CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   FLOW-3D (http://www.cfd-online.com/Forums/flow-3d/)
-   -   BcData in Dam simulation (http://www.cfd-online.com/Forums/flow-3d/27242-bcdata-dam-simulation.html)

Julien October 8, 2008 10:23

BcData in Dam simulation
 
Dear users of Flow-3D,

I am currently modelling a dam with pipes(with v 9.3), so that I have free surface as upstream which is not the case in the dam's structure.

Despite I use free surface option.

My mesh stops under the dam, so in the middle of the pipes (there are 3 pipes, 80 meters long)), and I have used different downstream boundarie conditions (Outflow, Specified pressure, continuative...). But the head trought my pipes increases of 2 meters in the last 30 meters of the mesh (in x direction)...physically impossible...

I suspect it is caused by the pressure in the flow, but... Does anybody know why? It seems to be strange. What kind of boundarie condition shall I use (I don't want to impose the flowrate)?

Thanks

Julien



All times are GMT -4. The time now is 11:19.