# River reach meshing question

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February 29, 2012, 03:22
River reach meshing question
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Chris G
Join Date: Feb 2012
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Hello everyone,

This is my first post on this top notch forum and I have a question regarding meshing a river reach. Please see the attached image for a plan view of the geometry file I am working with. (I apologize for the size)

My goal is to run a free surface shallow water model of this portion of the river and I'm wondering what the best meshing option would be? Multiple cartesian meshes, a single mesh, or a cylindrical mesh? Also, can the cartesian meshes be rotated to better represent a boundary condition?

Thank you in advance for any assistance!
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 February 29, 2012, 11:39 #2 Member   MC Join Date: Mar 2009 Posts: 56 Rep Power: 10 If you are going to use the shallow water model then you should use 1 mesh block-cartesian and only 2 cells in the z-direction. There is an example in the graphical user interface that you consult.

 February 29, 2012, 17:51 #3 New Member   Chris G Join Date: Feb 2012 Posts: 2 Rep Power: 0 Thank you for the response Melissa, A single cartesian mesh block would be ideal, but the geometry of this river bend would benefit from a rotated boundary condition applied to the downstream end of the reach. Can a cartesian mesh block be rotated, and also, can a shallow water model handle a multi block mesh if needed?

 March 1, 2012, 13:27 #4 Member   MC Join Date: Mar 2009 Posts: 56 Rep Power: 10 Currently there is no way to have a rotated mesh. Shallow water can have multiple mesh blocks you just have to be sure that in the z-direction there are 2 cells and 1 of those cells must contain the solid geometry and the fluid. Cells are not allocated in the solid.

 March 1, 2012, 13:51 #5 Member   MC Join Date: Mar 2009 Posts: 56 Rep Power: 10 sorry I cut off at the end cells are not allocated in the solid unless heat transfer is activated which I assume you will not have it activated.

 Tags flow 3d, mesh generation, meshing 3d, river, shallow water

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