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Flow Over a cylinder: Properties not conserved

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Old   July 23, 2010, 10:44
Default Flow Over a cylinder: Properties not conserved
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jeff osborne
Join Date: Mar 2010
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Hello all,

I am trying to simulate flow over a cylinder for a validation as I am new to CFD. I am simulating at a Reynolds number of 150. Essentially what happens is everything is going fine, and then after a certain amount of time, all the flow properties (U and p in this case) skyrocket and the simulation crashes. I have attached a few pictures of the simulation that may help explain what is happening. Below is also a printout of my U and p files respectively:

Velocity File:

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

internalField uniform (11.76e-4 0 0); //Re=150 for Air

boundaryField
{
inlet
{
type fixedValue;
value uniform (11.76e-4 0 0);
}
backOutlet
{
type zeroGradient;
}
cylinder
{
type fixedValue;
value uniform (0 0 0);
}
frontAndBack
{
type empty;
}
topOutlet
{
type fixedValue;
value uniform (11.76e-4 0 0);
}
bottomOutlet
{
type fixedValue;
value uniform (11.76e-4 0 0);
}

Pressure File:

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

internalField uniform 0;

boundaryField
{

inlet
{
type fixedValue;
value uniform 0;
}
backOutlet
{
type zeroGradient;
}
cylinder
{
type zeroGradient;
}

frontAndBack
{
type empty;
}
topOutlet
{
type fixedValue;
value uniform 0;
}
bottomOutlet
{
type fixedValue;
value uniform 0;
}
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