
Feng Chen
Geotechnical Engineer
HNTB Federal
9100 Bluebonnet Centre Blvd Suite 301
Baton Rouge, LA 70809
http://fchen3.googlepages.com/home

________________________________

From: yade-users-bounces+fchen3=utk.edu-oU9gvf+***@public.gmane.org on behalf of Ripudaman Manchanda
Sent: Wed 6/17/2009 10:12 AM
To: yade-users-oU9gvf+***@public.gmane.org
Subject: [Yade-users] Modifying the geometry of the wall?


Hi,

I am working on a specific project and I need to know if I can make a hole of specific dimensions at the bottom of a box such that grains (spheres) can flow out under the application of stresses etc?

I can proceed with YADE only if this is possible. Thank you.

Ripudaman Manchanda

[Ripudaman Manchanda]

Hi,

I am working on a specific project and I need to know if I can make a hole
of specific dimensions at the bottom of a box such that grains (spheres) can
flow out under the application of stresses etc?

I can proceed with YADE only if this is possible. Thank you.

Ripudaman Manchanda

[Ripudaman Manchanda]

Hi,

Thanks for confirming this.

I tried getting the pdf, but I can't access it. I would be grateful if you
send me that document.

Also, a part of my future problem is to flow fluid at different pressure
gradients through the desired geometry. I read your conference paper on a
similar issue but in 1D where you coupled YADE and OpenFOAM. I am not very
good at coding and this shall be my first time using LINUX. So can you just
describe to me how I can the effort be reduced in coding this stuff and if
there is an easier escape route now?

Thanks

Ripudaman Manchanda
Geomechanics Intern
Schlumberger DCS
1325 S. Dairy Ashford
Houston, TX 77077

_____

From: Chen, Feng [mailto:fchen3-***@public.gmane.org]
Sent: Wednesday, June 17, 2009 9:17 AM
To: Ripudaman Manchanda; yade-users-oU9gvf+***@public.gmane.org
Subject: RE: [Yade-users] Modifying the geometry of the wall?


Hi, Ripudaman:

According to your description, this model should be easily be modeled by
YADE, you can look at one of my previous publication:

Feng Chen, Eric. C. Drumm, Georges Guiochon, 3D DEM Analysis Of Graded Rock
Fill Sinkhole Repair: Particle Size Effects On The Probability Of Stability,
2009 Transportation Research Board Conference

I can email you a pdf if you cannot find it.
Feng Chen

Geotechnical Engineer

HNTB Federal

9100 Bluebonnet Centre Blvd Suite 301

Baton Rouge, LA 70809

http://fchen3.googlepages.com/home

_____

From: yade-users-bounces+fchen3=utk.edu-oU9gvf+***@public.gmane.org on behalf of
Ripudaman Manchanda
Sent: Wed 6/17/2009 10:12 AM
To: yade-users-oU9gvf+***@public.gmane.org
Subject: [Yade-users] Modifying the geometry of the wall?


Hi,

I am working on a specific project and I need to know if I can make a hole
of specific dimensions at the bottom of a box such that grains (spheres) can
flow out under the application of stresses etc?

I can proceed with YADE only if this is possible. Thank you.

Ripudaman Manchanda

[Chen, Feng]

Hi, Ripudaman:

Please see attached pdf file, hope it will be helpful and you are welcome to ask me questions.

Feng Chen
Geotechnical Engineer
HNTB Federal
9100 Bluebonnet Centre Blvd Suite 301
Baton Rouge, LA 70809
http://fchen3.googlepages.com/home

________________________________

From: Ripudaman Manchanda [mailto:RManchanda-***@public.gmane.org]
Sent: Wed 6/17/2009 10:45 AM
To: Chen, Feng; yade-users-oU9gvf+***@public.gmane.org
Subject: RE: [Yade-users] Modifying the geometry of the wall?


Hi,

Thanks for confirming this.

