| pascool |
November 16, 2012 12:42 |
Cyclic boundary conditions concerning channel with constant flow rate
Hi there,
I'm trying to simulate a ribbed 2D channel in fully developed flow, by applying cyclic boundary conditions in streamwise direction and using simpleFoam. The case shall be run at a given bulk Reynolds number so that the flow rate must be specified.
My blockMeshDict file looks as follows:
Code:
boundary
(
inlet
{
type cyclic;
neighbourPatch outlet;
faces
(
(0 21 22 1)
(1 22 23 2)
(2 23 24 3)
(3 24 25 4)
);
}
outlet
{
type cyclic;
neighbourPatch inlet;
faces
(
(16 17 38 37)
(17 18 39 38)
(18 19 40 39)
(19 20 41 40)
);
}
wall1
{
type wall;
faces
(
(21 0 8 29)
);
}
wall2
{
type wall;
faces
(
(26 27 6 5)
(27 28 7 6)
(28 29 8 7)
);
}
wall3
{
type wall;
faces
(
(26 5 13 34)
);
}
wall4
{
type wall;
faces
(
(13 14 35 34)
(14 15 36 35)
(15 16 37 36)
);
}
wall5
{
type wall;
faces
(
(4 25 33 12)
(12 33 41 20)
);
}
frontAndBack
{
type empty;
faces
(
(0 1 9 8)
(1 2 10 9)
(2 3 11 10)
(3 4 12 11)
(5 6 14 13)
(6 7 15 14)
(7 8 16 15)
(8 9 17 16)
(9 10 18 17)
(10 11 19 18)
(11 12 20 19)
(21 29 30 22)
(22 30 31 23)
(23 31 32 24)
(24 32 33 25)
(26 34 35 27)
(27 35 36 28)
(28 36 37 29)
(29 37 38 30)
(30 38 39 31)
(31 39 40 32)
(32 40 41 33)
);
}
);
I don't know how to specify the initial and BC? My first attempt for p and U was:
Code:
FoamFile
{
version 2.0;
format ascii;
class volScalarField;
object p;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensions [0 2 -2 0 0 0 0];
internalField uniform 0;
boundaryField {
inlet
{
type cyclic;
}
outlet
{
type cyclic;
}
wall1
{
type zeroGradient;
}
wall2
{
type zeroGradient;
}
wall3
{
type zeroGradient;
}
wall4
{
type zeroGradient;
}
wall5
{
type zeroGradient;
}
frontAndBack
{
type empty;
}
}
Code:
FoamFile
{
version 2.0;
format ascii;
class volVectorField;
object U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensions [0 1 -1 0 0 0 0];
internalField uniform (2.98 0 0);
boundaryField
{
inlet
{
type cyclic;
}
outlet
{
type cyclic;
}
wall1
{
type fixedValue;
value uniform (0 0 0);
}
wall2
{
type fixedValue;
value uniform (0 0 0);
}
wall3
{
type fixedValue;
value uniform (0 0 0);
}
wall4
{
type fixedValue;
value uniform (0 0 0);
}
wall5
{
type fixedValue;
value uniform (0 0 0);
}
frontAndBack
{
type empty;
}
Any help apprechiated!
Best regards,
Pascal |
