# combustion problem

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March 17, 2011, 16:45
combustion problem
#1
New Member

ser
Join Date: Feb 2011
Posts: 10
Rep Power: 6
I am facing this problem when i try to run the simulation of the combustion of a fluid inside a combustion chamber. If you help me i will really appreciate..

the error is shown below:
| |
| CFX Command Language for Run |
| |

LIBRARY:
MATERIAL: CO2
Material Description = Carbon Dioxide CO2
Material Group = Gas Phase Combustion
Option = Pure Substance
Thermodynamic State = Gas
PROPERTIES:
Option = General Material
EQUATION OF STATE:
Molar Mass = 44.01 [kg kmol^-1]
Option = Ideal Gas
END
BOUNDARY: Fuel in
Boundary Type = INLET
Location = F260.258
BOUNDARY CONDITIONS:
COMPONENT: H2O
Mass Fraction = 0.0
Option = Mass Fraction
END
COMPONENT: JetA
Mass Fraction = 0.98
Option = Mass Fraction
END
COMPONENT: O2
Mass Fraction = 0.0
Option = Mass Fraction
END
FLOW DIRECTION:
Option = Normal to Boundary Condition
END
FLOW REGIME:
Option = Subsonic
END
HEAT TRANSFER:
Option = Static Temperature
Static Temperature = 1500 [K]
END
MASS AND MOMENTUM:
Mass Flow Rate = 0.05833 [kg s^-1]
Option = Mass Flow Rate
END
TURBULENCE:
Option = Medium Intensity and Eddy Viscosity Ratio
END
END
END
BOUNDARY: Out
Boundary Type = OUTLET
Location = F255.258
BOUNDARY CONDITIONS:
FLOW REGIME:
Option = Subsonic
END
MASS AND MOMENTUM:
Normal Speed = 100 [ft s^-1]
Option = Normal Speed
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 = 450 [psi]
END
END
FLUID DEFINITION: Fluid 1
Option = Material Definition
MATERIAL DEFINITION:
Option = Reacting Mixture
END
MORPHOLOGY:
Option = Continuous Fluid
END
END
FLUID MODELS:
COMBUSTION MODEL:
Eddy Dissipation Model Coefficient A = 4.0
Eddy Dissipation Model Coefficient B = -1.0
Option = Eddy Dissipation
Reactions List = JetA Oxygen WD1
END
COMPONENT: CO2
Option = Constraint
END
COMPONENT: H2O
Option = Automatic
END
COMPONENT: JetA
Option = Automatic
END
COMPONENT: O2
Option = Automatic
END
HEAT TRANSFER MODEL:
Option = Thermal Energy
END
Option = None
END
TURBULENCE MODEL:
Option = k epsilon
END
TURBULENT WALL FUNCTIONS:
Option = Scalable
END
END
END
INITIALISATION:
Option = Automatic
INITIAL CONDITIONS:
Velocity Type = Cartesian
CARTESIAN VELOCITY COMPONENTS:
Option = Automatic with Value
U = 0 [m s^-1]
V = 0 [m s^-1]
W = 5 [m s^-1]
END
COMPONENT: H2O
Mass Fraction = 0.01
Option = Automatic with Value
END
COMPONENT: JetA
Mass Fraction = 0.01
Option = Automatic with Value
END
COMPONENT: O2
Mass Fraction = 0.023
Option = Automatic with Value
END
STATIC PRESSURE:
Option = Automatic with Value
Relative Pressure = 450 [psi]
END
TEMPERATURE:
Option = Automatic
END
TURBULENCE INITIAL CONDITIONS:
Option = Medium Intensity and Eddy Viscosity Ratio
END
END
END
OUTPUT CONTROL:
RESULTS:
File Compression Level = Default
Option = Standard
END
END
SOLVER CONTROL:
Turbulence Numerics = First Order
Option = High Resolution
END
CONVERGENCE CONTROL:
Maximum Number of Iterations = 100
Minimum Number of Iterations = 1
Physical Timescale = 0.025 [s]
Timescale Control = Physical Timescale
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 = 13.0
Results Version = 13.0
END
SIMULATION CONTROL:
EXECUTION CONTROL:
EXECUTABLE SELECTION:
Double Precision = Off
END
INTERPOLATOR STEP CONTROL:
Runtime Priority = Standard
MEMORY CONTROL:
Memory Allocation Factor = 1.0
END
END
PARALLEL HOST LIBRARY:
HOST DEFINITION: mcnair313
Host Architecture String = linux-amd64
Installation Root = /ansys_inc/v%v/CFX
END
END
PARTITIONER STEP CONTROL:
Multidomain Option = Independent Partitioning
Runtime Priority = Standard
EXECUTABLE SELECTION:
Use Large Problem Partitioner = Off
END
MEMORY CONTROL:
Memory Allocation Factor = 1.0
END
PARTITIONING TYPE:
MeTiS Type = k-way
Option = MeTiS
Partition Size Rule = Automatic
END
END
RUN DEFINITION:
Run Mode = Full
Solver Input File = Fluid Flow CFX.def
INITIAL VALUES SPECIFICATION:
INITIAL VALUES CONTROL:
Use Mesh From = Solver Input File
Continue History From = Workbench Initial Values
END
INITIAL VALUES: Workbench Initial Values
Option = Results File
File Name = Fluid Flow CFX_016.res
END
END
END
SOLVER STEP CONTROL:
Runtime Priority = Standard
MEMORY CONTROL:
Memory Allocation Factor = 1.0
END
PARALLEL ENVIRONMENT:
Number of Processes = 1
Start Method = Serial
END
END
END
END