I tried getting the pdf, but I can't access it. I would be grateful if you send me that document.

Also, a part of my future problem is to flow fluid at different pressure gradients through the desired geometry. I read your conference paper on a similar issue but in 1D where you coupled YADE and OpenFOAM. I am not very good at coding and this shall be my first time using LINUX. So can you just describe to me how I can the effort be reduced in coding this stuff and if there is an easier escape route now?

Thanks

Ripudaman Manchanda
Geomechanics Intern
Schlumberger DCS
1325 S. Dairy Ashford
Houston, TX 77077

________________________________

From: Chen, Feng [mailto:fchen3-***@public.gmane.org]
Sent: Wednesday, June 17, 2009 9:17 AM
To: Ripudaman Manchanda; yade-users-oU9gvf+***@public.gmane.org
Subject: RE: [Yade-users] Modifying the geometry of the wall?


Hi, Ripudaman:

According to your description, this model should be easily be modeled by YADE, you can look at one of my previous publication:

Feng Chen, Eric. C. Drumm, Georges Guiochon, 3D DEM Analysis Of Graded Rock Fill Sinkhole Repair: Particle Size Effects On The Probability Of Stability, 2009 Transportation Research Board Conference

I can email you a pdf if you cannot find it.
Feng Chen
Geotechnical Engineer
HNTB Federal
9100 Bluebonnet Centre Blvd Suite 301
Baton Rouge, LA 70809
http://fchen3.googlepages.com/home

________________________________

From: yade-users-bounces+fchen3=utk.edu-oU9gvf+***@public.gmane.org on behalf of Ripudaman Manchanda
Sent: Wed 6/17/2009 10:12 AM
To: yade-users-oU9gvf+***@public.gmane.org
Subject: [Yade-users] Modifying the geometry of the wall?


Hi,

I am working on a specific project and I need to know if I can make a hole of specific dimensions at the bottom of a box such that grains (spheres) can flow out under the application of stresses etc?

I can proceed with YADE only if this is possible. Thank you.

Ripudaman Manchanda

[Ripudaman Manchanda]

Hi I have few questions to resolve before I can start using YADE

1) Is it possible to have a hertz mindlin contact law instead of a hooke's
contact law between granular particles?

2) Is it possible to compact an assembly under a prescribed anisotropic
stress state?

3) Is it possible to grow the size of a particle gradually?

4) Is it possible to create a circular hole at the base of a box through
which particles can escape?

thank you

Ripudaman

[Anton Gladky]

I am new to YADE, but will try to answer. If I make a mistake, I think more
experienced users/developers will correct my answers.

*Hi I have few questions to resolve before I can start using YADE*
**
*1) Is it possible to have a hertz mindlin contact law instead of a
hooke's contact law between granular particles?*
**

You just need another "constitutive law"
http://yade.wikia.com/wiki/ConstitutiveLawHowto

*2) Is it possible to compact an assembly under a prescribed anisotropic
stress state?*

Not sure, but I think yes.

**
**
*3) Is it possible to grow the size of a particle gradually?*

You can pack the needed volume as you want. You just need exact mathematical
formulas of this packing.

**
**
*4) Is it possible to create a circular hole at the base of a box through
which particles can escape?*

"Almost" circular hole can be simulated with polygon with many angles. Exact
circle hole is also possible but requires some more efforts. But with
open-source all is possible.

**
**
*thank you*
**
*Ripudaman *
_______________________________________________
Mailing list: https://launchpad.net/~yade-users<https://launchpad.net/%7Eyade-users>
Unsubscribe : https://launchpad.net/~yade-users<https://launchpad.net/%7Eyade-users>
More help : https://help.launchpad.net/ListHelp

______________________________
[ENG] Best Regards
[GER] Mit freundlichen GrÌßen
[RUS] С МаОлучшОЌО пПжелаМОяЌО
[UKR] З МайкращОЌО пПбажаММяЌО

Anton Gladkyy

[Chen, Feng]

Hi, Ripudaman:

4) Is it possible to create a circular hole at the base of a box through which particles can escape?

