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-   -   Table bounds warnings at: END OF TIME STEP (https://www.cfd-online.com/Forums/cfx/228823-table-bounds-warnings-end-time-step.html)

 CFXer July 16, 2020 06:54

Table bounds warnings at: END OF TIME STEP

I am using an SCO2 RGP table that goes from 7.377MPa to 8.5 MPa. My minimum pressure in my simulation is ~7.991MPa, max is 8.025 MPa. I'm getting an out of bounds error for absolute pressure. Does this have anything to do with my reference pressure? I set it for the outlet pressure of 7.991MPa Why would it tell me out of bounds when it isn't? Everything looks to make sense in the results as far as I can tell.

Here is what the table bounds errors look like:
+--------------------------------------------------------------------+
| Table bounds warnings at: END OF TIME STEP |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| |
| Independent variables went out of bounds while computing the |
| variables listed below using table interpolation. In each case |
| the bounds error was handled by clipping or extrapolation. |
| If this situation persists, consider increasing the table range. |
| |
+--------------------------------------------------------------------+
| |
| Location Name : inlet_pipe_upper |
| Mesh location : VERTICES |
| Routine : CAL_GVar |
| Partition : 1 |
| Variable Name : Local Speed of Sound |
| Ind. Variable : Absolute Pressure |
| Bound : Lower |
| Min Value : 7.9080E+04 |
| Handled By : Clipping |
| |
+--------------------------------------------------------------------+
| |
| Location Name : inlet_pipe_upper |
| Mesh location : VERTICES |
| Routine : CAL_GVar |
| Partition : 1 |
| Variable Name : Static Enthalpy |
| Ind. Variable : Absolute Pressure |
| Bound : Lower |
| Min Value : 7.9171E+04 |
| Handled By : Clipping |
| |
+--------------------------------------------------------------------+

....

+--------------------------------------------------------------------+
| |
| Location Name : inlet_header |
| Mesh location : VERTICES |
| Routine : RES_UPDATE_CPL |
| Partition : 17 |
| Variable Name : Local Speed of Sound |
| Ind. Variable : Absolute Pressure |
| Bound : Lower |
| Min Value : 7.8964E+04 |
| Handled By : Clipping |
| |
+--------------------------------------------------------------------+
| |
| Location Name : outlet |
| Mesh location : VERTICES |
| Routine : RES_UPDATE_CPL |
| Partition : 12 |
| Variable Name : Local Speed of Sound |
| Ind. Variable : Absolute Pressure |
| Bound : Lower |
| Min Value : 5.7072E+04 |
| Handled By : Clipping |
| |
+--------------------------------------------------------------------+
| |
| Location Name : core |
| Mesh location : VERTICES |
| Routine : RES_UPDATE_CPL |
| Partition : 13 |
| Variable Name : Local Speed of Sound |
| Ind. Variable : Absolute Pressure |
| Bound : Lower |
| Min Value : 7.6115E+04 |
| Handled By : Clipping |
| |
+--------------------------------------------------------------------+

Long List of these. All saying independent variable is absolute pressure or static enthalpy.

In my simulation, the inlet velocity condition is about 6 m/s.

I can't understand why this error occurs, and I want to know how can I solve this error.

 Stel July 16, 2020 07:27

Yes, maybe you have some problems with your reference pressure, but it is hard to tell only from the error log. Could you post the beginning of your out file (the "CFX Command Language for Run" part) so we can have a look at your setup?

 CFXer July 16, 2020 20:18

Quote:
 Originally Posted by Stel (Post 777902) Yes, maybe you have some problems with your reference pressure, but it is hard to tell only from the error log. Could you post the beginning of your out file (the "CFX Command Language for Run" part) so we can have a look at your setup?
Yes, here is the log, but quite a long.

