update mobility definition#288
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This patch updates the mobility definition from
M = epsi / (Tchsigma) to the dimensionally consistent form
M = epsi^2 / (Tchsigma).
As a result, all control files now require their Tch values to be scaled by epsi.
To avoid accidental use of legacy Tch values, the corresponding control-file field has been renamed from “chemical characteristic time” to “chem characteristic time,” signalling that the updated Tch must incorporate the epsi factor.
Example:
Prev conrtol file parameter:
interface thickness =0.04
chemical characteristic time = 1000
should throw an error and the new control file parameters should be:
interface thickness =0.04
chem characteristic time = 400