tMerge branch 'master' of gitlab.com:admesg/sphere - sphere - GPU-based 3D discrete element method algorithm with optional fluid coupling
 (HTM) git clone git://src.adamsgaard.dk/sphere
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       ---
 (DIR) commit 626a05132dc7966c24a0f1326342c2c738015d14
 (DIR) parent 0b74ae13b8d8456b5d9a4331cd7d12a4fa21baba
 (HTM) Author: Anders Damsgaard <anders@adamsgaard.dk>
       Date:   Mon,  2 Sep 2019 11:30:59 +0200
       
       Merge branch 'master' of gitlab.com:admesg/sphere
       
       Diffstat:
         M python/sphere.py                    |       5 ++++-
       
       1 file changed, 4 insertions(+), 1 deletion(-)
       ---
 (DIR) diff --git a/python/sphere.py b/python/sphere.py
       t@@ -3185,8 +3185,11 @@ class sim:
        
                The value of the time step decreases with increasing fluid viscosity
                (`self.mu`), and increases with fluid cell size (`self.L/self.num`)
       +        and fluid velocities (`self.v_f`).
        
       -        and fluid velocities (`self.v_f`)
       +        NOTE: The fluid time step with the Darcy solver is an arbitrarily 
       +        large value. In practice, this is not a problem since the short 
       +        DEM time step is stable for fluid computations.
        
                :param safety: Safety factor which is multiplied to the largest time
                    step.