As you might have seen from my paper, just increase the number of pieces of the plates (I used 8, while you can use 36 or 72, 36 is smooth enough though) to approximate your circular hole.

Feng Chen
Geotechnical Engineer
HNTB Federal
9100 Bluebonnet Centre Blvd Suite 301
Baton Rouge, LA 70809
http://fchen3.googlepages.com/home

[Václav Šmilauer]

Post by Ripudaman Manchanda
1) Is it possible to have a hertz mindlin contact law instead of a
hooke's contact law between granular particles?

If you mean the law described e.g. in
http://geology.msu.edu/pdf/Poisons_S_vel.pdf (2), it means computing
contact stiffnesses from bodies' rigidities differently and updating
them based on the (varying) confining force. Quite easy to do, and
certainly a welcome addition to yade (we are here to help you with
that).

Post by Ripudaman Manchanda
2) Is it possible to compact an assembly under a prescribed
anisotropic stress state?

There is ThreeDTriaxialEngine by Luc Sibille; Bruno/Luc will tell you
how to use it.

Post by Ripudaman Manchanda
3) Is it possible to grow the size of a particle gradually?

TriaxialTest can use particle growth for compaction, you can certainly
do the same.

V.


_______________________________________________
Mailing list: https://launchpad.net/~yade-users
Post to : yade-users-oU9gvf+***@public.gmane.org
Unsubscribe : https://launchpad.net/~yade-users
More help : https://help.launchpad.net/ListHelp

[Luc Sibille]

Post by Václav Šmilauer

Post by Ripudaman Manchanda
1) Is it possible to have a hertz mindlin contact law instead of a
hooke's contact law between granular particles?

If you mean the law described e.g. in
http://geology.msu.edu/pdf/Poisons_S_vel.pdf (2), it means computing
contact stiffnesses from bodies' rigidities differently and updating
them based on the (varying) confining force. Quite easy to do, and
certainly a welcome addition to yade (we are here to help you with
that).

Post by Ripudaman Manchanda
2) Is it possible to compact an assembly under a prescribed
anisotropic stress state?

There is ThreeDTriaxialEngine by Luc Sibille; Bruno/Luc will tell you
how to use it.

As said Vaclav, you can use the ThreeDTriaxialEngine for that.
With the ThreeDTriaxialEngine you can choose for each of the three space
directions a control in strain or in stress. Thus, with respect to your
question about an anisotropic stress state you can prescribe for
instance a full control in stress to load the granular assembly from
sigma_1 = sigma_2 = sigma_3 = 0 to sigma_1 = 100 kPa, sigma_2 = 75 kPa
and sigma_3 = 250 kPa.

Post by Václav Šmilauer

Post by Ripudaman Manchanda
3) Is it possible to grow the size of a particle gradually?

TriaxialTest can use particle growth for compaction, you can certainly
do the same.

You can have a look at the particle growth implemented in the
"TriaxialCompressionEngine" and mainly in the engine
"TriaxialStressController", it works very well.

Luc

Post by Václav Šmilauer
V.
_______________________________________________
Mailing list: https://launchpad.net/~yade-users
Unsubscribe : https://launchpad.net/~yade-users
More help : https://help.launchpad.net/ListHelp

--
Luc Sibille

Université de Nantes - Laboratoire GeM UMR CNRS

IUT de Saint Nazaire
58, rue Michel-Ange - BP 420
44606 Saint-Nazaire Cedex, France

Tel: [phone]

_______________________________________________
Mailing list: https://launchpad.net/~yade-users
Post to : yade-users-oU9gvf+***@public.gmane.org
Unsubscribe : https://launchpad.net/~yade-users
More help : https://help.launchpad.net/ListHelp