[rgd]

I have a question that I couldn't find a satisfactory answer anywhere so far,
I'm simulating the flow of water in an air conditioning distributor (so far it's one phase) so it's one inlet & four outlets.
Why am I getting a negative mass flow rate at the outlets of my model? what does it depict? Because what I can see from the vector animation is that all the vectors are pointing to the same direction (as that of the inlet) which is in harmony with my simulation & hypothesis.
I also played the simulation in CFD-Post, and the animation was quite confusing, as it kept going back & forth in two opposite directions.
Can anyone please help me with that?