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Old   December 7, 2011, 18:13
Question CFX13 Post Periodic interface
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I am simulating a axial compressor rotor. I used my mesh in CFX11 and CFX 13. I waited until mass is converged for both cases.

When I used CFX 11, upper periodic side and lower periodic side have same Velocity v. But, for the case with CFX 13, upper periodic side and lower periodic side have slightly different Velocity v. Especially near blade tip.

What am I doing wrong?
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Old   December 8, 2011, 01:24
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Can you post an image? And CCL would help.
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Old   December 8, 2011, 14:18
Default Here are CCL & image
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I attached an axial cut of passage. It shows an unexplainable shift.

Thank you

Here is the CCL:
PHP Code:
 +--------------------------------------------------------------------+
 |                                                                    |
 |                    
CFX Command Language for Run                    |
 |                                                                    |
 +--------------------------------------------------------------------+
 
LIBRARY:
   
MATERIALAir Ideal Gas
     Material Description 
Air Ideal Gas (constant Cp)
     
Material Group Air DataCalorically Perfect Ideal Gases
     Option 
Pure Substance
     Thermodynamic State 
Gas
     PROPERTIES
:
       
Option General Material
       EQUATION OF STATE
:
         
Molar Mass 28.96 [kg kmol^-1]
         
Option Ideal Gas
       END
       SPECIFIC HEAT CAPACITY
:
         
Option Value
         Specific Heat Capacity 
1.0044E+03 [J kg^-1 K^-1]
         
Specific Heat Type Constant Pressure
       END
       REFERENCE STATE
:
         
Option Specified Point
         Reference Pressure 
[atm]
         
Reference Specific Enthalpy 0. [J/kg]
         
Reference Specific Entropy 0. [J/kg/K]
         
Reference Temperature 25 [C]
       
END
       DYNAMIC VISCOSITY
:
         
Dynamic Viscosity 1.831E-05 [kg m^-1 s^-1]
         
Option Value
       END
       THERMAL CONDUCTIVITY
:
         
Option Value
         Thermal Conductivity 
2.61E-2 [W m^-1 K^-1]
       
END
       ABSORPTION COEFFICIENT
:
         
Absorption Coefficient 0.01 [m^-1]
         
Option Value
       END
       SCATTERING COEFFICIENT
:
         
Option Value
         Scattering Coefficient 
0.0 [m^-1]
       
END
       REFRACTIVE INDEX
:
         
Option Value
         Refractive Index 
1.0 [m m^-1]
       
END
     END
   END
 END
 FLOW
Flow Analysis 1
   SOLUTION UNITS
:
     
Angle Units = [rad]
     
Length Units = [m]
     
Mass Units = [kg]
     
Solid Angle Units = [sr]
     
Temperature Units = [K]
     
Time Units = [s]
   
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Option Steady State
     EXTERNAL SOLVER COUPLING
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Option None
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R1
     Coord Frame 
Coord 0
     Domain Type 
Fluid
     Location 
Passage
     BOUNDARY
R1 Blade
       Boundary Type 
WALL
       Frame Type 
Rotating
       Location 
BLADE
       BOUNDARY CONDITIONS
:
         
HEAT TRANSFER:
           
Option Adiabatic
         END
         MASS 
AND MOMENTUM:
           
Option No Slip Wall
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         WALL ROUGHNESS
:
           
Option Smooth Wall
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     END
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R1 Hub
       Boundary Type 
WALL
       Frame Type 
Rotating
       Location 
HUB
       BOUNDARY CONDITIONS
:
         
HEAT TRANSFER:
           
Option Adiabatic
         END
         MASS 
AND MOMENTUM:
           
Option No Slip Wall
         END
         WALL ROUGHNESS
:
           
Option Smooth Wall
         END
       END
     END
     BOUNDARY
R1 Inlet
       Boundary Type 
INLET
       Frame Type 
Stationary
       Location 
INFLOW
       BOUNDARY CONDITIONS
:
         
FLOW DIRECTION:
           
Option Cylindrical Components
           Unit Vector Axial Component 
1
           Unit Vector Theta Component 
0
           Unit Vector r Component 
0
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         FLOW REGIME
:
           
Option Subsonic
         END
         HEAT TRANSFER
:
           
