# Size ration in a 2D analysis

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 October 22, 2013, 08:16 Size ration in a 2D analysis #1 New Member   Marcus Fernandes Araujo Filho Join Date: Sep 2013 Posts: 10 Rep Power: 5 Sponsored Links Dear all, I´m conducting a 2D analysis of a spillway to have some preliminary results and I ran into a doubt. When we ahave a 3d mesh there are certain size ratio relationships we must follow in order to have good results. How does that work in a 2D mesh? For example, if I have a 2D analysis in the XZ plane with cels with 0.25m by 0.25m, can I have one cell in the Y direction 1m wide or is is better to have a 0.25m cell in the Y direction as well? Does the size ratio matter in this case? I hope I made myself clear. Thank you in advance. Marcus

 October 22, 2013, 10:41 #2 Senior Member   Jeff Burnham Join Date: Apr 2010 Posts: 204 Rep Power: 10 The size of the cell in the 2-D direction doesn't matter. FLOW-3D tracks volume of flow, so if the y-direction cell size is 1 m, then it makes converting 3-D volumes and 2-D areas easier. Marcus.filho likes this.

 October 22, 2013, 19:27 #3 New Member   Marcus Fernandes Araujo Filho Join Date: Sep 2013 Posts: 10 Rep Power: 5 Thank you Jeff. So it is actually a good practice in 2D analysis always to have a 1 meter size cell in the dimension which is not beeing modeled?

 October 27, 2013, 23:38 #4 Senior Member   Jeff Burnham Join Date: Apr 2010 Posts: 204 Rep Power: 10 Yeah. It's a good thing, at least for interpreting the results. If it's a 3-D model, cubic cells are better, but 2-D it doesn't matter.

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