+--------------------------------------------------------------------+
| |
| Interpolation of Initial Values |
| |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| |
| ANSYS CFX Interpolator 13.0 |
| |
| Version 2010.10.01-22.59 Sat Oct 2 00:12:45 BST 2010 |
| |
| Executable Attributes |
| |
| single-int32-64bit-novc8-noifort-novc6-optimised-supfort-noprof-nos|
| |
| Copyright 2010 ANSYS Inc. |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| Job Information |
+--------------------------------------------------------------------+

Run mode: serial run

Host computer: mcnair313 (PID:14321)
Job started: Thu Mar 17 16:36:46 2011

+--------------------------------------------------------------------+
| Memory Allocated for Run (Actual usage may be less) |
+--------------------------------------------------------------------+

Data Type Kwords Words/Node Words/Elem Kbytes Bytes/Node

Real 264.5 55.34 13.64 1033.3 221.37
Integer 352.8 73.80 18.19 1378.0 295.20
Character 200.0 41.84 10.31 195.3 41.84
Logical 10.0 2.09 0.52 39.1 8.37
Double 14.3 3.00 0.74 112.0 24.00

================================================== ====================
Interpolating Onto Domain "Default Domain"
================================================== ====================

Total Number of Nodes in the Target Domain = 4780
Bounding Box Volume of the Target Mesh = 4.43978E-03

Checking all source domains from the source file:
Target mesh is the same as domain "Default Domain".

Start direct copying of variables from domain "Default Domain".

+--------------------------------------------------------------------+
| Variable Range Information |
+--------------------------------------------------------------------+
+--------------------------------------------------------------------+
| Variable Name | min | max |
+--------------------------------------------------------------------+
| Isothermal Compressibility | 3.22E-07 | 3.22E-07 |
| Thermal Conductivity | 1.74E-02 | 1.74E-02 |
| Courant Number | 5.74E+00 | 2.46E+01 |
| Density | 8.84E+00 | 8.84E+00 |
| Isolated Volumes | 1.00E+00 | 2.00E+00 |
| Density Derivative wrt Pressure at Constant| 2.85E-06 | 2.85E-06 |
| Static Enthalpy | -5.29E+06 | -5.29E+06 |
| Static Entropy | 6.48E+03 | 6.48E+03 |
| H2O.Conservative Mass Fraction | 1.00E-02 | 1.00E-02 |
| JetA.Conservative Mass Fraction | 0.00E+00 | 0.00E+00 |
| O2.Conservative Mass Fraction | 2.32E-01 | 2.32E-01 |
| Pressure | 0.00E+00 | 0.00E+00 |
| Interpolation Source Domain | 0.00E+00 | 1.00E+00 |
| Specific Heat Capacity at Constant Pressure| 1.32E+03 | 1.32E+03 |
| Turbulence Eddy Dissipation | 4.42E+01 | 4.42E+01 |
| Temperature | 1.69E+03 | 1.69E+03 |
| Turbulence Kinetic Energy | 9.37E-02 | 9.38E-02 |
| Velocity | 5.00E+00 | 5.00E+00 |
| Dynamic Viscosity | 1.58E-05 | 1.58E-05 |
| Eddy Viscosity | 1.58E-04 | 1.58E-04 |

Details of error:-
Details of error:-
----------------
----------------
Error detected by routine MAKDAT
Error detected by routine MAKDAT
Illegal data area length CDANAM = NCOMPT CDTYPE = INTR ISIZE = 0
Illegal data area length CDANAM = NCOMPT CDTYPE = INTR ISIZE = 0
CRESLT = SIZE
CRESLT = SIZE

Current Directory : /INTERP/SOLUTION/DST/VX
Current Directory : /INTERP/SOLUTION/DST/VX

