reduce grid size at area of interest

[Anonymous]

I’d like to reduce the grid size within a small portion of a much larger 2D flow area. The 2D flow area has 100ft grid size (lengthy river and wide floodplain). I’m interested in refining the mesh locally (at a bridge) to improve resolution of the velocity field, etc….

Any ideas? Only thing I’ve come up with so far is to add in a bunch of breaklines with smaller spacing and enforce them into mesh..yuck!

thankx

-d

[Anonymous]

works every time. I post on a forum… and within an hour or so I find a solution…

HEC RAS 5.05 has the following available in RAS mapper:

5. New 2D Polygon Mesh Refinement Tool: Within RAS Mapper there is a new tool under the 2D Flow Areas portion of the geometry. This tool is called “Refinement Regions”. The Refinement Regions tool allows the user to draw a polygon within a 2D Flow Area and then define a new cell size for inside of that polygon, as well as along the boundary of the polygon. The tool also gives the user control of how the refined region will transition from the polygon boundary to the internal cell size and to the external cell size. This tool is only available in RAS Mapper, as the HEC-RAS team is transitioning all of the model layout tools into RAS Mapper. The previous tools that were in the Geometric Data editor for model layout and editing are still there.

This sounds like the solution I was looking for…

[Author]

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