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March 17, 2011, 16:45 |
combustion problem
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#1 |
New Member
ser
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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 THERMAL RADIATION MODEL: 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 ADVECTION SCHEME: 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. |
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March 17, 2011, 21:01 |
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#2 |
Senior Member
Bharath kumar
Join Date: Apr 2009
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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.
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March 17, 2011, 21:12 |
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#3 |
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ser
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March 18, 2011, 09:49 |
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#4 |
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Bharath kumar
Join Date: Apr 2009
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it is in solver manager panel(show advanced control) .default is 1 you can increase it to 1.2 or 1.4
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March 18, 2011, 10:45 |
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#5 | |
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ser
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Quote:
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 |
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March 18, 2011, 14:44 |
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#6 |
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What is your oxidiser? Air or pure oxygen?
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March 21, 2011, 08:35 |
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#7 |
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ser
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March 21, 2011, 15:20 |
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#8 |
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Can not believe: really no nitrogen?????
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March 22, 2011, 09:37 |
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#9 |
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ser
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Last edited by mcnair; March 22, 2011 at 11:55. |
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March 22, 2011, 15:06 |
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#10 |
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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.
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