I'm getting an "Unresolved Region" warning for "Condition name : Fluid Subdomain 1". What does that mean?
The model is just a propeller in a rotating region in freestream flow. I had this propeller in a simulation of an airplane and I wasn't getting this error. Now that I've removed the airframe, the error has started popping up.
Thanks Jared. I'm 99.99% (exactly) sure that it's not a geometry issue. It may be a coarse mesh issue, with cells spanning too much of the rotating region. I forced several refinements and it still didn't resolve the issue. I'll try a finer initial mesh and see if that helps.
I'm using a fluid subdomain because that's how I was trained to insert farfield flow conditions. I don't see another way aside from building a cube around the fluid domain, doing an 'internal' flow, and applying velocity boundary conditions on the edges (that's how I would do it in other tools).
in flow simulation, just use an external analysis
This is probably an ignorant question, but since I was trained to use a subdomain, I'm confused. If you use an external analysis without a subdomain, where are freestream conditions set (i.e. how do you set the boundary conditions?)
initial/ambient conditions
you're certainly welcome to do an internal analysis like a wind tunnel
but even then, you don't need a fluid subdomain, your default fluid would apply
Huh, ok. That's not at all intuitive to me... initial conditions are not the same as boundary conditions, by definition.
But, in application, is there a difference between applying a fluid subdomain with my boundary conditions (velocity components, temperature, pressure) and applying initial/ambient conditions? I'm hoping they behave the same so my results to date aren't suspect.
not sure if you have checked out the tutorials/validation examples but there should be an external flow analysis example that goes through this process if you want toget tuned into the way that flow works
the method of building a wind tunnel is similar other than there are walls instead of freestream
sounds like a geometry issue, i'd check this out:
http://www.hawkridgesys.com/blog/flow-simulation-4-starting-flow-simulation-analysis/
or your mesh is way too coarse
would really need more info about why you're using a fluid subdomain in this case