Quasi-static multiphase flow?

henris42 · July 5, 2021, 21:35

Hi,

As a part of my thesis work, I'm modeling a cavitating impeller in water.

My thesis advisor recommended me to do a quasi-static investigation in STAR-CCM - but I'm wondering if that would be also feasible in OpenFOAM.

In STAR-CCM, the plan is to model only one blade as a symmetric angular section.
We'd need full multiphasic flow to see real effect - I've been investigating the
interPhaseChangeFoam solver, if that could be somehow applied. We'd however need compressible flow in the gas phase for any accuracy though.

I was wondering is this kind of approach feasible in OpenFOAM, or would I need to do a full unsteady simulation?

Cyp · July 6, 2021, 03:07

local time step (LTS) is the keyword you are looking for. InterFoam has a LTS implementation.

Cheers,
Cyprien

henris42 · July 6, 2021, 04:14

OK, that looks promising. But what about symmetry? We're symmetrical in cylinderical coordinates.

Optimally the whole solver should be in cylinderical coordinates - is that possible?

geth03 · July 6, 2021, 04:55

openfoam uses cartesian coordinates

henris42 · July 10, 2021, 17:25

Thanks, as my system has 6 blades it sounds like only half-plane symmetry would be usable, correct?

//HS

July 5, 2021, 21:35	Quasi-static multiphase flow?	#1
henris42 New Member Henri Sundelin Join Date: Jul 2021 Posts: 3 Rep Power: 4	Hi, As a part of my thesis work, I'm modeling a cavitating impeller in water. My thesis advisor recommended me to do a quasi-static investigation in STAR-CCM - but I'm wondering if that would be also feasible in OpenFOAM. In STAR-CCM, the plan is to model only one blade as a symmetric angular section. We'd need full multiphasic flow to see real effect - I've been investigating the interPhaseChangeFoam solver, if that could be somehow applied. We'd however need compressible flow in the gas phase for any accuracy though. I was wondering is this kind of approach feasible in OpenFOAM, or would I need to do a full unsteady simulation?

July 6, 2021, 03:07		#2
Cyp Senior Member Cyprien Join Date: Feb 2010 Location: Stanford University Posts: 299 Rep Power: 18	local time step (LTS) is the keyword you are looking for. InterFoam has a LTS implementation. Cheers, Cyprien __________________ www.cypriensoulaine.com/openfoam

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July 6, 2021, 04:14		#3
henris42 New Member Henri Sundelin Join Date: Jul 2021 Posts: 3 Rep Power: 4	OK, that looks promising. But what about symmetry? We're symmetrical in cylinderical coordinates. Optimally the whole solver should be in cylinderical coordinates - is that possible?

July 6, 2021, 04:55		#4
geth03 Senior Member Join Date: Dec 2019 Location: Cologne, Germany Posts: 355 Rep Power: 8	openfoam uses cartesian coordinates

July 10, 2021, 17:25		#5
henris42 New Member Henri Sundelin Join Date: Jul 2021 Posts: 3 Rep Power: 4	Thanks, as my system has 6 blades it sounds like only half-plane symmetry would be usable, correct? //HS