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pimpleFOAM/icoFOAM,Problem of convergence while simulating oscillatory flow condition

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Old   January 29, 2018, 15:05
Default pimpleFOAM/icoFOAM,Problem of convergence while simulating oscillatory flow condition
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Hi all,

I have been trying to simulate a laminar oscillatory flow condition (eg breathing,blood pumping) using icoFOAM/pimpleFOAM.However the solution is not converging for either of the two solvers. The mesh has been used before for a similar simulation therefore the mesh does not seem to be the problem.Your valuable inputs for this problem is greatly appreciated. Given are the boundary conditions for the velocity,pressure and solution controls.
Also nNonOrthogonalCorrectors=2

Boundary Conditions for velocity

dimensions [0 1 -1 0 0 0 0];

internalField uniform (0 0 0);

type noSlip;

type uniformFixedValue;
type sine;
frequency 0.2;
amplitude .5;
scale (0 0 1);
level (0 0 0);

type zeroGradient;

Boundary Conditions for Pressure

dimensions [0 2 -2 0 0 0 0];

internalField uniform 0;

type fixedValue;
value uniform .01;

type zeroGradient;

type fixedValue;
value uniform 0;


Control Dict

application icoFoam;

startFrom latestTime;

startTime 0;

stopAt endTime;

endTime .006;

deltaT 0.0005;

writeControl timeStep;

writeInterval 20;

purgeWrite 0;

writeFormat ascii;

writePrecision 6;

writeCompression off;

timeFormat general;

timePrecision 6;

runTimeModifiable true;
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Old   January 29, 2018, 22:39
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Yuncheng Xu (Cloud)
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try zero gradient pressure on wall
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Old   July 13, 2018, 09:13
Default Convergence
Ben 017
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I would like to ask about convergence of a simulation in foam ext 4.0
Indeed, i am running a tutorial of immersed boundary(movingcylinderInchannel), using IcoDyMIbFOAM,
I would like to ask about its convergence?
You may refer to the attached picture of residuals!
Attached Images
File Type: png Uresiduals.png (41.6 KB, 10 views)
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convergence, icofoam, oscillatory flow, pimplefoam, variable bc

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