Open channel flow


#1

Hi, I’m a newbie to CFD. I’ve imported a model of a culvert, which is basically an open channel with water flowing into two pipes. I can’t figure out how to define the boundary condition on top of the channel so i get open channel results.

The pipes can flow part full at low flow rates. How do I set the outlet BC? I’m using flow rate at present.


#2

@steve22 - thanks for your question and welcome to SimScale!

I’m adding your project link to this thread:

https://www.simscale.com/projects/steve22/tutorial-02-_pipe_junction_flow


#3

For the outlet conditions, I’d recommend using a zero pressure outlet:

Also had a look at your Topo entity sets and your missing some wall faces (I assume they are quite small). I think there should be 27.

I’m running the simulation now and will get back to you with the results as soon as they are ready


#4

@steve22:

You’ll find my simulation runs here - I also ran some multiphase simulations to model low flows:

https://www.simscale.com/projects/AnnaFless/tutorial-02-_pipe_junction_flow_3