Drag coefficient

Hi,the dynamics MomentumExchangeBounceBack, can be used to compute the momentum exchange, drag and lift. But the “drag” is force or coefficient? if it is force, what is its unit? lattice unit?
Hope to get your help !

Hi, it is a force in lattice units. The drag coefficient depends on reference values, such as an obstacle diameter, which the dynamics object does not have.

Thank you for your reply!