[spalartallmaras]

Hello everyone,


I have a problem during calculation with simpleFoam cuz there is huge No Iterations in pressure... did anybody have same experience?
I guess mesh is not so bad...

Time = 1

smoothSolver:  Solving for Ux, Initial residual = 1, Final residual = 6.09712593e-11, No Iterations 12
smoothSolver:  Solving for Uy, Initial residual = 1, Final residual = 5.77330639e-11, No Iterations 21
smoothSolver:  Solving for Uz, Initial residual = 1, Final residual = 8.21036826e-11, No Iterations 21
DICPCG:  Solving for p, Initial residual = 1, Final residual = 76696.7149, No Iterations 1000
DICPCG:  Solving for p, Initial residual = 0.990931782, Final residual = 0.0489787022, No Iterations 383
DICPCG:  Solving for p, Initial residual = 0.987785896, Final residual = 0.049046402, No Iterations 228
DICPCG:  Solving for p, Initial residual = 0.969196613, Final residual = 0.0484079088, No Iterations 296
DICPCG:  Solving for p, Initial residual = 0.891878429, Final residual = 100.036019, No Iterations 1000

checkMesh

Checking geometry...
    Overall domain bounding box (-1.10000002 -0.133906668 -2.2000002) (2.20000005 -0.00690633002 2.2000002)
    Mesh has 3 geometric (non-empty/wedge) directions (1 1 1)
    Mesh has 3 solution (non-empty) directions (1 1 1)
    Boundary openness (-8.20650715e-17 -1.58993606e-14 -3.91033682e-17) OK.
    Max cell openness = 6.75100988e-16 OK.
    Max aspect ratio = 52.6435524 OK.
    Minimum face area = 5.2685451e-14. Maximum face area = 0.000135862195.  Face area magnitudes OK.
    Min volume = 6.22058526e-17. Max volume = 1.34261302e-06.  Total volume = 1.8439643.  Cell volumes OK.
    Mesh non-orthogonality Max: 86.6469526 average: 4.25564992
   *Number of severely non-orthogonal (> 70 degrees) faces: 64.
    Non-orthogonality check OK.
  <<Writing 64 non-orthogonal faces to set nonOrthoFaces
    Face pyramids OK.
    Max skewness = 3.07178227 OK.
    Coupled point location match (average 0) OK.

[petros]

Hi,

It is nearly impossible to find help without providing enough details of your simulation.
Please refer to Guide: How to ask a question on the forums.

[HPE]

Hi,

- Could you please elaborate on the boundary conditions or settings you use?
- The problem can be anything based on your problem definition.

Thanks.

[spalartallmaras]

@petros HPE

thank you for your answers and I will write my question more specific in future.

I answered late because I wanted to try with another mesh with snappyHexMesh.

Now my simulations works well with mesh which I generated with snappyHexMesh.

Hymm, but I think it is interessting because the old mesh shows through checkMesh not bad mesh quality...

Time = 1

DILUPBiCG:  Solving for Ux, Initial residual = 1, Final residual = 0.0552703277, No Iterations 1
DILUPBiCG:  Solving for Uy, Initial residual = 1, Final residual = 0.0187385099, No Iterations 7
DILUPBiCG:  Solving for Uz, Initial residual = 1, Final residual = 0.0655418096, No Iterations 3
GAMG:  Solving for p, Initial residual = 1, Final residual = 0.0334799279, No Iterations 2
GAMG:  Solving for p, Initial residual = 0.00980025844, Final residual = 0.000371623072, No Iterations 5
GAMG:  Solving for p, Initial residual = 0.0011802513, Final residual = 5.49878949e-05, No Iterations 4
GAMG:  Solving for p, Initial residual = 0.000141124877, Final residual = 6.79051123e-06, No Iterations 5
time step continuity errors : sum local = 0.0003201956, global = 8.17044962e-05, cumulative = 8.17044962e-05
DILUPBiCG:  Solving for nuTilda, Initial residual = 0.999999998, Final residual = 0.0295856843, No Iterations 1
ExecutionTime = 166.79 s  ClockTime = 167 s

