k-omega SST RANS of a supersonic cavity using rhoCentralFoam

maddy11 · February 4, 2019, 08:51

Hi all,

I'm simulating a supersonic cavity in rhoCentralFoam using SST k-omega model. My only problem is that the pressure fluctuations are slowly dying down. Why is this occuring? Anyone has a clue about this? Kindly reply asap.

maddy11 · February 7, 2019, 01:29

If anyone knows about this problem, kindly help pls!!

AlphaSierra · February 12, 2019, 02:09

Hey Maddy,

Can you please elaborate on your issue? What BCs are you using and what are the initial conditions?

Anjay

maddy11 · February 13, 2019, 02:48

Hi Anjay,

Thanks for your reply.

Inlet - initial velocity profile given and inlet pressure provided.
Walls - No slip and Zerogradient for pressure.
Outlet - Wavetransmissive for pressure and velocity.
Top - Wall

Initial conditions:
Inlet pressure = 39386.2 Pa
Mach 2.0 and Temperature = 166.66 K

y+ is 20.
Standard Wall functions are implemented in OpenFOaM.
Solver: rhoCentralFoam

Kindly let me know your mail ID. I can ping you if more details are needed.

Maddy.

AlphaSierra · February 13, 2019, 03:47

Hey,

Your initial values for k and omega are very important as well.

https://www.cfd-online.com/Wiki/Turb...ary_conditions

This link might help. The turbulence dissipation might be causing your problems.

Anjay

February 4, 2019, 08:51	k-omega SST RANS of a supersonic cavity using rhoCentralFoam	#1
maddy11 Member madz Join Date: Sep 2018 Posts: 34 Rep Power: 8	Hi all, I'm simulating a supersonic cavity in rhoCentralFoam using SST k-omega model. My only problem is that the pressure fluctuations are slowly dying down. Why is this occuring? Anyone has a clue about this? Kindly reply asap.

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February 7, 2019, 01:29		#2
maddy11 Member madz Join Date: Sep 2018 Posts: 34 Rep Power: 8	If anyone knows about this problem, kindly help pls!!

February 12, 2019, 02:09		#3
AlphaSierra New Member Anjay Join Date: Feb 2019 Posts: 14 Rep Power: 7	Hey Maddy, Can you please elaborate on your issue? What BCs are you using and what are the initial conditions? Anjay

February 13, 2019, 02:48		#4
maddy11 Member madz Join Date: Sep 2018 Posts: 34 Rep Power: 8	Hi Anjay, Thanks for your reply. Inlet - initial velocity profile given and inlet pressure provided. Walls - No slip and Zerogradient for pressure. Outlet - Wavetransmissive for pressure and velocity. Top - Wall Initial conditions: Inlet pressure = 39386.2 Pa Mach 2.0 and Temperature = 166.66 K y+ is 20. Standard Wall functions are implemented in OpenFOaM. Solver: rhoCentralFoam Kindly let me know your mail ID. I can ping you if more details are needed. Maddy.

February 13, 2019, 03:47		#5
AlphaSierra New Member Anjay Join Date: Feb 2019 Posts: 14 Rep Power: 7	Hey, Your initial values for k and omega are very important as well. https://www.cfd-online.com/Wiki/Turb...ary_conditions This link might help. The turbulence dissipation might be causing your problems. Anjay