| saidc. |
March 29, 2020 14:27 |
icoUncoupledKinematicParcelFoam - simpleFoam pisoFoam
Hi everyone,
I have problem which I can't solve. I've 2 different case with same geometry. One of them is simpleFoam (RAS) case and other pisoFoam (LES) case. I ran the simulations 15 seconds with their own solvers and the results looks good so there isn't any problem. But when I try particle-tracking with icoUncoupledKinematicParcelFoam some things are not going well.
Both case, my Reynolds number is 5e4 but if i change to this number in icoUncoupledKinematicParcelFoam the case run just a few step and stop. In any case, when I didn't change kinematic viscosity the loop didn't complete. I give 3 second but it run like 1.9 second.
pisoFoam is worse than simpleFoam. I mean, simpleFoam ran about 1.9 second at least. pisoFoam ran like 0.3 second and stop suddenly. Also there is no error.
Can someone who knows these situations give an idea? I am open to any advice.
This is gif of simpleFoam particle-tracking:
https://gfycat.com/energeticdecisivecurlew
simpleFoam
controlDict
Code:
application icoUncoupledKinematicParcelFoam;
startFrom latestTime;
startTime 0;
stopAt endTime;
endTime 3;
deltaT 0.005;
writeControl adjustableRunTime;
writeInterval 0.01;
purgeWrite 0;
writeFormat ascii;
writePrecision 6;
writeCompression off;
timeFormat general;
timePrecision 6;
runTimeModifiable yes;
kinematicCloudProperties
Code:
solution
{
active true;
coupled false;
transient yes;
cellValueSourceCorrection off;
maxCo 0.3;
interpolationSchemes
{
rho cell;
U cellPoint;
mu cell;
}
integrationSchemes
{
U Euler;
}
}
constantProperties
{
rho0 1.2;
youngsModulus 6e8;
poissonsRatio 0.35;
}
subModels
{
particleForces
{
sphereDrag;
gravity;
}
injectionModels
{
model1
{
type patchInjection;
parcelBasisType fixed;
patchName inlet;
nParticle 1;
SOI 0;
U0 (10 0 0);
parcelsPerSecond 1000;
sizeDistribution
{
type normal;
normalDistribution
{
expectation 650e-6;
variance 25e-6;
minValue 500e-6;
maxValue 800e-6;
}
}
flowRateProfile constant 1;
massTotal 0;
duration 100;
}
}
dispersionModel none;
patchInteractionModel none;
surfaceFilmModel none;
stochasticCollisionModel none;
collisionModel none;
pairCollisionCoeffs
{
maxInteractionDistance 0.0001;
writeReferredParticleCloud no;
pairModel pairSpringSliderDashpot;
pairSpringSliderDashpotCoeffs
{
useEquivalentSize no;
alpha 0.12;
b 1.5;
mu 0.52;
cohesionEnergyDensity 0;
collisionResolutionSteps 12;
};
wallModel wallLocalSpringSliderDashpot;
wallLocalSpringSliderDashpotCoeffs
{
useEquivalentSize no;
collisionResolutionSteps 12;
upperWall
{
youngsModulus 1e10;
poissonsRatio 0.23;
alpha 0.12;
b 1.5;
mu 0.43;
cohesionEnergyDensity 0;
}
lowerWall
{
youngsModulus 1e10;
poissonsRatio 0.23;
alpha 0.12;
b 1.5;
mu 0.43;
cohesionEnergyDensity 0;
}
frontAndBack
{
youngsModulus 1e10;
poissonsRatio 0.23;
alpha 0.12;
b 1.5;
mu 0.1;
cohesionEnergyDensity 0;
}
};
}
}
cloudFunctions
{}
pisoFoam
controlDict
Code:
application icoUncoupledKinematicParcelFoam;
startFrom startTime;
startTime 0;
stopAt endTime;
endTime 1;
deltaT 0.005;
writeControl adjustableRunTime;
writeInterval 0.01;
purgeWrite 0;
writeFormat ascii;
writePrecision 6;
writeCompression off;
timeFormat general;
timePrecision 6;
runTimeModifiable yes;
kinematicCloudProperties
Code:
solution
{
active true;
coupled false;
transient yes;
cellValueSourceCorrection off;
maxCo 0.5;
interpolationSchemes
{
rho cell;
U cellPoint;
mu cell;
}
integrationSchemes
{
U Euler;
}
}
constantProperties
{
rho0 1.2;
youngsModulus 6e8;
poissonsRatio 0.35;
}
subModels
{
particleForces
{
sphereDrag;
gravity;
}
injectionModels
{
model1
{
type patchInjection;
parcelBasisType fixed;
patchName inlet;
nParticle 1;
SOI 0;
U0 (10 0 0);
parcelsPerSecond 1000;
sizeDistribution
{
type normal;
normalDistribution
{
expectation 650e-6;
variance 25e-6;
minValue 500e-6;
maxValue 800e-6;
}
}
flowRateProfile constant 1;
massTotal 0;
duration 1;
}
}
dispersionModel none;
patchInteractionModel none;
surfaceFilmModel none;
stochasticCollisionModel none;
collisionModel none;
pairCollisionCoeffs
{
maxInteractionDistance 0.0001;
writeReferredParticleCloud no;
pairModel pairSpringSliderDashpot;
pairSpringSliderDashpotCoeffs
{
useEquivalentSize no;
alpha 0.12;
b 1.5;
mu 0.52;
cohesionEnergyDensity 0;
collisionResolutionSteps 12;
};
wallModel wallLocalSpringSliderDashpot;
wallLocalSpringSliderDashpotCoeffs
{
useEquivalentSize no;
collisionResolutionSteps 12;
upperWall
{
youngsModulus 1e10;
poissonsRatio 0.23;
alpha 0.12;
b 1.5;
mu 0.43;
cohesionEnergyDensity 0;
}
lowerWall
{
youngsModulus 1e10;
poissonsRatio 0.23;
alpha 0.12;
b 1.5;
mu 0.43;
cohesionEnergyDensity 0;
}
frontAndBack
{
youngsModulus 1e10;
poissonsRatio 0.23;
alpha 0.12;
b 1.5;
mu 0.1;
cohesionEnergyDensity 0;
}
};
}
}
cloudFunctions
{}
Stops like this
Code:
Time = 0.291
Evolving kinematicCloud
Solving 3-D cloud kinematicCloud
Cloud: kinematicCloud injector: model1
Added 5 new parcels
Cloud: kinematicCloud
Current number of parcels = 1455
Current mass in system = 2.50729e-07
Linear momentum = (1.9443e-07 4.27472e-08 1.03438e-12)
|Linear momentum| = 1.99073e-07
Linear kinetic energy = 1.09353e-07
model1:
number of parcels added = 1455
mass introduced = 2.50729e-07
Rotational kinetic energy = 0
ExecutionTime = 260.49 s ClockTime = 262 s
Time = 0.292
Evolving kinematicCloud
Solving 3-D cloud kinematicCloud
Cloud: kinematicCloud injector: model1
Added 5 new parcels
Best regards,
Said. |