--> FOAM Warning : 
    From function Foam::tmp<Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> > Foam::RASModels::SpalartAllmaras<BasicTurbulenceModel>::k() const [with BasicTurbulenceModel = Foam::IncompressibleTurbulenceModel<Foam::transportModel>]
    in file ../turbulenceModels/lnInclude/SpalartAllmaras.C at line 306
    Turbulence kinetic energy not defined for Spalart-Allmaras model. Returning zero field
--> FOAM Warning : 
    From function Foam::tmp<Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> > Foam::RASModels::SpalartAllmaras<BasicTurbulenceModel>::k() const [with BasicTurbulenceModel = Foam::IncompressibleTurbulenceModel<Foam::transportModel>]
    in file ../turbulenceModels/lnInclude/SpalartAllmaras.C at line 306
    Turbulence kinetic energy not defined for Spalart-Allmaras model. Returning zero field
--> FOAM Warning : 
    From function Foam::tmp<Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> > Foam::RASModels::SpalartAllmaras<BasicTurbulenceModel>::epsilon() const [with BasicTurbulenceModel = Foam::IncompressibleTurbulenceModel<Foam::transportModel>]
    in file ../turbulenceModels/lnInclude/SpalartAllmaras.C at line 329
    Turbulence kinetic energy dissipation rate not defined for Spalart-Allmaras model. Returning zero field
Time = 2

DILUPBiCG:  Solving for Ux, Initial residual = 0.138652779, Final residual = 0.00795621515, No Iterations 1
DILUPBiCG:  Solving for Uy, Initial residual = 0.572480797, Final residual = 0.0307366569, No Iterations 7
DILUPBiCG:  Solving for Uz, Initial residual = 0.0151063027, Final residual = 0.00149256762, No Iterations 4
GAMG:  Solving for p, Initial residual = 0.0451004771, Final residual = 0.00194888193, No Iterations 3
GAMG:  Solving for p, Initial residual = 0.00382879327, Final residual = 0.000112451478, No Iterations 5
GAMG:  Solving for p, Initial residual = 0.000406659626, Final residual = 1.42711715e-05, No Iterations 5
GAMG:  Solving for p, Initial residual = 5.26525711e-05, Final residual = 1.28786196e-06, No Iterations 7
time step continuity errors : sum local = 7.10261753e-05, global = -1.2129692e-05, cumulative = 6.95748042e-05
DILUPBiCG:  Solving for nuTilda, Initial residual = 0.202660738, Final residual = 0.00708750641, No Iterations 1
ExecutionTime = 330.6 s  ClockTime = 332 s

--> FOAM Warning : 
    From function Foam::tmp<Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> > Foam::RASModels::SpalartAllmaras<BasicTurbulenceModel>::k() const [with BasicTurbulenceModel = Foam::IncompressibleTurbulenceModel<Foam::transportModel>]
    in file ../turbulenceModels/lnInclude/SpalartAllmaras.C at line 306
    Turbulence kinetic energy not defined for Spalart-Allmaras model. Returning zero field
--> FOAM Warning : 
    From function Foam::tmp<Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> > Foam::RASModels::SpalartAllmaras<BasicTurbulenceModel>::k() const [with BasicTurbulenceModel = Foam::IncompressibleTurbulenceModel<Foam::transportModel>]
    in file ../turbulenceModels/lnInclude/SpalartAllmaras.C at line 306
    Turbulence kinetic energy not defined for Spalart-Allmaras model. Returning zero field
--> FOAM Warning : 
    From function Foam::tmp<Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> > Foam::RASModels::SpalartAllmaras<BasicTurbulenceModel>::epsilon() const [with BasicTurbulenceModel = Foam::IncompressibleTurbulenceModel<Foam::transportModel>]
    in file ../turbulenceModels/lnInclude/SpalartAllmaras.C at line 329
    Turbulence kinetic energy dissipation rate not defined for Spalart-Allmaras model. Returning zero field
Time = 3

DILUPBiCG:  Solving for Ux, Initial residual = 0.0501572543, Final residual = 0.00457682406, No Iterations 2
DILUPBiCG:  Solving for Uy, Initial residual = 0.562996963, Final residual = 0.042798906, No Iterations 5
DILUPBiCG:  Solving for Uz, Initial residual = 0.00763483478, Final residual = 0.000711415412, No Iterations 7
GAMG:  Solving for p, Initial residual = 0.0294920734, Final residual = 0.00103748156, No Iterations 3
GAMG:  Solving for p, Initial residual = 0.00222063333, Final residual = 9.36741936e-05, No Iterations 7
GAMG:  Solving for p, Initial residual = 0.000224596243, Final residual = 1.0530106e-05, No Iterations 6
GAMG:  Solving for p, Initial residual = 3.08659413e-05, Final residual = 1.21240484e-06, No Iterations 8
time step continuity errors : sum local = 4.30095931e-05, global = -9.79780675e-06, cumulative = 5.97769974e-05
DILUPBiCG:  Solving for nuTilda, Initial residual = 0.207452704, Final residual = 0.00947054062, No Iterations 1
ExecutionTime = 515.42 s  ClockTime = 517 s

and so on...