|
[Sponsors] |
April 11, 2011, 14:49 |
Inlet and Outlet
|
#1 |
New Member
Luis Blanes
Join Date: Mar 2011
Location: Cardiff. UK.
Posts: 12
Rep Power: 15 |
Hi All
I am trying to setup a simple case with an Inlet and an Outlet. I am used to WinAir, where you only input a Volumetric Flow (m3/s) and a directional Vector. I am reviewing the Derived Patch Field Types...but I am confused about which one to use. Could anyone help me on that? Thanks Another question I have is about the relationship between solvers and the different Patch Field Types.( I am using buoyanBoussinesqSimpleFoam, and the other steady state solver dealing with heat Transfer for buoyancy driven flows...) Can I use anyone of the patch fields described in page U-133 ? or are they linked to a precise solver? Thanks Luis Blanes |
|
April 11, 2011, 16:13 |
Errors regarding Inlet and Outlet
|
#2 |
New Member
Luis Blanes
Join Date: Mar 2011
Location: Cardiff. UK.
Posts: 12
Rep Power: 15 |
Hello all
I tried to run a simulation with the following values at the U/0 directory boundaryField { warm { type fixedValue; value uniform (0 0 0); } cool { type fixedValue; value uniform (0 0 0); } defaultFaces { type fixedValue; value uniform (0 0 0); } inlet { type fixedValue; value uniform (0 0 -1); } outlet { type fixedValue; value uniform (0 0 1); And I got that error. Can somebody please help me? Thanks Can I input just two velocities in a patch just typing that in the U/0 directory?? Can the velocity vector point outside the domain?? Thanks Starting time loop Time = 0.1 DILUPBiCG: Solving for Ux, Initial residual = 1, Final residual = 0.00451649, No Iterations 1 DILUPBiCG: Solving for Uy, Initial residual = 0, Final residual = 0, No Iterations 0 DILUPBiCG: Solving for Uz, Initial residual = 1, Final residual = 8.88538e-17, No Iterations 1 #0 Foam::error:rintStack(Foam::Ostream&) in "/opt/openfoam171/lib/linuxGccDPOpt/libOpenFOAM.so" #1 Foam::sigFpe::sigFpeHandler(int) in "/opt/openfoam171/lib/linuxGccDPOpt/libOpenFOAM.so" #2 Uninterpreted: #3 Foam:ILUPreconditioner::calcReciprocalD(Foam::Fi eld<double>&, Foam::lduMatrix const&) in "/opt/openfoam171/lib/linuxGccDPOpt/libOpenFOAM.so" #4 Foam:ILUPreconditioner:ILUPreconditioner(Foam: :lduMatrix::solver const&, Foam::dictionary const&) in "/opt/openfoam171/lib/linuxGccDPOpt/libOpenFOAM.so" #5 Foam::lduMatrix:reconditioner::addasymMatrixCons tructorToTable<Foam:ILUPreconditioner>::New(Foam ::lduMatrix::solver const&, Foam::dictionary const&) in "/opt/openfoam171/lib/linuxGccDPOpt/libOpenFOAM.so" #6 Foam::lduMatrix:reconditioner::New(Foam::lduMatr ix::solver const&, Foam::dictionary const&) in "/opt/openfoam171/lib/linuxGccDPOpt/libOpenFOAM.so" #7 Foam::PBiCG::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const in "/opt/openfoam171/lib/linuxGccDPOpt/libOpenFOAM.so" #8 Foam::fvMatrix<double>::solve(Foam::dictionary const&) in "/opt/openfoam171/lib/linuxGccDPOpt/libfiniteVolume.so" #9 in "/opt/openfoam171/applications/bin/linuxGccDPOpt/buoyantBoussinesqSimpleFoam" #10 __libc_start_main in "/lib/libc.so.6" #11 in "/opt/openfoam171/applications/bin/linuxGccDPOpt/buoyantBoussinesqSimpleFoam" Floating point exception ; |
|
April 12, 2011, 06:49 |
|
#3 |
Member
Arnout
Join Date: Nov 2010
Posts: 46
Rep Power: 16 |
Try to use zeroGradient for your outflow. Is the direction of the velocity in your inlet ok?
|
|
April 12, 2011, 07:09 |
|
#4 |
New Member
Luis Blanes
Join Date: Mar 2011
Location: Cardiff. UK.
