error running the unsteady flow post processor

[ntrommler]

Dear forum

I am always getting the above mentioned error.

The attached computation window and the error underneath show that there are neither any special characters nor a too long path for saving the *.dss file.

The last thread related to this error did not get an answer.

I would appreciate very much any help.
Thanks in advance.

EDIT: steady flow and unsteady flow without dam break run properly

[aaaaass]

I had the same problem and nothing seemed to work.

Finally I changed the "Hydrograph output interval" and "Detailed output intertval" to a Day (I had a Month before) and then the error disappeared forever.

[AbNormal_Depth]

Perhaps, RAS is having trouble with the Computation Interval = Hydrograph Output Interval = Detailed Output Interval.

Or perhaps, your simulation blew up and there is no data. A 1hour timestep for the Computation Interval is WAAAAAAYYYY to long for a dam break simulation.

For a dam failure, the computation interval should attempt to satisfy the Courant condition such that the floodwave does not propogate beyond the next cross section d/s during the next timestep. In equation form: Cr<Vwave* (Timestep/XSspacing)<1.