When I look at the results of a simulation the velocity arrows point up hill (up slope) for the first few seconds. After that, the arrows gradually reverse direction and point downhill. What might I be doing wrong? Does anyone have an idea?
I found that this problem is related to the algorithm used to make the grid. The problem occurs when I use “create grid by dividing rectangular region” but it does not occur when I use “create grid shape solving Poisson equation.” My elevation data describe a simple straight channel.
That was quite a great answer!!
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