momentum Exchange BounceBack

I have found that there is an exchange momentum dynamics in palabos.
And it can be found in the examples/codeByTopic/bounceBack/computeDrag.cpp

But when I looked into this dynamics, MomentumExchangeBounceBack, I found many lines noted that “//Yields 0”.
What does this mean? This function has not been finished yet?


Dear Maggie,

These comments ("///Yields 0") just mean most of the times that the specific function returs 0. The code for MomentumExchangeBounceBack is finished and you can use it as the “computeDrag.cpp” example demonstrates.


i dont understand