Convergence problem!!- Pressure based solver

raviteja gonnabathula · October 29, 2019, 03:15

I'm using pressure based solver to simulate a hyper-sonic combustion chamber.
K-epsilon turbulence model
energy equation - on
species - Hydrogen-air
while solving the continuity equation trend goes high with respect to no of iterations,I have tried the following methods suggested by many users in CFD forums and fluent guide too
1. reducing courant number
2. reducing URF
3. refining the mesh quality
4. changing the turbulence models
5. switching off energy equation for first 50 iterations
none of the above methods solved my problem..
I Hope your suggestions might solve...
you can also reach me at:
raviteja.gonnabathulla@gmail.com

MekTek · October 29, 2019, 14:02

Hi Ravi,

What are your boundary conditions?

Mails fail to send to the provided mail id.

raviteja gonnabathula · October 29, 2019, 22:44

Thanks for your reply
Boundary conditions:
air inlet:
u=438 m/s
t=1200 k
p=260000pa
fuel inlet:
u=1200m/s
t=248 k
p=460000

raviteja gonnabathula · October 30, 2019, 05:32

Quote:

Originally Posted by MekTek

Hi Ravi,

What are your boundary conditions?

Mails fail to send to the provided mail id.

Thanks
mail corrected

October 29, 2019, 03:15	Convergence problem!!- Pressure based solver	#1
raviteja gonnabathula New Member RaviTeja Gonnabathula Join Date: Oct 2019 Posts: 10 Rep Power: 7	I'm using pressure based solver to simulate a hyper-sonic combustion chamber. K-epsilon turbulence model energy equation - on species - Hydrogen-air while solving the continuity equation trend goes high with respect to no of iterations,I have tried the following methods suggested by many users in CFD forums and fluent guide too 1. reducing courant number 2. reducing URF 3. refining the mesh quality 4. changing the turbulence models 5. switching off energy equation for first 50 iterations none of the above methods solved my problem.. *I Hope your suggestions might solve...* you can also reach me at: raviteja.gonnabathulla@gmail.com Last edited by raviteja gonnabathula; October 30, 2019 at 05:31.

October 29, 2019, 22:44		#3
raviteja gonnabathula New Member RaviTeja Gonnabathula Join Date: Oct 2019 Posts: 10 Rep Power: 7	Thanks for your reply Boundary conditions: air inlet: u=438 m/s t=1200 k p=260000pa fuel inlet: u=1200m/s t=248 k p=460000 Last edited by raviteja gonnabathula; October 30, 2019 at 05:32.

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October 29, 2019, 14:02		#2
MekTek New Member Venkat Join Date: Apr 2019 Location: Bengaluru Posts: 7 Rep Power: 8	Hi Ravi, What are your boundary conditions? Mails fail to send to the provided mail id.