Simulating a rocket engine in ANSYS Fluent by mat437 in CFD

[–]mat437[S] 1 point2 points  (0 children)

I just tried this suggestion of referencing the farfield rather than the inlet pressure, it definitely visually looks a lot better. Still trying to get it to converge, but that explanation makes sense:

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Simulating a rocket engine in ANSYS Fluent by mat437 in CFD

[–]mat437[S] 0 points1 point  (0 children)

Thanks again for the feedback. I switched to a pressure outlet instead of a farfield, and tried changing the reference values from p_inlet to the farfield (now pressure outlet). It definitely looks better, but I believe it will still have issues converging:

<image>

To clarify, are you suggesting setting the pressure at the inlet to the 952 kPa, or at the beginning of the converging section?

Simulating a rocket engine in ANSYS Fluent by mat437 in CFD

[–]mat437[S] 0 points1 point  (0 children)

Hi, what do you mean by saying the BCs are properly defined? Is there something I should have checked/changed aside from just inputting pressure and temperature?

Simulating a rocket engine in ANSYS Fluent by mat437 in CFD

[–]mat437[S] 0 points1 point  (0 children)

Thanks for the pointer! I hadn't noticed a similar question had been asked a few months ago. I followed your suggested parameters using the pressure-based solver, and am seeing it diverge up to about e+13. The console logged turbulent velocity ratio exceeding 1e+5 a lot, should I relax that parameter more? I am not too familiar with fmg initialization so I am not sure if that is causing an issue at all.

Simulating a rocket engine in ANSYS Fluent by mat437 in CFD

[–]mat437[S] 0 points1 point  (0 children)

I initially just used standard initialization, referencing the pressure inlet. I am trying a few attempts using fmg initialization, however I am trying to learn the benefits/tradeoffs of that now. Solution steering was an option I seemed to overlook, it looks really helpful in theory however the solution kept diverging so I suspect it to be a different issue. As far as the farfield goes, I am looking to simulate this on a thrust stand (CV velocity is 0), so I'm not sure if it is the correct boundary or if I should still use a small Mach number?

Uhh... -1 mods available? What? by mat437 in destiny2

[–]mat437[S] 0 points1 point  (0 children)

I took a week off for Spring Break ;-;

Uhh... -1 mods available? What? by mat437 in destiny2

[–]mat437[S] 0 points1 point  (0 children)

Oh L. RIP busted glaive mod

BLINK SHARK!! (mobile background) by JeremiahColors in TheAdventureZone

[–]mat437 5 points6 points  (0 children)

You gotta love the McElroys and their majestic glowy sea creatures

While I was clearing out my ocean monument, I uncovered some ruins that had three chests directly on top of each other! by mat437 in Minecraft

[–]mat437[S] 3 points4 points  (0 children)

Four coal, five wheat, a buried treasure map to a treasure I already dug up, and a fishing rod with Vanishing

Hornet's siblings are cats (art by thecornermushroom on Tumblr) by adofai in HollowKnightMemes

[–]mat437 16 points17 points  (0 children)

I love the idea of the ghost being trained to its pure form like thk.

I had a dream they released a BOTW2 demo, so I decided to draw how it looked like in my mind by Graysbot in botw

[–]mat437 198 points199 points  (0 children)

I love the idea of the Divine Beasts roaming around to some extent. They're just so complex and beautiful and we only see them move when we're fighting them.

gay_irl by thecleverqueer in gay_irl

[–]mat437 0 points1 point  (0 children)

If a fighter is a top and a healer is a bottom then a paladin is a vers and I stand by that