Simulating Hagen Poiseuille flow through a pipe in OpenFOAM - English

Questions posted on ST Forums:

• Calculation of the Entrance Length of the pipe

  At time stamp 2:38 while calculating the Entrance length you have used 0.06  in multiplying , what does that signifies 

  02-03M 30-40S disin9856@gmail.com
  
  
  Answer last updated on: Feb. 6, 2024, 11:34 a.m.

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• Unable to locate transportProperties file

  I am unable to open transportProperties file from constant folder, as it is unable to locate. However, gedit opens blank text file. Please help. 

  08-09M 0-10S purbeyprashant
  
  
  Answer last updated on: Nov. 11, 2022, 7:51 p.m.

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• error icofoam

  Im getting the following error while working with icofoam (2nd time)fileModificationChecking : Monitoring run-time modified files using timeStampMaster (fileModificationSkew 10)allowSystemOperations : Allowing user-supplied system call operations// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //Create timefileName::stripInvalid() called for invalid fileName NewFolder    For debug level (= 2) > 1 this is considered fatalAborted (core dumped)(NB :....run/pipe$ ls 0   4   5   cavity   constant  'New Folder'   system   tutorials)What should i do?

  11-12M 40-50S ITURHS
  
  
  Answer last updated on: Feb. 27, 2021, 9:43 a.m.

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• Zero Gradient

  What do we mean exactly mean by Zero Gradient? 

  03-04M 10-20S Hirushi_07
  
  
  Answer last updated on: Feb. 26, 2021, 9:46 p.m.

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• Error While running blockMesh

  I am getting the following error while executing the blockMesh command.FOAM FATAL ERROR: cannot find file "/home/prinux/OpenFOAM/prinux-8/run/pipe/0/p" From function virtual Foam::autoPtr<Foam::ISstream> Foam::fileOperations::uncollatedFileOperation::readStream(Foam::regIOobject&, const Foam::fileName&, const Foam::word&, bool) const in file global/fileOperations/uncollatedFileOperation/uncollatedFileOperation.C at line 538. FOAM exiting

  07-08M 20-30S subhamdas
  
  
  Answer last updated on: Sept. 26, 2020, 4:12 p.m.

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• Error while running solver "icoFoam"

  This is the Error that i am getting after running solver "solver". Solver crashes after some time.Courant Number mean: 32.084 max: 1334.68#0  Foam::error::printStack(Foam::Ostream&) at ??:?#1  Foam::sigFpe::sigHandler(int) at ??:?#2  ? in "/lib/x86_64-linux-gnu/libc.so.6"#3  Foam::symGaussSeidelSmoother::smooth(Foam::word const&, Foam::Field<double>&, Foam::lduMatrix const&, Foam::Field<double> const&, Foam::FieldField<Foam::Field, double> const&, Foam::UPtrList<Foam::lduInterfaceField const> const&, unsigned char, int) at ??:?#4  Foam::symGaussSeidelSmoother::smooth(Foam::Field<double>&, Foam::Field<double> const&, unsigned char, int) const at ??:?#5  Foam::smoothSolver::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const at ??:?#6  ? in "/opt/openfoam8/platforms/linux64GccDPInt32Opt/bin/icoFoam"#7  ? in "/opt/openfoam8/platforms/linux64GccDPInt32Opt/bin/icoFoam"#8  ? in "/opt/openfoam8/platforms/linux64GccDPInt32Opt/bin/icoFoam"#9  ? in "/opt/openfoam8/platforms/linux64GccDPInt32Opt/bin/icoFoam"#10  __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"#11  ? in "/opt/openfoam8/platforms/linux64GccDPInt32Opt/bin/icoFoam"

  09-10M 30-40S Shubhanshu_rai
  
  
  Answer last updated on: Sept. 26, 2020, 3:46 p.m.

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• entrance length and geometry length

   Can we use the same length we get from this formula for simulation?

  02-03M 30-40S sagarsinghal
  
  
  Answer last updated on: Sept. 26, 2020, 9:10 a.m.

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• Increase end time

  Can we increase end time? Will that change our results?

  09-10M 30-40S kannanbt
  
  
  Answer last updated on: Sept. 25, 2020, 8:24 p.m.

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• Error while running the simulation

  I am facing an error below while running the simulation. Did I miss anything?Time = 0.08Courant Number mean: 608.301 max: 48546.8#0  Foam::error::printStack(Foam::Ostream&) at ??:?#1  Foam::sigFpe::sigHandler(int) at ??:?#2  ? in "/lib/x86_64-linux-gnu/libc.so.6"#3  Foam::symGaussSeidelSmoother::smooth(Foam::word const&, Foam::Field<double>&, Foam::lduMatrix const&, Foam::Field<double> const&, Foam::FieldField<Foam::Field, double> const&, Foam::UPtrList<Foam::lduInterfaceField const> const&, unsigned char, int) at ??:?#4  Foam::symGaussSeidelSmoother::smooth(Foam::Field<double>&, Foam::Field<double> const&, unsigned char, int) const at ??:?#5  Foam::smoothSolver::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const at ??:?#6  ? in "/opt/openfoam7/platforms/linux64GccDPInt32Opt/bin/icoFoam"#7  ? in "/opt/openfoam7/platforms/linux64GccDPInt32Opt/bin/icoFoam"#8  ? in "/opt/openfoam7/platforms/linux64GccDPInt32Opt/bin/icoFoam"#9  ? in "/opt/openfoam7/platforms/linux64GccDPInt32Opt/bin/icoFoam"#10  __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"#11  ? in "/opt/openfoam7/platforms/linux64GccDPInt32Opt/bin/icoFoam"Floating point exception (core dumped)

  11-12M 30-40S hbammkanti
  
  
  Answer last updated on: Sept. 23, 2020, 12:47 p.m.

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• What happens if we keep purgeWrite value 0?

  Can I keep purgeWrite value = 0? how will this affect the simulation results?

  10-11M 30-40S hbammkanti
  
  
  Answer last updated on: Sept. 23, 2020, 12:44 p.m.

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• From where did you get the OpenFOAM results?

  You say that OpenFOAM gives velocity as 0.05m/s and pressure as 2.8 Pa.  From where did you get these values? 

  12-13M 0-10S kannan
  
  
  Answer last updated on: Sept. 18, 2020, 9:34 a.m.

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