+--------------------------------------------------------------------+
| |
| CFX Command Language for Run |
| |
+--------------------------------------------------------------------+

LIBRARY:
CEL:
EXPRESSIONS:
Re = density*((sqrt(u^2)+sqrt(v^2)+sqrt(w^2))/3)*0.733[mm]/viscosity
END
END
MATERIAL: SCO2
Material Group = User
Option = Pure Substance
Thermodynamic State = Gas
PROPERTIES:
Component Name = CO2
Option = Table
Table Format = TASCflow RGP
Table Name = /home/jungsungsuk/SCO2RGP/SCO2.rgp
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]
END
ANALYSIS TYPE:
Option = Steady State
EXTERNAL SOLVER COUPLING:
Option = None
END
END
DOMAIN: core
Coord Frame = Coord 0
Domain Type = Porous
Location = SOLID 5
BOUNDARY: core_outlet_header Side 1
Boundary Type = INTERFACE
Location = OUTLET_CORE
BOUNDARY CONDITIONS:
MASS AND MOMENTUM:
Option = Conservative Interface Flux
END
TURBULENCE:
Option = Conservative Interface Flux
END
END
END
BOUNDARY: header_core Side 2
Boundary Type = INTERFACE
Location = INLET_CORE
BOUNDARY CONDITIONS:
MASS AND MOMENTUM:
Option = Conservative Interface Flux
END
TURBULENCE:
Option = Conservative Interface Flux
END
END
END
BOUNDARY: wall_bottom
Boundary Type = WALL
Location = WALL_BOTTOM_CORE
BOUNDARY CONDITIONS:
MASS AND MOMENTUM:
Option = Free Slip Wall
END
END
END
BOUNDARY: wall_side
Boundary Type = WALL
Location = WALL_SIDE_CORE
BOUNDARY CONDITIONS:
MASS AND MOMENTUM:
Option = Free Slip Wall
END
END
END
BOUNDARY: wall_upper
Boundary Type = WALL
Location = WALL_UPPER_CORE
BOUNDARY CONDITIONS:
MASS AND MOMENTUM:
Option = Free Slip Wall
END
END
END
DOMAIN MODELS:
BUOYANCY MODEL:
Option = Non Buoyant
END
DOMAIN MOTION:
Option = Stationary
END
MESH DEFORMATION:
Option = None
END
REFERENCE PRESSURE:
Reference Pressure = 7.991 [kPa]
END
END
FLUID DEFINITION: Fluid 1
Material = SCO2
Option = Material Library
MORPHOLOGY:
Option = Continuous Fluid
END
END
FLUID MODELS:
COMBUSTION MODEL:
Option = None
END
HEAT TRANSFER MODEL:
Fluid Temperature = 76.2 [C]
Option = Isothermal
END
Option = None
END
TURBULENCE MODEL:
Option = SST
END
TURBULENT WALL FUNCTIONS:
Option = Automatic
END
END
POROSITY MODELS:
AREA POROSITY:
Option = Isotropic
END
LOSS MODEL:
Loss Velocity Type = True Velocity
Option = Isotropic Loss
ISOTROPIC LOSS MODEL:
Option = Permeability and Loss Coefficient
Resistance Loss Coefficient = (0.79*ln(Re)-1.64)^(-2)/0.733[mm]
END
END
VOLUME POROSITY:
Option = Value
Volume Porosity = 0.1004021027
END
END
END
Coord Frame = Coord 0
Domain Type = Fluid
Location = SOLID 3
BOUNDARY: bottompipe_header Side 2
Boundary Type = INTERFACE
BOUNDARY CONDITIONS:
MASS AND MOMENTUM:
Option = Conservative Interface Flux
END
TURBULENCE:
Option = Conservative Interface Flux
END
END
END
BOUNDARY: header_core Side 1
Boundary Type = INTERFACE
BOUNDARY CONDITIONS:
MASS AND MOMENTUM:
Option = Conservative Interface Flux
END
TURBULENCE:
Option = Conservative Interface Flux
END
END
END
BOUNDARY: upperpipe_header Side 2
Boundary Type = INTERFACE
BOUNDARY CONDITIONS:
MASS AND MOMENTUM:
Option = Conservative Interface Flux
END
TURBULENCE:
Option = Conservative Interface Flux
