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Openfoam - Run Wind Simulations in Different Direction

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Old   May 9, 2016, 05:30
Default Openfoam - Run Wind Simulations in Different Direction
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KYA123
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Hi,

Recently, I have tried running the simulation in North direction and it succeeds. But when I tried to run the same simulation in S, NE and SE direction. But the error message keeps popping out as listed below:

Create time

Create mesh for time = 0

Reading field p

Reading field U

Reading/calculating face flux field phi

Selecting incompressible transport model Newtonian
Selecting RAS turbulence model realizableKE
realizableKECoeffs
{
Cmu 0.09;
A0 4;
C2 1.9;
sigmak 1;
sigmaEps 1.2;
}

No finite volume options present


SIMPLE: convergence criteria
field p tolerance 1e-005
field U tolerance 1e-005
field k tolerance 1e-005
field epsilon tolerance 1e-005


Starting time loop

Time = 1

DILUPBiCG: Solving for Ux, Initial residual = nan, Final residual = nan, No Iterations 1001
DILUPBiCG: Solving for Uy, Initial residual = nan, Final residual = nan, No Iterations 1001
DILUPBiCG: Solving for Uz, Initial residual = nan, Final residual = nan, No Iterations 1001
DICPCG: Solving for p, Initial residual = nan, Final residual = nan, No Iterations 1001
time step continuity errors : sum local = nan, global = nan, cumulative = nan
DILUPBiCG: Solving for epsilon, Initial residual = nan, Final residual = nan, No Iterations 1001
DILUPBiCG: Solving for k, Initial residual = nan, Final residual = nan, No Iterations 1001
ExecutionTime = 240.417 s ClockTime = 240 s



--> FOAM FATAL IO ERROR:
wrong token type - expected Scalar, found on line 0 the word 'nan'

file: D:/CFD-Project/Test/Trial_S/OpenFOAM/system/data.solverPerformance.U at line 0.

From function operator>>(Istream&, Scalar&)
in file lnInclude/../primitives/Scalar/Scalar.T.C at line 93.

FOAM exiting

Kindly advise on how to solve the problem.

Thanks
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Old   May 9, 2016, 06:33
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Quote:
Originally Posted by YK123 View Post
Hi,

Recently, I have tried running the simulation in North direction and it succeeds. But when I tried to run the same simulation in S, NE and SE direction. But the error message keeps popping out as listed below:

Create time

Create mesh for time = 0

Reading field p

Reading field U

Reading/calculating face flux field phi

Selecting incompressible transport model Newtonian
Selecting RAS turbulence model realizableKE
realizableKECoeffs
{
Cmu 0.09;
A0 4;
C2 1.9;
sigmak 1;
sigmaEps 1.2;
}

No finite volume options present


SIMPLE: convergence criteria
field p tolerance 1e-005
field U tolerance 1e-005
field k tolerance 1e-005
field epsilon tolerance 1e-005


Starting time loop

Time = 1

DILUPBiCG: Solving for Ux, Initial residual = nan, Final residual = nan, No Iterations 1001
DILUPBiCG: Solving for Uy, Initial residual = nan, Final residual = nan, No Iterations 1001
DILUPBiCG: Solving for Uz, Initial residual = nan, Final residual = nan, No Iterations 1001
DICPCG: Solving for p, Initial residual = nan, Final residual = nan, No Iterations 1001
time step continuity errors : sum local = nan, global = nan, cumulative = nan
DILUPBiCG: Solving for epsilon, Initial residual = nan, Final residual = nan, No Iterations 1001
DILUPBiCG: Solving for k, Initial residual = nan, Final residual = nan, No Iterations 1001
ExecutionTime = 240.417 s ClockTime = 240 s



--> FOAM FATAL IO ERROR:
wrong token type - expected Scalar, found on line 0 the word 'nan'

file: D:/CFD-Project/Test/Trial_S/OpenFOAM/system/data.solverPerformance.U at line 0.

From function operator>>(Istream&, Scalar&)
in file lnInclude/../primitives/Scalar/Scalar.T.C at line 93.

FOAM exiting

Kindly advise on how to solve the problem.

Thanks
Hello,
can you post your BC? From the error seems it wants a scalar value but it finds a nan
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Old   May 10, 2016, 02:42
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KYA123
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Hi,

Below is my boundary condition:

1) For Wall on all building geometries,
P = zero gradient,
U = fixedValue with (x y z) = uniform 0,
Epsilon = epsilonWallFunction, uniform 0.1
K = kqRWallFunction, uniform 0.1
Nut = nutkWallFunction, Value 0

2) For Wall on blockmesh bottom,
P = zero gradient,
U = fixedValue with (x y z) = uniform 0,
Epsilon = epsilonWallFunction, uniform 0.1
K = kqRWallFunction, uniform 0.1
Nut = nutkWallFunction, Value 0

3) For Inlet on blockmesh front,
P = zero gradient,
U = atmBoundaryLayerInlet (0m/s)
Epsilon = MixingLengthFrequency 1m
K = turbulentintensityKineticenergyInlet 5%
Nut = Calculated Value 0

4) For Outlet on blockmesh back,
P = fixedValue, uniform 0
U = zeroGradient
Epsilon = zeroGradient
K = zeroGradient
Nut = Calculated Value 0
5) For Slip on blockmesh top
All P, U, Epsilon, K and Nut = zeroGradient


Thanks and Best Regards
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Old   May 16, 2016, 07:38
Default Openfoam - Run Wind Simulations in Different Direction
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KYA123
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http://www.cfd-online.com/Forums/ope...direction.html

Kindly advise on how to solve the problems urgently.
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