Posts: 12
Rep Power: 15 |
||
April 12, 2011, 07:51 |
Inlet velocity is ok....
|
#5 |
New Member
Luis Blanes
Join Date: Mar 2011
Location: Cardiff. UK.
Posts: 12
Rep Power: 15 |
I have checked the case again...
I use buoyantBoussinesqSimpleFoam Can anyone tell me how to input a simple Inlet and Outlet in using heatTransfer solvers? U at inlet is ok (0 0 -1) as it is pointing inside the domain (can I use negative numbers?) Thanks in advance ----------------------------------------------------- boundary file 5 ( warm { type wall; nFaces 390; startFace 90580; } cool { type wall; nFaces 390; startFace 90970; } inlet { type patch; nFaces 1; startFace 91360; } outlet { type patch; nFaces 1; startFace 91361; } defaultFaces { type wall; nFaces 5270; startFace 91362; } ---------------------------------------------------- U/0 dimensions [0 1 -1 0 0 0 0]; internalField uniform (0 0 0); boundaryField { warm { type fixedValue; value uniform (0 0 0); } cool { type fixedValue; value uniform (0 0 0); } defaultFaces { type fixedValue; value uniform (0 0 0); } inlet { type fixedValue; value uniform (0 0 -1); } outlet { type zeroGradient; { } ---------------------------------------------------- p/0 dimensions [0 2 -2 0 0 0 0]; internalField uniform 0; boundaryField { warm { type buoyantPressure; rho rhok; value uniform 0; } cool { type buoyantPressure; rho rhok; value uniform 0; } defaultFaces { type buoyantPressure; rho rhok; value uniform 0; } inlet { type buoyantPressure; rho rhok; value uniform 0; } outlet { type buoyantPressure; rho rhok; value uniform 0; } } |
|
April 13, 2011, 06:47 |
|
#6 |
New Member
Dominic
Join Date: Jan 2011
Location: Leeds, UK
Posts: 25
Rep Power: 15 |
Hi lmblanes
Just wondering a little about your pressure setup. You might try keeping the outlet/internalField at uniform 0 and setting the rest to zeroGradient. My experience is only really with simpleFoam, so I hope this helps. Also, yes you can use negative numbers for velocity as long as you're sure its in the right direction. Dom |
|
April 13, 2011, 06:57 |
|
#7 |
New Member
Luis Blanes
Join Date: Mar 2011
Location: Cardiff. UK.
Posts: 12
Rep Power: 15 |
Thanks!
I have seen lots of cases where there is an Inlet and the "Outlet" is just a free pressure boundary... What do you mean with "in the right direction"? Is there some rule? I wonder if I can do something like this ________________ I I I I Inlet(1m3/s) ---> Outlet(0.9 m3/s) ---> I I I I I Opening to atmosphere I_______________ I Thanks |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Pulsatile pressure inlet with pressure outlet | a.lynchy | FLUENT | 3 | March 23, 2012 14:45 |
total pressure boundary problem ==> flow from outlet to inlet!! | mrshb4 | OpenFOAM | 0 | November 20, 2010 13:41 |
steam flow in a pipe driven by a pressure gradient between inlet and outlet | SalvoCalvo | COMSOL | 0 | March 11, 2010 07:52 |
VOF Outlet boundary condition in cfd - ace | JM | Main CFD Forum | 0 | December 15, 2006 09:07 |
what the result is negatif pressure at inlet | chong chee nan | FLUENT | 0 | December 29, 2001 06:13 |