The example that OpenModelica gives itself (Under Fluids.Examples.PumpingSystem) does not work. I tried using the stable and nightly build. Still no luck. I get the following error:

[2] 12:21:23 Translation Error Internal error IndexReduction.pantelidesIndexReduction failed! System is structurally singulare and cannot handled because number of unassigned equations is larger than number of states. Use -d=bltdump to get more information.

[3] 12:21:23 Translation Error post-optimization module replaceHomotopyWithSimplified (initialization) failed.

[4] 12:21:23 Translation Error No system for the symbolic initialization was generated

For some context, I'm trying to get this to work just so I have a model where a prescribed pump works. I have yet to get any model with a Prescribed pump working.

Thanks!