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warning "pressure corrections limited in 1540604 cells in region FLUID"

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Old   June 18, 2012, 16:07
Default warning "pressure corrections limited in 1540604 cells in region FLUID"
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David L
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I have the output: "pressure corrections limited in 1540604 cells in region FLUID"

What can I do?
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Old   June 18, 2012, 18:47
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Well, that depends on when that message appears and for how long. Usually it indicates the initialization is bad or there are too high pressure / velocity gradients in your domain.
When it's right at the beginning and your case keeps running and the message disappears after some (hundered) iterations, I would ignore it.
When the number drops to some few cells where the pressure correction was limited, I would ignore it.
When the case crashes right at the beginning, try a better initialization.
When it crashes after some iterations but the number of cells drops, try to reduce the under relaxation factors.
When the message still occurs after a lot of iterations, check your boundary conditions and your mesh.
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Old   June 19, 2012, 12:48
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thanks but I want to simulated a pipe with internal fluid, with these real datas: Pin(Pa),Tin (C), m (kg/s), Pout (Pa), Tout (C)

Pin=3.517 MPa
Tin=204 C


Tout=242 C
Pout=3.5083 Mpa

I do not know exactly the best option for my initialization wit my fluid, inlet and outlet. I used this inicial condition:

1║ my fluid:
Reference Values:

References Pressure:3.517 MPa

Inicial condition:

Pressure: 3.517 MPa
S Temperature: 204 C
Velocity:0.3146 m/s
2║ inlet-->velocity inlet
S Temperature: 204 C
Turbulence Intensity:0.037
Turbulent length Scale:4mm
Velocity Magnitude:0.3146 m/s
3║Outlet-->Pressure
Pressure:0mpa
Static Temperature:242 C
Turbulent length Scale:4mm
Turbulent viscosity ratio: 10

is the best way to set the inicial condition?
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Old   June 19, 2012, 20:02
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It looks suspicious to me that the reference pressure is that high. You should consider, all pressure settings in Star-CCM+ are relative to the reference pressure. So setting a reference pressure of 3.517 MPa and an initial pressure of 3.517 would result in an absolute initial pressure of 7.034 MPa. So I think, you meant a reference pressure of about 1 bar?

Anyway, it is still unclear when your issue occurred. Was it right after starting the simulation, or was it after some iterations? If so, after how many iterations?
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Old   June 19, 2012, 20:39
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i have seted a reference pressure of 0.1 MPa (0.5 and 1MPa) and an initial pressure of 3.517 would result in an absolute initial pressure of 4.734 MPa, only wit 9 interation (20, 50) and it run stopped because IAPWS-IF97 outside range Tout, frist momet BIGGSTAB DID NOT CONVERGE.

Do you have any idea? I used good table, velocity. I do not know ....

thanks for your post
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