Hello,
I hadn't found this noted before in the forum, but there appears to be a small typo in the liggghtsCommandModel.C file for CFDEM.
Line 148 seems to be missing a set of parentheses to determine the correct couplingStepInterval value. Replacing line 148 as below seems to correct this:
couplingStepInterval_ = floor(timeInterval_+SMALL/DEMts/couplingInterval); //Original
couplingStepInterval_ = floor((timeInterval_+SMALL)/DEMts/couplingInterval); //Replaced
All the best,
Brian