Spillway symulation
I solve a problem  a sloping spillway. The grid consists cubes and therefore spillway looks as a stairway. Is it possible to exclude this effect from simulations
Thanks a lot. 
Make your mesh slope by rotating the gravity vector.
The bed of your channel should be 0 < x < L. The bed is tilted at an angle Q from horizontal and lies along the y = 0 line (x axis). The gravity vector G = abs(G)cosQ + abs(G)sinQ. Make sure your signs are all OK  this is written pretty sloppy. Good luck. 
I am not sure I understand the F3D possibility right. Does this mean I have to rotate spillway, topography and water also?

The equations you're solving can be expressed in a variety of coordinate systems. It seems to me that system you need is for the x axis to coincide with the bottom of your spillway and the y axis to be perpendicular to the bottom of the spillway. In this system, your solid boundary coincides with the x axis (y = 0) and your boundary has no staggered blocks in it.
You pick the system  that is, you "tilt" the spillway by changing the orientation of the gravity vector relative to the coordinate system. The gravity vector has two components. The x component in your new coordinate system points along the main flow direction  it drives the flow. The y component is no longer "straight down" but is perpendicular to the bottom of your spillway. The solution flow3d calculates, u, v, p, is in the tilted system. The symbols don't change, they just need to be interpreted in the tilted system. You might ask the flow science support desk about this as well. 
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