Dears, I am trying to model a geometry of a trapezoidal channel having a pole inside the channel. The channel bottom width is 1.2 and the pole that is standing inside the channel has a size of 0.6 m*0.6 m in plan. When I am trying to use the grid size lesser than 1m, an error message appears. And when I run the simulation using 1m*1m grid size, I dont see any velocity variations due to the pole effect. Please give your suggestions.