Option Stationary Frame Total Temperature
           Stationary Frame Total Temperature 
483.35 [K]
         
END
         MASS 
AND MOMENTUM:
           
Option Stationary Frame Total Pressure
           Relative Pressure 
195.218 [kPa]
         
END
         TURBULENCE
:
           
Option Medium Intensity and Eddy Viscosity Ratio
         END
       END
     END
     BOUNDARY
R1 Outlet
       Boundary Type 
OUTLET
       Frame Type 
Stationary
       Location 
OUTFLOW
       BOUNDARY CONDITIONS
:
         
FLOW REGIME:
           
Option Subsonic
         END
         MASS 
AND MOMENTUM:
           
Mass Flow Rate 0.10005 [kg s^-1]
           
Option Mass Flow Rate
         END
       END
     END
     BOUNDARY
R1 Shroud
       Boundary Type 
WALL
       Frame Type 
Rotating
       Location 
SHROUD
       BOUNDARY CONDITIONS
:
         
HEAT TRANSFER:
           
Option Adiabatic
         END
         MASS 
AND MOMENTUM:
           
Option No Slip Wall
           WALL VELOCITY
:
             
Option Counter Rotating Wall
           END
         END
         WALL ROUGHNESS
:
           
Option Smooth Wall
         END
       END
     END
     BOUNDARY
R1 to R1 Internal Side 1
       Boundary Type 
= INTERFACE
       
Location SHROUD TIP GGI SIDE 1
       BOUNDARY CONDITIONS
:
         
HEAT TRANSFER:
           
Option Conservative Interface Flux
         END
         MASS 
AND MOMENTUM:
           
Option Conservative Interface Flux
         END
         TURBULENCE
:
           
Option Conservative Interface Flux
         END
       END
     END
     BOUNDARY
R1 to R1 Internal Side 2
       Boundary Type 
= INTERFACE
       
Location SHROUD TIP GGI SIDE 2
       BOUNDARY CONDITIONS
:
         
HEAT TRANSFER:
           
Option Conservative Interface Flux
         END
         MASS 
AND MOMENTUM:
           
Option Conservative Interface Flux
         END
         TURBULENCE
:
           
Option Conservative Interface Flux
         END
       END
     END
     BOUNDARY
R1 to R1 Periodic 1 Side 1
       Boundary Type 
= INTERFACE
       
Location PER1
       BOUNDARY CONDITIONS
:
         
HEAT TRANSFER:
           
Option Conservative Interface Flux
         END
         MASS 
AND MOMENTUM:
           
Option Conservative Interface Flux
         END
         TURBULENCE
:
           
Option Conservative Interface Flux
         END
       END
     END
     BOUNDARY
R1 to R1 Periodic 1 Side 2
       Boundary Type 
= INTERFACE
       
Location PER2
       BOUNDARY CONDITIONS
:
         
HEAT TRANSFER:
           
Option Conservative Interface Flux
         END
         MASS 
AND MOMENTUM:
           
Option Conservative Interface Flux
         END
         TURBULENCE
:
           
Option Conservative Interface Flux
         END
       END
     END
     DOMAIN MODELS
:
       
BUOYANCY MODEL:
         
Option Non Buoyant
       END
       DOMAIN MOTION
:
         
Alternate Rotation Model true
         Angular Velocity 
26286 [rev min^-1]
         
Option Rotating
         AXIS DEFINITION
:
           
Option Coordinate Axis
           Rotation Axis 
Coord 0.1
         END
       END
       MESH DEFORMATION
:
         
Option None
       END
       REFERENCE PRESSURE
:
         
Reference Pressure [atm]
       
END
     END
     FLUID DEFINITION
Air Ideal Gas
       Material 
Air Ideal Gas
       Option 
Material Library
       MORPHOLOGY
:
         
Option Continuous Fluid
       END
     END
     FLUID MODELS
:
       
COMBUSTION MODEL:
         
Option None
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       HEAT TRANSFER MODEL
:
         Include 
Viscous Work Term On
         Option 
Total Energy
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       THERMAL RADIATION MODEL
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Option None
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       TURBULENCE MODEL
:
         
Option SST
       END
       TURBULENT WALL FUNCTIONS
:
         
High Speed Model On
         Option 
Automatic
       END
     END
   END
   DOMAIN 
INTERFACE: R1 to R1 Internal
     Boundary List1 
R1 to R1 Internal Side 1
     Boundary List2 
R1 to R1 Internal Side 2
     
