# static temperature more than total temperature ??

 User Name Remember Me Password
 Register Blogs Members List Search Today's Posts Mark Forums Read July 14, 2003, 05:12 static temperature more than total temperature ?? #1 mahesh Guest   Posts: n/a Hi All, We are getting static temperature more than total temperature ? has anybody came across such a situation ? why it happens ? we think physically it is not correct.. Please clarify.. Thanks in advance. Mahesh  July 15, 2003, 09:03 Re: static temperature more than total temperature #2 Mcgregor Guest   Posts: n/a Hi there, If you are annalysing the temperature in a flowing fluid, then i think this is the result you should expect as total temperature includes viscous heating effects. The two should only be slightly different though (no major differences) Mcgregor  July 17, 2003, 09:10 Re: static temperature more than total temperature #3 gelislim Guest   Posts: n/a Hi mahesh, Static temperature is the temperature of your fluid. That means when you use a temp. sensor you read the static temperature. On the other hand, total temperature (stagnation temperature)is the temperature your fluid has when it is decelerated to zero velocity isentropically and its kinetic energy is changed into internal energy. q : Is there any difference between their values ? a : yes, especialy in high speed flows. The higher the mach number of your flow the bigger the difference imnull and lakhvinder3113 like this.  June 21, 2009, 17:08 #4 Senior Member   Jack Join Date: Mar 2009 Posts: 106 Rep Power: 14 I´m simulating on a solid only domain and my results show that the static temperatures have greater results than the total temperatures, for a transient simulation. Why of this? I used the ANSYS Fluent 12 software. When i use ANSYS CFX 12, there is no option to export, in ANSYS CFX Pre, the total temperature results. How to export the total temperature to ANSYS CFX Post 12? LIBRARY: MATERIAL: Amostrak10Sol Material Group = CHT Solids,Particle Solids Option = Pure Substance Thermodynamic State = Solid PROPERTIES: Option = General Material EQUATION OF STATE: Density = 14900 [kg m^-3] Molar Mass = 1.0 [kg kmol^-1] Option = Value END SPECIFIC HEAT CAPACITY: Option = Value Specific Heat Capacity = 508.1237 [J kg^-1 K^-1] END THERMAL CONDUCTIVITY: Option = Value Thermal Conductivity = 73 [W m^-1 K^-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] END ANALYSIS TYPE: Option = Transient EXTERNAL SOLVER COUPLING: Option = None END INITIAL TIME: Option = Automatic with Value Time = 0 [s] END TIME DURATION: Option = Total Time Total Time = 110.778 [s] END TIME STEPS: Option = Timesteps Timesteps = 0.222 [s] END END DOMAIN: Default Domain Coord Frame = Coord 0 Domain Type = Solid Location = ASM.1 METAL BOUNDARY: Conveccaoo Boundary Type = WALL Location = ASM.1 CONVECCAOTOTAL BOUNDARY CONDITIONS: HEAT TRANSFER: Heat Transfer Coefficient = 20 [W m^-2 K^-1] Option = Heat Transfer Coefficient Outside Temperature = 29.34 [C] END END END BOUNDARY: Fluxoo Boundary Type = WALL Location = SOL_2D_REGION BOUNDARY CONDITIONS: HEAT TRANSFER: Heat Flux in = 1 [W m^-2] Option = Heat Flux END END END DOMAIN MODELS: DOMAIN MOTION: Option = Stationary END MESH DEFORMATION: Option = None END END INITIALISATION: Option = Automatic INITIAL CONDITIONS: TEMPERATURE: Option = Automatic with Value Temperature = 0 [C] END END END SOLID DEFINITION: Solid 1 Material = Amostrak10Sol Option = Material Library MORPHOLOGY: Option = Continuous Solid END END SOLID MODELS: HEAT TRANSFER MODEL: Option = Thermal Energy END THERMAL RADIATION MODEL: Option = None END END END OUTPUT CONTROL: MONITOR OBJECTS: MONITOR BALANCES: Option = Full END MONITOR FORCES: Option = Full END MONITOR PARTICLES: Option = Full END MONITOR POINT: T4 Cartesian Coordinates = 4.3 [mm], 3.5 [mm], 4.7 [mm] Option = Cartesian Coordinates Output Variables List = Temperature END MONITOR RESIDUALS: Option = Full END MONITOR TOTALS: Option = Full END END RESULTS: File Compression Level = Default Include Mesh = On Option = Selected Variables Output Variables List = Temperature END TRANSIENT RESULTS: Transient Results 1 File Compression Level = Default Include Mesh = On Option = Selected Variables Output Variables List = Temperature OUTPUT FREQUENCY: Option = Time Interval Time Interval = 0.222 [s] END END END SOLVER CONTROL: ADVECTION SCHEME: Option = High Resolution END CONVERGENCE CONTROL: Maximum Number of Coefficient Loops = 500 Minimum Number of Coefficient Loops = 1 Timescale Control = Coefficient Loops END CONVERGENCE CRITERIA: Residual Target = 0.000001 Residual Type = RMS END TRANSIENT SCHEME: Option = Second Order Backward Euler TIMESTEP INITIALISATION: Option = Automatic END END END END COMMAND FILE: Version = 12.0.1 Results Version = 12.0 END SIMULATION CONTROL: EXECUTION CONTROL: EXECUTABLE SELECTION: Double Precision = On END INTERPOLATOR STEP CONTROL: Runtime Priority = Standard MEMORY CONTROL: Memory Allocation Factor = 1.0 END END PARALLEL HOST LIBRARY: HOST DEFINITION: unifei Host Architecture String = winnt-amd64 Installation Root = C:\Program Files\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 Partition Weight Factors = 0.250, 0.250, 0.250, 0.250 END END RUN DEFINITION: Run Mode = Full Solver Input File = \ C:\0_CIBIM_Validacao_18_Junho_2009_cedo\Caso_Teste _CIBIM\CasoValidaca\ oCIBIM.def END SOLVER STEP CONTROL: Runtime Priority = High MEMORY CONTROL: Memory Allocation Factor = 1.0 END PARALLEL ENVIRONMENT: Number of Processes = 4 Start Method = HP MPI Local Parallel Parallel Host List = unifei*4 END END END END   May 18, 2016, 06:09 #5 Member   Marcel Jay Join Date: Jun 2014 Location: Berlin Posts: 52 Rep Power: 10 Well old Thread but since there is no clear answer I checked something in my CFX-Simulation: The Total Temperature seems to be only valid for the fluid domain, hence, the max. value in this domain is higher than the static "temperature" variable. In the solid domain though, the total temperature doesn't exist which is why the "temperature" can be higher. Assuming the heat source is in the solid.  Thread Tools Search this Thread Show Printable Version Email this Page Search this Thread: Advanced Search Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are Off Pingbacks are On Refbacks are On Forum Rules Similar Threads Thread Thread Starter Forum Replies Last Post NPU_conanxie Main CFD Forum 0 April 6, 2011 21:30 NPU_conanxie FLUENT 0 March 30, 2011 05:56 rogbrito CFX 1 June 21, 2009 18:37 Tomislav FLUENT 4 December 4, 2006 04:59 devy FLUENT 0 March 27, 2003 20:16

All times are GMT -4. The time now is 17:29.

 Contact Us - CFD Online - Privacy Statement - Top