# error using combination of step function

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 January 15, 2008, 07:19 error using combination of step function #1 xujjun Guest   Posts: n/a i want to set two bubble in initial condition, someone gave me a suggestion, the combination of step function is used, however,the cfx is terminal because of error,just like this: i do not know how to do? +--------------------------------------------------------------------+ | | | CFX Command Language for Run | | | +--------------------------------------------------------------------+ LIBRARY: CEL: EXPRESSIONS: DenH = 1000 [kg m^-3] DownH1 = 0.040 [m] Pres1 = DenH*g*DownH1 Rbubble1 = 0.001 [m] UpVFbubble1 = step(((0.0008 [m]^2-(x-0.0015 [m])^2-(z-0.0015 \ [m])^2))/1[m^2])+step(((0.0008 [m]^2-(x-0.0015 [m])^2-(z-0.0025 \ [m])^2))/1[m^2]) UpVFwater1 = 1-UpVFbubble1 dist1 = Rbubble1-sqrt((x-0.0025[m])^2+(z-0.002[m])^2) END END MATERIAL: Air at 25 C Material Description = Air at 25 C and 1 atm (dry) Material Group = Air Data, Constant Property Gases Option = Pure Substance Thermodynamic State = Gas PROPERTIES: Option = General Material Thermal Expansivity = 0.003356 [K^-1] ABSORPTION COEFFICIENT: Absorption Coefficient = 0.01 [m^-1] Option = Value END DYNAMIC VISCOSITY: Dynamic Viscosity = 1.831E-05 [kg m^-1 s^-1] Option = Value END EQUATION OF STATE: Density = 1.185 [kg m^-3] Molar Mass = 28.96 [kg kmol^-1] Option = Value END REFRACTIVE INDEX: Option = Value Refractive Index = 1.0 [m m^-1] END SCATTERING COEFFICIENT: Option = Value Scattering Coefficient = 0.0 [m^-1] END SPECIFIC HEAT CAPACITY: Option = Value Reference Pressure = 1 [atm] Reference Specific Enthalpy = 0. [J/kg] Reference Specific Entropy = 0. [J/kg/K] Reference Temperature = 25 [C] Specific Heat Capacity = 1.0044E+03 [J kg^-1 K^-1] Specific Heat Type = Constant Pressure END THERMAL CONDUCTIVITY: Option = Value Thermal Conductivity = 2.61E-02 [W m^-1 K^-1] END END END MATERIAL: Water Material Description = Water (liquid) Material Group = Water Data, Constant Property Liquids Option = Pure Substance Thermodynamic State = Liquid PROPERTIES: Option = General Material Thermal Expansivity = 2.57E-04 [K^-1] ABSORPTION COEFFICIENT: Absorption Coefficient = 1.0 [m^-1] Option = Value END DYNAMIC VISCOSITY: Dynamic Viscosity = 8.899E-4 [kg m^-1 s^-1] Option = Value END EQUATION OF STATE: Density = 997.0 [kg m^-3] Molar Mass = 18.02 [kg kmol^-1] Option = Value END REFRACTIVE INDEX: Option = Value Refractive Index = 1.0 [m m^-1] END SCATTERING COEFFICIENT: Option = Value Scattering Coefficient = 0.0 [m^-1] END SPECIFIC HEAT CAPACITY: Option = Value Reference Pressure = 1 [atm] Reference Specific Enthalpy = 0.0 [J/kg] Reference Specific Entropy = 0.0 [J/kg/K] Reference Temperature = 25 [C] Specific Heat Capacity = 4181.7 [J kg^-1 K^-1] Specific Heat Type = Constant Pressure END THERMAL CONDUCTIVITY: Option = Value Thermal Conductivity = 0.6069 [W m^-1 K^-1] END END END END EXECUTION CONTROL: PARALLEL HOST LIBRARY: HOST DEFINITION: b Installation Root = C:\CFXb\CFX-%v Host Architecture String = intel_pentium_winnt5.1 END END PARTITIONER STEP CONTROL: Multidomain Option = Coupled Partitioning Runtime Priority = Standard MEMORY CONTROL: Memory Allocation Factor = 1.0 END PARTITIONING TYPE: MeTiS Type = k-way Option = MeTiS Partition Size Rule = Automatic END END RUN DEFINITION: Definition File = D:/xjj/2bubble1.def Interpolate Initial Values = Off Run Mode = Full END SOLVER STEP CONTROL: Runtime Priority = Standard EXECUTABLE SELECTION: Double Precision = Off END MEMORY CONTROL: Memory Allocation Factor = 1.0 END PARALLEL ENVIRONMENT: Number of Processes = 1 Start Method = Serial END END END FLOW: DOMAIN: Domain 1 Coord Frame = Coord 0 Domain Type = Fluid