Source file "tangential_model_no_history.h" contains string with number 90:
if (vrel != 0.0) Ft = min(Ft_friction, Ft_damping) / vrel;
but this expression does not correlate with the main formula for force between particles (see doc/pair_gran.html), where the tangential part F_t consists of two components:
Ft_friction minus(!) Ft_damping
Simple example of collision of two rough particles without viscosity (gammat = 0 or Ft_damping = 0) shows that the value of tangential force Ft always will be equal zero, that is completely wrong.
ckloss | Mon, 08/24/2015 - 10:10
Hi sirop,
Hi sirop,
I do not get your point - if you use tangential without history and chose gammat = 0, then the total force will of course be zero because both parts (spring and damper) are zero.
I do not at all see what should be wrong here. If you want a different behavior, chose the history model
Christoph
RAJ KASHYAP | Sat, 08/04/2018 - 15:00
Model for compression history effect
I cannot see any significant change in flow rate by compressing the particles by including both hertz and cohesion model. Which model is suitable for such type of process ?
Thanks in advance