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Convergence problem!!- Pressure based solver

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Old   October 29, 2019, 03:15
Default Convergence problem!!- Pressure based solver
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RaviTeja Gonnabathula
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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.
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Old   October 29, 2019, 14:02
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Venkat
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Hi Ravi,


What are your boundary conditions?


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Old   October 29, 2019, 22:44
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RaviTeja Gonnabathula
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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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Old   October 30, 2019, 05:32
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RaviTeja Gonnabathula
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Quote:
Originally Posted by MekTek View Post
Hi Ravi,


What are your boundary conditions?


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Thanks
mail corrected
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Tags
continuity equation, convergence failure, energy equation, k-epsilon model, pressure based solver

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