# Spillway symulation

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 May 13, 2009, 10:46 Spillway symulation #1 Member   Armen A. Ghirghidov Join Date: Mar 2009 Posts: 50 Rep Power: 9 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.

 May 13, 2009, 20:34 #2 Member   private Join Date: Mar 2009 Posts: 74 Rep Power: 9 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.

 May 15, 2009, 03:22 #3 Member   Armen A. Ghirghidov Join Date: Mar 2009 Posts: 50 Rep Power: 9 I am not sure I understand the F3D possibility right. Does this mean I have to rotate spillway, topography and water also?

 May 15, 2009, 09:33 #4 Member   private Join Date: Mar 2009 Posts: 74 Rep Power: 9 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 flow-3d 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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