END
END
END
Boundary Type = WALL
BOUNDARY CONDITIONS:
MASS AND MOMENTUM:
Option = No Slip Wall
END
WALL ROUGHNESS:
Option = Smooth Wall
END
END
END
DOMAIN MODELS:
BUOYANCY MODEL:
Option = Non Buoyant
END
DOMAIN MOTION:
Option = Stationary
END
MESH DEFORMATION:
Option = None
END
REFERENCE PRESSURE:
Reference Pressure = 7.991 [kPa]
END
END
FLUID DEFINITION: Fluid 1
Material = SCO2
Option = Material Library
MORPHOLOGY:
Option = Continuous Fluid
END
END
FLUID MODELS:
COMBUSTION MODEL:
Option = None
END
HEAT TRANSFER MODEL:
Fluid Temperature = 76.2 [C]
Option = Isothermal
END
Option = None
END
TURBULENCE MODEL:
Option = SST
END
TURBULENT WALL FUNCTIONS:
Option = Automatic
END
END
END
DOMAIN: inlet_pipe_bottom
Coord Frame = Coord 0
Domain Type = Fluid
Location = SOLID
BOUNDARY: bottompipe_header Side 1
Boundary Type = INTERFACE
Location = OUTLET_BOTTOM_PIPE
BOUNDARY CONDITIONS:
MASS AND MOMENTUM:
Option = Conservative Interface Flux
END
TURBULENCE:
Option = Conservative Interface Flux
END
END
END
BOUNDARY: inlet_inlet_pipe_bottom
Boundary Type = INLET
Location = INLET_BOTTOM_PIPE
BOUNDARY CONDITIONS:
FLOW DIRECTION:
Option = Normal to Boundary Condition
END
FLOW REGIME:
Option = Subsonic
END
MASS AND MOMENTUM:
Mass Flow Rate = 6.275 [kg s^-1]
Mass Flow Rate Area = As Specified
Option = Mass Flow Rate
END
TURBULENCE:
Option = Medium Intensity and Eddy Viscosity Ratio
END
END
END
BOUNDARY: wall_inlet_pipe_bottom
Boundary Type = WALL
Location = WALL_BOTTOM_PIPE
BOUNDARY CONDITIONS:
MASS AND MOMENTUM:
Option = No Slip Wall
END
WALL ROUGHNESS:
Option = Smooth Wall
END
END
END
DOMAIN MODELS:
BUOYANCY MODEL:
Option = Non Buoyant
END
DOMAIN MOTION:
Option = Stationary
END
MESH DEFORMATION:
Option = None
END
REFERENCE PRESSURE:
Reference Pressure = 7.991 [kPa]
END
END
FLUID DEFINITION: Fluid 1
Material = SCO2
Option = Material Library
MORPHOLOGY:
Option = Continuous Fluid
END
END
FLUID MODELS:
COMBUSTION MODEL:
Option = None
END
HEAT TRANSFER MODEL:
Fluid Temperature = 76.2 [C]
Option = Isothermal
END
Option = None
END
TURBULENCE MODEL:
Option = SST
END
TURBULENT WALL FUNCTIONS:
Option = Automatic
END
END
END
DOMAIN: inlet_pipe_upper
Coord Frame = Coord 0
Domain Type = Fluid
Location = SOLID 2
Boundary Type = INLET
Location = INLET_UPPER_PIPE
BOUNDARY CONDITIONS:
FLOW DIRECTION:
Option = Normal to Boundary Condition
END
FLOW REGIME:
Option = Subsonic
END
MASS AND MOMENTUM:
Mass Flow Rate = 6.275 [kg s^-1]
Mass Flow Rate Area = As Specified
Option = Mass Flow Rate
END
TURBULENCE:
Option = Medium Intensity and Eddy Viscosity Ratio
END
END
END
BOUNDARY: upperpipe_header Side 1
Boundary Type = INTERFACE
Location = OUTLET_UPPER_PIPE
BOUNDARY CONDITIONS:
MASS AND MOMENTUM:
Option = Conservative Interface Flux
END
TURBULENCE:
Option = Conservative Interface Flux
END
END
END
Boundary Type = WALL
Location = WALL_UPPER_PIPE
BOUNDARY CONDITIONS:
MASS AND MOMENTUM:
Option = No Slip Wall
END
WALL ROUGHNESS:
Option = Smooth Wall
END
END
END
DOMAIN MODELS:
BUOYANCY MODEL:
Option = Non Buoyant
END
DOMAIN MOTION:
Option = Stationary
END
MESH DEFORMATION:
Option = None
END
REFERENCE PRESSURE:
