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-   -   problem of icoDyMfoam (http://www.cfd-online.com/Forums/openfoam/71782-problem-icodymfoam.html)

ranas January 14, 2010 12:01

problem of icoDyMfoam
 
hi, all
I use icoDyMfoam to calculate a ellipse (a/b=100) oscillating in an fluid. It works well when the non-dimensional time is less than 15. When the non-dimensional time is large than 15, the coefficiency of lift and drag become irregular, and the pressure in the flow field seems irrational. How to improve it? icoDyMfoam is compiled in double precision. best regards!!!

ranas January 16, 2010 04:43

the boundary condition
 
pressure:

plate
{
type zeroGradient;
}
up
{
type zeroGradient;
}
outlet
{
type fixedValue;
value uniform 0;
}
down
{
type zeroGradient;
}
inlet
{
type zeroGradient;
}
frontAndBackPlanes
{
type empty;
}


velocity:

plate
{
type movingWallVelocity;
value uniform (0 0 0);
}
up
{
type fixedValue;
value uniform (1 0 0);
}
outlet
{
type zeroGradient;
}
down
{
type fixedValue;
value uniform (1 0 0);
}
inlet
{
type fixedValue;
value uniform (1 0 0);
}
frontAndBackPlanes
{
type empty;
}


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