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Old   June 24, 2014, 01:41
Default cfd solver
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hi
my domain is a quarter of the original geometry of supersonic wind tunnel.wind tunnel mach number is 1.8 . in my domain Using tow symmetry boundary conditions and tow wall boundary condition and a boundary condition input and an output boundary condition my simulation cfx Boundary conditions is:
ANALYSIS TYPE:
Option = Steady State
TURBULENCE MODEL:
Option = k epsilon
BOUNDARY: inlet
FLOW REGIME:
Option = Subsonic
END
HEAT TRANSFER:
Option = Static Temperature
Static Temperature = 300 [K]
END
MASS AND MOMENTUM:
Option = Total Pressure
Relative Pressure = 1.8 [bar]
TURBULENCE:
Option = Medium Intensity and Eddy Viscosity Ratio
END
BOUNDARY: outlet
Boundary Type = OPENING
Location = outlet
FLOW REGIME:
Option = Subsonic
END
HEAT TRANSFER:
Opening Temperature = 300 [K]
Option = Opening Temperature
END
MASS AND MOMENTUM:
Option = Opening Pressure and Direction
Relative Pressure = 84000 [Pa]
END
TURBULENCE:
Option = Medium Intensity and Eddy Viscosity Ratio
END


wall
HEAT TRANSFER:
Option = Adiabatic
END
MASS AND MOMENTUM:
Option = No Slip Wall
END
WALL ROUGHNESS:
Option = Smooth Wall
END

After 1600 itration cfx solver stop solution .
The error is in the attached image:
Please Help me, please
Thanks for all
Attached Images
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File Type: jpg 2014-06-24_092252.jpg (26.2 KB, 7 views)
File Type: jpg 2014-06-24_092318.jpg (71.7 KB, 6 views)
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Old   June 24, 2014, 02:26
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Try to define inner type of outlet
you can make mass flow on inlet and outlet (if you know values of these BC).
The next step is to increase memory allocation in solver (default 1). You can increase to 3.
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Old   June 24, 2014, 02:27
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Or so You can change to static pressure on outlet
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Old   June 24, 2014, 02:43
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hi
Martin
Thanks for the answer
I do not know the mass flow inlet and outlet. But by placing the static pressure at the outlet boundary conditions arise during Solve backflow
Why is this form of residuals?
And why the solution is stopped?
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Old   June 24, 2014, 02:45
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I am using the quick processing center. Many computing cores is 28 digit
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Old   June 24, 2014, 02:49
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Quote:
Originally Posted by Martin_Sz View Post
Try to define inner type of outlet
you can make mass flow on inlet and outlet (if you know values of these BC).
The next step is to increase memory allocation in solver (default 1). You can increase to 3.
What do you mean?
Try to define inner type of outlet
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Old   June 24, 2014, 04:23
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Inner like mass flow, static pressure etc.
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Old   June 24, 2014, 04:27
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your solution is stopped because You have high velocity on inlet - and that makes high pressure on domain. So on the outlet you have overflow.
You can also change solver model (turbulence) to SST.
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Old   June 24, 2014, 11:13
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Quote:
Originally Posted by Martin_Sz View Post
your solution is stopped because You have high velocity on inlet - and that makes high pressure on domain. So on the outlet you have overflow.
You can also change solver model (turbulence) to SST.
by solver model (turbulence) to SST i can not capture normal shock in the duct.in the inlet velocity is ~=68 m/s
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