move velocity boundary conditions to BoundayConditions folder and deleted the following velocity boundary conditions:

BcVel27;
QVelDeviceCouette27;
QVelDevice1h27;
QVelDevCompPlusSlip27;
QVelDevCompThinWalls27;
QVelDevIncompHighNu27;
QVelDevCompHighNu27;
QVeloDevEQ27