accuracy
Posted: Wed Jan 06, 2010 9:58 pm
Hi,
It seems if the driving force is too high compared with interface energy, both the time step and cell size should be decreased. If only diminish time step but keep cell size as before, the accuracy decreases.
For example, when mobility=1, driv_force=1, velocity=0.9 (90% accurate); mobility=1,driv_force=100, velocity=80 (80% accurate). This will lead to nonlinear relationship between velocity and driving force in a simulation where driving force varies greatly.
How to deal with this problem, decrease time step, cell size and/or increase interface thickness? it is noted that the change of the cell size and thickness will affect the domain size and upper bound of curvature.
It seems if the driving force is too high compared with interface energy, both the time step and cell size should be decreased. If only diminish time step but keep cell size as before, the accuracy decreases.
For example, when mobility=1, driv_force=1, velocity=0.9 (90% accurate); mobility=1,driv_force=100, velocity=80 (80% accurate). This will lead to nonlinear relationship between velocity and driving force in a simulation where driving force varies greatly.
How to deal with this problem, decrease time step, cell size and/or increase interface thickness? it is noted that the change of the cell size and thickness will affect the domain size and upper bound of curvature.