| zqlhzx |
January 16, 2014 13:06 |
how to use directed-mapped boundry condition
2 Attachment(s)
Hi foamers,
I want to simulated a regular pipe with a interface in the middle of the geometry.The length(X-direction) is 200mm,heigh(Y-direction) is 50mm and wide(Z-direction) is 50mm.The interface is at the location of the length is 100mm.Both domains are fluid and one is named fluid1 and another is named fluid2.The number is (50 25 25 ).So the interface is named fluid1_to_fluid2 and fluid2_to_fluid1.
This is my geometry.
Attachment 28025
The solve I used is modified from chtmulRegionFoam with solid(OF2.0.1)!
The case can be run ,but the result is strange for me ,and it is wrong.
Attachment 28026
The vilocity is clearly wrong at the middle cell(near the interface).I think I define the wrong U boundry of the interface.
Please see my blockMeshDict,U boundry of fluid1 and fluid2.
blockMeshDict:
Code:
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object blockMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
convertToMeters 1;
vertices
(
(-0.1 -0.05 -0.05)
( 0.1 -0.05 -0.05)
( 0.1 0.05 -0.05)
(-0.1 0.05 -0.05)
(-0.1 -0.05 0.05)
( 0.1 -0.05 0.05)
( 0.1 0.05 0.05)
(-0.1 0.05 0.05)
);
blocks
(
hex (0 1 2 3 4 5 6 7) (50 25 25) simpleGrading (1 1 1)
);
edges
(
);
boundary
(
topwall
{
type wall;
faces
(
(3 7 6 2)
);
}
inlet
{
type patch;
faces
(
(0 4 7 3)
);
}
outlet
{
type patch;
faces
(
(2 6 5 1)
);
}
bottomwall
{
type wall;
faces
(
(1 5 4 0)
);
}
minZ
{
type wall;
faces
(
(0 3 2 1)
);
}
maxZ
{
type wall;
faces
(
(4 5 6 7)
);
}
);
mergePatchPairs
(
);
boundry of fluid1(domain 1)
Code:
6
(
topwall
{
type wall;
nFaces 625;
startFace 45000;
}
inlet
{
type patch;
nFaces 625;
startFace 45625;
}
bottomwall
{
type wall;
nFaces 625;
startFace 46250;
}
minZ
{
type wall;
nFaces 625;
startFace 46875;
}
maxZ
{
type wall;
nFaces 625;
startFace 47500;
}
fluid1_to_fluid2
{
type directMappedWall;
nFaces 625;
startFace 48125;
sampleMode nearestPatchFace;
sampleRegion fluid2;
samplePatch fluid2_to_fluid1;
offsetMode uniform;
offset (0.002 0 0);
}
)
boundry of fluid2(domain 2)
Code:
6
(
topwall
{
type wall;
nFaces 625;
startFace 45000;
}
outlet
{
type patch;
nFaces 625;
startFace 45625;
}
bottomwall
{
type wall;
nFaces 625;
startFace 46250;
}
minZ
{
type wall;
nFaces 625;
startFace 46875;
}
maxZ
{
type wall;
nFaces 625;
startFace 47500;
}
fluid2_to_fluid1
{
type directMappedWall;
nFaces 625;
startFace 48125;
sampleMode nearestPatchFace;
sampleRegion fluid1;
samplePatch fluid1_to_fluid2;
offsetMode uniform;
offset (-0.002 0 0);
}
)
U boundry for fluid1
Code:
FoamFile
{
version 2.0;
format ascii;
class volVectorField;
object U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensions [0 1 -1 0 0 0 0];
internalField uniform (0 0 0);
boundaryField
{
inlet
{
type turbulentInlet;
referenceField uniform (10 0 0);
fluctuationScale (0.2 0.1 0.1);
value uniform (10 0 0);
}
fluid1_to_fluid2
{
type zeroGradient;
}
topwall
{
type fixedValue;
value uniform (0 0 0);
}
bottomwall
{
type fixedValue;
value uniform (0 0 0);
}
minZ
{
type fixedValue;
value uniform (0 0 0);
}
maxZ
{
type fixedValue;
value uniform (0 0 0);
}
}
U boundry for fluid2
Code:
dimensions [0 1 -1 0 0 0 0];
internalField uniform (0 0 0);
boundaryField
{
outlet
{
type inletOutlet;
inletValue uniform (0 0 0);
value uniform (0 0 0);
}
fluid2_to_fluid1
{
type directMapped;
value uniform (0 0 0);
setAverage true;
average (10 0 0);
}
topwall
{
type fixedValue;
value uniform (0 0 0);
}
bottomwall
{
type fixedValue;
value uniform (0 0 0);
}
minZ
{
type fixedValue;
value uniform (0 0 0);
}
maxZ
{
type fixedValue;
value uniform (0 0 0);
}
}
Did I set the right boundry for interface?How can I solve my problem?Please onesome can give me some advices!After running th case successly,I will solve turbulent flow in the fluid1 and solve combustion in the fluid1.Now it is my first step! |