Reference Pressure = 7.991 [kPa]
END
END
FLUID DEFINITION: Fluid 1
Material = SCO2
Option = Material Library
MORPHOLOGY:
Option = Continuous Fluid
END
END
FLUID MODELS:
COMBUSTION MODEL:
Option = None
END
HEAT TRANSFER MODEL:
Fluid Temperature = 76.2 [C]
Option = Isothermal
END
Option = None
END
TURBULENCE MODEL:
Option = SST
END
TURBULENT WALL FUNCTIONS:
Option = Automatic
END
END
END
DOMAIN: outlet
Coord Frame = Coord 0
Domain Type = Fluid
Location = SOLID 4
BOUNDARY: core_outlet_header Side 2
Boundary Type = INTERFACE
BOUNDARY CONDITIONS:
MASS AND MOMENTUM:
Option = Conservative Interface Flux
END
TURBULENCE:
Option = Conservative Interface Flux
END
END
END
Boundary Type = OUTLET
Location = OUTLET_OUTLET_PIPE
BOUNDARY CONDITIONS:
FLOW REGIME:
Option = Subsonic
END
MASS AND MOMENTUM:
Option = Average Static Pressure
Pressure Profile Blend = 0.05
Relative Pressure = 0 [Pa]
END
PRESSURE AVERAGING:
Option = Average Over Whole Outlet
END
END
END
BOUNDARY: wall
Boundary Type = WALL
Location = \
IPE
BOUNDARY CONDITIONS:
MASS AND MOMENTUM:
Option = No Slip Wall
END
WALL ROUGHNESS:
Option = Smooth Wall
END
END
END
DOMAIN MODELS:
BUOYANCY MODEL:
Option = Non Buoyant
END
DOMAIN MOTION:
Option = Stationary
END
MESH DEFORMATION:
Option = None
END
REFERENCE PRESSURE:
Reference Pressure = 7.991 [kPa]
END
END
FLUID DEFINITION: Fluid 1
Material = SCO2
Option = Material Library
MORPHOLOGY:
Option = Continuous Fluid
END
END
FLUID MODELS:
COMBUSTION MODEL:
Option = None
END
HEAT TRANSFER MODEL:
Fluid Temperature = 76.2 [C]
Option = Isothermal
END
Option = None
END
TURBULENCE MODEL:
Option = SST
END
TURBULENT WALL FUNCTIONS:
Option = Automatic
END
END
END
Boundary List1 = bottompipe_header Side 1
Boundary List2 = bottompipe_header 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
Boundary List1 = core_outlet_header Side 1
Boundary List2 = core_outlet_header Side 2
Interface Type = Fluid Porous
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
Boundary List1 = header_core Side 1
Boundary List2 = header_core Side 2
Interface Type = Fluid Porous
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
Boundary List1 = upperpipe_header Side 1
Boundary List2 = upperpipe_header 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
OUTPUT CONTROL:
MONITOR OBJECTS:
MONITOR BALANCES:
Option = Full
END
MONITOR FORCES:
Option = Full
END
MONITOR PARTICLES:
Option = Full
END
MONITOR POINT: bottom inlet P
Cartesian Coordinates = 0 [m], -1.135 [m], 0.0972 [m]
Coord Frame = Coord 0
Option = Cartesian Coordinates
Output Variables List = Absolute Pressure
MONITOR LOCATION CONTROL:
Interpolation Type = Nearest Vertex
END
POSITION UPDATE FREQUENCY:
Option = Initial Mesh Only
END
END
MONITOR POINT: bottom inlet u
Cartesian Coordinates = 0 [m], -1.135 [m], 0.0972 [m]
Coord Frame = Coord 0
Option = Cartesian Coordinates
Output Variables List = Vorticity
MONITOR LOCATION CONTROL:
Interpolation Type = Nearest Vertex
END
POSITION UPDATE FREQUENCY:
Option = Initial Mesh Only
END
END
MONITOR POINT: outlet P
Cartesian Coordinates = 0 [m], -0.3175 [m], -1.333 [m]
Coord Frame = Coord 0
Option = Cartesian Coordinates