+================================================= ===================+
| ****** PROBLEM REPORT ****** |
|--------------------------------------------------------------------|
| Subsystem: Input and Output |
| Subroutine name: ErrAction |
| Severity level: Fatal Error |
| Error message number: 001100279 |
|--------------------------------------------------------------------|
| Message: |
| |
| Stopped in routine MEMERR |
| |=============+

+--------------------------------------------------------------------+
| An error has occurred in cfx5solve: |
| |
| Error interpolating results onto the new mesh: |
| /ansys_inc/v130/CFX/bin/linux-amd64/solver-pvm.exe exited with |
| return code 1. |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| The following user files have been saved in the directory |
| /root/.ansys/project final_15888_Working/dp0/CFX/CFX/Work1/Fluid |
| Flow CFX_019: |
| |
| job |
+--------------------------------------------------------------------+

This run of the ANSYS CFX Solver has finished.
Attached Images
 Screenshot.jpg (49.1 KB, 40 views)

 March 17, 2011, 21:01 #2 Senior Member   Bharath kumar Join Date: Apr 2009 Posts: 157 Rep Power: 8 It is clear that "Error interpolating results onto the new mesh".With out interpolation try to run . the memory required for interpolation may be high.so try to increase that.

March 17, 2011, 21:12
#3
New Member

ser
Join Date: Feb 2011
Posts: 10
Rep Power: 6
Quote:
 Originally Posted by bharath It is clear that "Error interpolating results onto the new mesh".With out interpolation try to run . the memory required for interpolation may be high.so try to increase that.
Where can i change the interpolation parameter?

 March 18, 2011, 09:49 #4 Senior Member   Bharath kumar Join Date: Apr 2009 Posts: 157 Rep Power: 8 it is in solver manager panel(show advanced control) .default is 1 you can increase it to 1.2 or 1.4

March 18, 2011, 10:45
#5
New Member

ser
Join Date: Feb 2011
Posts: 10
Rep Power: 6
Quote:
 Originally Posted by bharath it is in solver manager panel(show advanced control) .default is 1 you can increase it to 1.2 or 1.4
thanks a lot, i got, But now i have a new problem. When i try to run it it says this:

Fatal bounds error detected
---------------------------
Variable: Absolute Pressure
Locale : Default Domain Modified

+--------------------------------------------------------------------+
| Writing crash recovery file |
+--------------------------------------------------------------------+

Fatal bounds error detected
---------------------------
Variable: Density
Locale : Default Domain Modified

+--------------------------------------------------------------------+
| An error has occurred in cfx5solve: |
| |
| The ANSYS CFX solver exited with return code 1. No results file |
| has been created. |
+--------------------------------------------------------------------+

End of solution stage.

hope u can tell me how to solve it. thanks again

 March 18, 2011, 14:44 #6 Senior Member   Join Date: Mar 2009 Location: Europe Posts: 168 Rep Power: 8 What is your oxidiser? Air or pure oxygen? __________________ - - - - - ------------------------------------------------------------------------ Please do not forget: I am not paid for answering your questions. Thousands of issues can cause a division by zero. Please do not capture a thread, with the argument: "I have the same issue ...."

March 21, 2011, 08:35
#7
New Member

ser
Join Date: Feb 2011
Posts: 10
Rep Power: 6
Quote:
 Originally Posted by joey2007 What is your oxidiser? Air or pure oxygen?
Hello joey 2007,

my oxidiser is pure oxygen, with masss fraction of 0.21

 March 21, 2011, 15:20 #8 Senior Member   Join Date: Mar 2009 Location: Europe Posts: 168 Rep Power: 8 Can not believe: really no nitrogen????? __________________ - - - - - ------------------------------------------------------------------------ Please do not forget: I am not paid for answering your questions. Thousands of issues can cause a division by zero. Please do not capture a thread, with the argument: "I have the same issue ...."

March 22, 2011, 09:37
#9
New Member

ser
Join Date: Feb 2011
Posts: 10
Rep Power: 6
Quote:
 Originally Posted by joey2007 Can not believe: really no nitrogen?????
nitrogen 0.79

Last edited by mcnair; March 22, 2011 at 11:55.

 March 22, 2011, 15:06 #10 Senior Member   Join Date: Mar 2009 Location: Europe Posts: 168 Rep Power: 8 In the CCL snippet above I see no N2. Set it up as additional material either in the reaction or the material. Use it as constraint. In general CO2 will be zero in some parts of combustion domains. Thats not appropriate for a constraint variable and should be prevented when possible. __________________ - - - - - ------------------------------------------------------------------------ Please do not forget: I am not paid for answering your questions. Thousands of issues can cause a division by zero. Please do not capture a thread, with the argument: "I have the same issue ...."

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