Exporting Velocity

[Brianna]

Hello,
I am a first time user, I have set up a 2D flow area to model flooding in a coastal/bay area. I have created the mesh/geometry and ran the unsteady flow analysis, but now I am trying to export velocity data from different areas of the model. Whenever I export velocity through the results map on RAS Mapper, the data is all zeroes. How should I go about exporting velocity to actually get data?
All help is appreciated, thank you in advance!

[cameron]

are you trying to save the velocities as a raster or something else? You can set HEC-RAS to save out the Vx and Vy and each cell node and use that data in GIS or other software.

[Anonymous]

How do you save the Vx and Vy? That would be perfect for what I am trying to do. Thank you for the reply.

[cameron]

in the Options|Output Options|HDF5 Write Parameters window you can check a box for it to write velocity data at the face node locations.

The data will be saved in the hdf file for the plan (*.p01.hdf).

[Anonymous]

Ok, but how do I export the hdf? I tried managing results on the ras mapper, but the velocity has no data. Please let me know. Again, thanks for the help!

[M. L. Harris]

Hi! Do you happen to know if the velocity at the face is the instantaneous velocity at the output time, or the averaged velocity over the time since the last output?

[Anonymous]

Instantaneous.

[M. L. Harris]

Hi and thanks! Is this documented in any of the RAS manuals? Or do you know this from experience?

[Anonymous]

It is probably documented. But you can do an easy test. Do a run with hourly output. Then do one minute output. The one minute output that falls on the hour should match the hour output. If the hour was averaged, that would not be the case.

[Author]

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