Fluids List = Air at 25 C,Water Location = Assembly BOUNDARY: out Boundary Type = OPENING Location = OUTLET BOUNDARY CONDITIONS: FLOW DIRECTION: Option = Normal to Boundary Condition END FLOW REGIME: Option = Subsonic END MASS AND MOMENTUM: Option = Opening Pressure and Direction Relative Pressure = 0 [Pa] END END FLUID: Air at 25 C BOUNDARY CONDITIONS: VOLUME FRACTION: Option = Value Volume Fraction = 0 END END END FLUID: Water BOUNDARY CONDITIONS: VOLUME FRACTION: Option = Value Volume Fraction = 1 END END END END BOUNDARY: sym1 Boundary Type = SYMMETRY Location = FRONT END BOUNDARY: sym2 Boundary Type = SYMMETRY Location = BACK END BOUNDARY: Domain 1 Default Boundary Type = WALL Location = INLET,SURFS A,SURFS B BOUNDARY CONDITIONS: WALL INFLUENCE ON FLOW: Option = No Slip END END FLUID PAIR: Air at 25 C | Water BOUNDARY CONDITIONS: WALL ADHESION: Option = None END END END END DOMAIN MODELS: BUOYANCY MODEL: Buoyancy Reference Density = 1.185 [kg m^-3] Gravity X Component = 0 [m s^-2] Gravity Y Component = 0 [m s^-2] Gravity Z Component = -9.8 [m s^-2] Option = Buoyant BUOYANCY REFERENCE LOCATION: Option = Automatic END END DOMAIN MOTION: Option = Stationary END MESH DEFORMATION: Option = None END REFERENCE PRESSURE: Reference Pressure = 1 [atm] END END FLUID: Air at 25 C FLUID MODELS: FLUID BUOYANCY MODEL: Option = Density Difference END MORPHOLOGY: Option = Continuous Fluid END END END FLUID: Water FLUID MODELS: FLUID BUOYANCY MODEL: Option = Density Difference END MORPHOLOGY: Option = Continuous Fluid END END END FLUID MODELS: COMBUSTION MODEL: Option = None END HEAT TRANSFER MODEL: Fluid Temperature = 25 [C] Homogeneous Model = True Option = Isothermal END THERMAL RADIATION MODEL: Option = None END TURBULENCE MODEL: Option = Laminar END END FLUID PAIR: Air at 25 C | Water Surface Tension Coefficient = 0.07256 [N m^-1] INTERPHASE TRANSFER MODEL: Option = Free Surface END MASS TRANSFER: Option = None END SURFACE TENSION MODEL: Curvature Under Relaxation Factor = 0.25 Option = Continuum Surface Force Primary Fluid = Water Volume Fraction Smoothing Type = Volume-Weighted END END MULTIPHASE MODELS: Homogeneous Model = On FREE SURFACE MODEL: Option = Standard END END END INITIALISATION: Option = Automatic FLUID: Air at 25 C INITIAL CONDITIONS: VOLUME FRACTION: Option = Automatic with Value Volume Fraction = UpVFbubble1 END END END FLUID: Water INITIAL CONDITIONS: VOLUME FRACTION: Option = Automatic with Value Volume Fraction = UpVFwater1 END END END INITIAL CONDITIONS: Velocity Type = Cartesian CARTESIAN VELOCITY COMPONENTS: Option = Automatic with Value U = 0 [m s^-1] V = 0 [m s^-1] W = 0 [m s^-1] END STATIC PRESSURE: Option = Automatic with Value Relative Pressure = Pres1 END END END OUTPUT CONTROL: RESULTS: File Compression Level = Default Option = Standard END TRANSIENT RESULTS: Transient Results 1 File Compression Level = Default Option = Standard Time Interval = 0.002 [s] END END SIMULATION TYPE: Option = Transient INITIAL TIME: Option = Automatic with Value Time = 0 [s] END TIME DURATION: Option = Total Time Total Time = 1 [s] END TIME STEPS: Option = Timesteps Timesteps = 0.0001 [s] END END SOLUTION UNITS: Angle Units = [rad] Length Units = [m] Mass Units = [kg] Solid Angle Units = [sr] Temperature Units = [K] Time Units = [s] END SOLVER CONTROL: ADVECTION SCHEME: Option = High Resolution END CONVERGENCE CONTROL: Maximum Number of Coefficient Loops = 15 Timescale Control = Coefficient Loops END CONVERGENCE CRITERIA: Residual Target = 0.00001 Residual Type = RMS END TRANSIENT SCHEME: Option = Second Order Backward Euler END END END COMMAND FILE: Version = 10.0 Results Version = 10.0 END +--------------------------------------------------------------------+ | | | Solver | | | +--------------------------------------------------------------------+ +--------------------------------------------------------------------+ | | | ANSYS CFX Solver 10.0 | | | | Version 2005.07.11-10.24 Mon Jul 11 10:26:04 GMTDT 2005 | | | | Executable Attributes | | | | single-32bit-optimised-supfort-noprof-nospag-lcomp | | | | Copyright 1996-2005 ANSYS Europe Ltd. | +--------------------------------------------------------------------+ +--------------------------------------------------------------------+ | Job Information | +--------------------------------------------------------------------+ Run mode: serial run Host computer: B Job started: Mon Jan 14 14:29:22 2008 +--------------------------------------------------------------------+ | Memory Allocated for Run (Actual usage may be less) | +--------------------------------------------------------------------+ Data Type Kwords Words/Node Words/Elem Kbytes Bytes/Node Real 34615.5 432.69 884.15 135216.9 1730.78 Integer 6051.7 75.65 154.57 23639.5 302.59 Character 2442.3 30.53 62.38 2385.0 30.53 Logical 40.0 0.50 1.02 156.2 2.00 Double 477.8 5.97 12.20 3732.9 47.78 +--------------------------------------------------------------------+ | Total Number of Nodes, Elements, and Faces | +--------------------------------------------------------------------+ Domain Name : Domain 1 Total Number of Nodes = 80000 Total Number of Elements = 39151 Total Number of Hexahedrons = 39151 Total Number of Faces = 79998 +--------------------------------------------------------------------+ | Buoyancy Reference Information | +--------------------------------------------------------------------+ Domain Group: Domain 1 Buoyancy has been activated. The absolute pressure will include hydrostatic pressure contribution, using the following reference coordinates: ( 1.50000E-03, 5.00000E-05, 4.50000E-02). ---------------------------------- Error in subroutine GET_SPECVAR : Specified values for Water.Conservative Volume Fraction are out of bounds on Domain 1 GETVAR originally called by subroutine CAL_GVar +--------------------------------------------------------------------+ | Writing crash recovery file | +--------------------------------------------------------------------+ +--------------------------------------------------------------------+ | An error has occurred in cfx5solve: | | | | The CFX-5 solver could not be started, or exited with return code | | 255: . No results file has been created. | +--------------------------------------------------------------------+ End of solution stage. +--------------------------------------------------------------------+ | Warning! | | | | The CFX-5 Solver has written a crash recovery file. This file has | | been saved as D:\xjj\jingzhi\2bubble1_006.res.err and may be an | | aid to diagnosing the problem or restarting the run. More details | | should be available in the solver output section of the output | | file. Note that a lock file was left for the crash file when the | | solver exited, and so it is probably incomplete. | +--------------------------------------------------------------------+ +--------------------------------------------------------------------+ | The following user files have been saved in the directory | | D:\xjj\jingzhi\2bubble1_006: | | | | mon | +--------------------------------------------------------------------+ This run of the CFX-5 Solver has finished.

 January 15, 2008, 17:46 Re: error using combination of step function #2 Glenn Horrocks Guest   Posts: n/a Hi, The error message is saying your function is returning values which are out of bounds, that is smaller than 0 or greater than 1. Check the function to calculate the volume fraction. Glenn Horrocks

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