Interface Type Fluid Fluid
     
INTERFACE MODELS:
       
Option General Connection
       FRAME CHANGE
:
         
Option None
       END
       MASS 
AND MOMENTUM:
         
Option Conservative Interface Flux
         MOMENTUM 
INTERFACE MODEL:
           
Option None
         END
       END
       PITCH CHANGE
:
         
Option None
       END
     END
     MESH CONNECTION
:
       
Option GGI
     END
   END
   DOMAIN 
INTERFACE: R1 to R1 Periodic 1
     Boundary List1 
R1 to R1 Periodic 1 Side 1
     Boundary List2 
R1 to R1 Periodic 1 Side 2
     
Interface Type Fluid Fluid
     
INTERFACE MODELS:
       
Option Rotational Periodicity
       AXIS DEFINITION
:
         
Option Coordinate Axis
         Rotation Axis 
Coord 0.1
       END
     END
     MESH CONNECTION
:
       
Option GGI
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   OUTPUT CONTROL
:
     
MONITOR OBJECTS:
       
MONITOR BALANCES:
         
Option Full
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       MONITOR FORCES
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Option Full
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       MONITOR PARTICLES
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Option None
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       MONITOR POINT
outletpressure
         Expression Value 
ave(Pressure)@R1 Outlet
         Option 
Expression
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Option Full
       END
       MONITOR TOTALS
:
         
Option Full
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     END
     RESULTS
:
       
Extra Output Variables List = Mach Number,Total Pressure,Total \
         
Pressure in Stn Frame,Total Temperature,Total Temperature in Stn \
         
Frame,Velocity in Stn Frame,Vorticity,Wall Shear,Temperature,Total \
         
Enthalpy in Stn Frame,Rotation Velocity
       File Compression Level 
= Default
       
Option Standard
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   SOLVER CONTROL
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Turbulence Numerics First Order
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Option High Resolution
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Length Scale Option Conservative
       Maximum Number of Iterations 
500
       Minimum Number of Iterations 
1
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Auto Timescale
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1
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Residual Target 0.000001
       Residual Type 
MAX
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     DYNAMIC MODEL CONTROL
:
       Global 
Dynamic Model Control On
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Version 13.0
   Results Version 
13.0
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EXECUTION CONTROL:
     
EXECUTABLE SELECTION:
       
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Runtime Priority Standard
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Memory Allocation Factor 1.0
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HOST DEFINITIONeTaEta
         Remote Host Name 
EtaEta
         Installation Root 
C:\Program Files\ANSYS Inc\v%v\CFX
         Host Architecture String 
winnt-amd64
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Multidomain Option Independent Partitioning
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Large Problem Partitioner Off
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MeTiS Type k-way
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MeTiS
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Automatic
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0.500000.50000
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Solver Input File = \
         
C:\Users\EtaEta\Base\base_v1_m_010005_new_002.res
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Full
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Runtime Priority Standard
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Memory Allocation Factor 1.0
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Number of Processes 2
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HP MPI Local Parallel
         Parallel Host 
List = eTaEta*2
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Old   December 8, 2011, 16:23
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Can you show what the problem is? It is not clear.

But if you are talking about the interfaces then that is just a post processing rendering thing. The underlying simulation should be the same. View both simulations with the same post processor and it should look the same.
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Old   December 8, 2011, 16:46
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If you look to the picture, you can see there is a clear shift in the middle.
Normally, two periodic interfaces should coincide and have same values.

It is a not a interface problem. I think there is a tolerance in the periodic side, whose default value is increased when switching from CFX 11 to CFX 13.

Thanks
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Old   December 8, 2011, 16:51
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As I said, I suspect it is a post processing issue. Have you compared the two runs on the same post processor? It might be rendered differently between V11 and V13.
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Old   December 8, 2011, 16:57
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Yes, I did. CFX 11 run has same velocities at periodic boundary in CFX 13 Post. But still, the run from CFX 13, in CFX 13 Post, shows slightly different velocities.

(CFX 11 Post does not accept the runs of CFX 13)
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Old   December 8, 2011, 17:15
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So that proves it, doesn't it? It is a post-processor rendering thing. The simulations are the same.
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