Output Variables List = Absolute Pressure
MONITOR LOCATION CONTROL:
Interpolation Type = Nearest Vertex
END
POSITION UPDATE FREQUENCY:
Option = Initial Mesh Only
END
END
MONITOR POINT: outlet u
Cartesian Coordinates = 0 [m], -0.3175 [m], -1.333 [m]
Coord Frame = Coord 0
Option = Cartesian Coordinates
Output Variables List = Velocity
MONITOR LOCATION CONTROL:
Interpolation Type = Nearest Vertex
END
POSITION UPDATE FREQUENCY:
Option = Initial Mesh Only
END
END
MONITOR POINT: up inlet P
Cartesian Coordinates = 0 [m], 0.5 [m], 0.0972 [m]
Coord Frame = Coord 0
Option = Cartesian Coordinates
Output Variables List = Absolute Pressure
MONITOR LOCATION CONTROL:
Interpolation Type = Nearest Vertex
END
POSITION UPDATE FREQUENCY:
Option = Initial Mesh Only
END
END
MONITOR POINT: up inlet u
Cartesian Coordinates = 0 [m], 0.5 [m], 0.0972 [m]
Coord Frame = Coord 0
Option = Cartesian Coordinates
Output Variables List = Velocity
MONITOR LOCATION CONTROL:
Interpolation Type = Nearest Vertex
END
POSITION UPDATE FREQUENCY:
Option = Initial Mesh Only
END
END
MONITOR RESIDUALS:
Option = Full
END
MONITOR TOTALS:
Option = Full
END
END
RESULTS:
File Compression Level = Default
Option = Standard
END
END
SOLVER CONTROL:
Turbulence Numerics = First Order
Option = High Resolution
END
CONVERGENCE CONTROL:
Length Scale Option = Conservative
Maximum Number of Iterations = 100000
Minimum Number of Iterations = 1000
Timescale Control = Auto Timescale
Timescale Factor = 1.0
END
CONVERGENCE CRITERIA:
Residual Target = 1.E-4
Residual Type = RMS
END
DYNAMIC MODEL CONTROL:
Global Dynamic Model Control = On
END
END
END
COMMAND FILE:
Version = 16.2
Results Version = 16.2
END
SIMULATION CONTROL:
EXECUTION CONTROL:
EXECUTABLE SELECTION:
Double Precision = Yes
END
PARALLEL HOST LIBRARY:
HOST DEFINITION: node07
Host Architecture String = linux-amd64
Installation Root = /APP/ansys_inc/v%v/CFX
END
END
PARTITIONER STEP CONTROL:
PARTITIONING TYPE:
Option = MeTiS
MeTiS Type = k-way
Partition Size Rule = Automatic
Partition Weight Factors = 0.08333, 0.08333, 0.08333, 0.08333, \
0.08333, 0.08333, 0.08333, 0.08333, 0.08333, 0.08333, 0.08333, \
0.08333
END
END
RUN DEFINITION:
Solver Input File = \
/home/jungsungsuk/Airfoil_total_practice_2/1-4.inlet_to_outlet_straig\
ht.def
Run Mode = Full
Solver Results File = \
/home/jungsungsuk/Airfoil_total_practice_2/i1-4inlet_to_outlet_straig\
ht_001.res
END
SOLVER STEP CONTROL:
PARALLEL ENVIRONMENT:
Start Method = Platform MPI Local Parallel
Number of Processes = 12
Parallel Host List = node07*12
END
END
END
END

 Stel July 16, 2020 20:44

Your reference pressure (7.991 [kPa]) is quite low for the range of your table (7.377MPa to 8.5 MPa), and I don't see any non-zero relative pressure being set anywhere; there is a 0 [Pa] pressure set at OUTLET_OUTLET_PIPE. If the absolute pressure at OUTLET_OUTLET_PIPE should be 7.991MPa, so my advice is to set your reference pressure to 7.991MPa (not 7.991 [kPa]) and keep the relative pressure at OUTLET_OUTLET_PIPE at 0 [Pa].

 CFXer July 16, 2020 23:44

Oh, I had a mistake.
Thank you very much!

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