Re: [Yade-dev] would a HarmonicForceEngine be of any interest?

[Daniel Kiracofe]

Thank you Bruno. I think I know how although I have not done it
before.  I followed the instructions at
https://yade-dem.org/doc/gitrepo.html?highlight=merge%20request and
tried method 1, but I got an error message "You are not allowed to
push code to this project.".  I don't think I can do method 2 as I do
not have GitLab Runners installed.  Do you need to add permission for
me to push a branch?  My gitlab username is daniel.kiracofe

>Hi Daniel, it makes sense. You are welcome to show this in a merge request (do 
>you know how?).
>
>Bruno
>
>On 12/05/2021 14:25, Daniel Kiracofe wrote:
>>For my own purposes, I have written a HarmonicForceEngine, which is
>>exactly what it sounds like.  Identical to HarmonicMotionEngine, but
>>applies proscribed forces instead of proscribed motion. Would this be of
>>interest to anyone else? If so I can submit a merge request.
>>
>>Daniel

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[Yade-dev] would a HarmonicForceEngine be of any interest?

[Daniel Kiracofe]

For my own purposes, I have written a HarmonicForceEngine, which is exactly
what it sounds like.  Identical to HarmonicMotionEngine, but applies
proscribed forces instead of proscribed motion. Would this be of interest
to anyone else?  If so I can submit a merge request.

Daniel
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[Yade-dev] [PATCH] correct Law2_ScGeom_ViscElPhys_Basic documentation to match source code, see https://answers.launchpad.net/yade/+question/691021

[Daniel Kiracofe]

Please find attached a quick patch to correct
Law2_ScGeom_ViscElPhys_Basic documentation to match source code, per
discussion https://answers.launchpad.net/yade/+question/691021

(apologies for the delay between the launchpad question and the patch)

Daniel
From 1fa0cd10a7831bffb015c2efa10e433f854352a1 Mon Sep 17 00:00:00 2001
From: Daniel Kiracofe 
Date: Mon, 20 Jul 2020 14:42:17 -0400
Subject: [PATCH] correct Law2_ScGeom_ViscElPhys_Basic documentation to match
 source code, see https://answers.launchpad.net/yade/+question/691021

---
 pkg/dem/ViscoelasticPM.hpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pkg/dem/ViscoelasticPM.hpp b/pkg/dem/ViscoelasticPM.hpp
index a2ef0b09a..f00dd1bae 100644
--- a/pkg/dem/ViscoelasticPM.hpp
+++ b/pkg/dem/ViscoelasticPM.hpp
@@ -137,10 +137,10 @@ public:
   "the Young modulus (young) and poisson's ratio (poisson) instead of the normal and spring constant (kn and ks). "
   "In this case, the equivalent parameters are evaluated the same way as the previous case with $kn_x = E_x d_x$, "
   "$ks_x = v_x kn_x$, where $E_x$, $v_x$ and $d_x$ are Young modulus, poisson's ratio and diameter of particle x. "
-  "\n\n - If Yound modulus (young), poisson's ratio (poisson), normal and tangential restitution coefficient (en,et) "
+  "\n\n - If Youngs modulus (young), poisson's ratio (poisson), normal and tangential restitution coefficient (en,et)"
   "are precised, the equivalent stiffnesses are evaluated as previously:  $K_n = 2\\frac{kn_1 kn_2}{kn_1 + kn_2}$, "
   "$kn_x = E_x d_x$, $K_s = 2(ks_1 ks_2)/(ks_1 + ks_2)$, $ks_x = v kn_x$. The damping constant is computed at each "
-  "contact in order to fulfill the normal restitution coefficient $e_n = (en_1 en_2)/(en_1 + en_2)$. This is "
+  "contact in order to fulfill the normal restitution coefficient $e_n = (en_1 + en_2)/2$. This is "
   "achieved resolving numerically equation 21 of [Schwager2007]_ (There is in fact a mistake in the article from "
   "equation 18 to 19, so that there is a change in sign).  Be careful in this configuration the tangential "
   "restitution coefficient is set to 1 (no tangential damping). This formulation imposes directly the normal "
-- 
2.20.1

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