1. The problem statement, all variables and given/known data 2. Relevant equations CFD 3. The attempt at a solution I'm a bit confused by this question. So at first what I do for the problem on the left, I find the changes in the velocities in X and and Y on all four sides. I notice that the values on the diagram to the left are higher on top than they are on the bottom, therefore I conclude that v must be "up". I also notice that the values are higher on the right than they are on the left, therefore I conclude that u is to the right. For the diagram on the right: I notice that bottom > top, therefore v is down. Right > left, therefore u is to the right. Are these assumptions correct? After that it's a fairly simple problem but this first step has me confused as to what I'm supposed to be doing.