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andy
2012-07-12 17:08:00 +01:00
parent b19eedd095
commit 3eddf5d904
2 changed files with 90 additions and 59 deletions
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73
src/turbulenceModels/incompressible/RAS/derivedFvPatchFields/atmBoundaryLayerInletEpsilon/atmBoundaryLayerInletEpsilonFvPatchScalarField.H
View File

@ -8,10 +8,10 @@
License
This file is part of OpenFOAM.
OpenFOAM is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
OpenFOAM is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
@ -19,11 +19,12 @@ License
for more details.
You should have received a copy of the GNU General Public License
along with OpenFOAM; if not, write to the Free Software Foundation,
Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
Class
atmBoundaryLayerInletEpsilonFvPatchScalarField
Foam::incompressible::atmBoundaryLayerInletEpsilonFvPatchScalarField
\ingroup grpIcoRASBoundaryConditions grpInletBoundaryConditions
Description
This boundary condition specifies an inlet value for the turbulence
@ -32,40 +33,54 @@ Description
velocity boundary condition.
\f[
epsilon = Ustar^3 / (K(z - zGround + z0))
epsilon = (U^*)^3 / (K(z - z_g + z_0))
\f]
where:
\var Ustar = frictional velocity
\var K = Karman's constant
\var z = vertical co-ordinate [m]
\var z0 = surface roughness length [m]
\var zGround = minimum vlaue in z direction [m]
where
/vartable
U^* | frictional velocity
K | Karman's constant
z | vertical co-ordinate [m]
z_0 | surface roughness length [m]
z_g | minimum vlaue in z direction [m]
/endvartable
and:
\f[
Ustar = K Uref/ln((Zref + z0)/z0)
U^* = K \frac{U_{ref}}{ln(\frac{Z_{ref} + z_0}{z_0}}
\f]
where:
/vartable
U_{ref} | reference velocity at \f$Z_{ref}\f$ [m/s]
Z_{ref} | reference height [m]
/endvartable
\var Uref = reference velocity at Zref [m/s]
\var Zref = reference height [m]
/heading Patch usage
/table
Property | Description | Required | Default value
z | vertical co-ordinate [m] | yes |
kappa | Karman's constanat | no | 0.41
Uref | reference velocity [m/s] | yes |
Href | reference height [m] | yes |
z0 | surface roughness length [m] | yes |
zGround | minimum z co-ordinate [m] | yes |
/endtable
Example of the boundary condition specification:
\verbatim
myPatch
{
type atmBoundaryLayerInletEpsilon;
z 1.0; // vertical co-ordinate [m]
kappa 0.41; // kappa coefficient (default = 0.41)
Uref 1.0; // reference velocity [m/s]
Href 0.0; // reference height [m]
z0 uniform 0.0; // surface roughness length [m]
zGround uniform 0.0; // minimum z co-ordinate [m]
}
myPatch
{
type atmBoundaryLayerInletVelocity;
z 1.0;
kappa 0.41;
Uref 1.0;
Href 0.0;
z0 uniform 0.0;
zGround uniform 0.0;
}
\endverbatim
Reference:

76
src/turbulenceModels/incompressible/RAS/derivedFvPatchFields/atmBoundaryLayerInletVelocity/atmBoundaryLayerInletVelocityFvPatchVectorField.H
View File

@ -8,10 +8,10 @@
License
This file is part of OpenFOAM.
OpenFOAM is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
OpenFOAM is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
@ -19,11 +19,12 @@ License
for more details.
You should have received a copy of the GNU General Public License
along with OpenFOAM; if not, write to the Free Software Foundation,
Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
Class
atmBoundaryLayerInletVelocityFvPatchVectorField
Foam::incompressible::atmBoundaryLayerInletVelocityFvPatchVectorField
\ingroup grpIcoRASBoundaryConditions grpInletBoundaryConditions
Description
This boundary condition specifies a velocity inlet profile appropriate
@ -32,27 +33,29 @@ Description
co-ordinate \c z.
\f[
U = (Ustar/K) ln((z - zGround + z0)/z0)
U = \frac{U^*}{K} ln(\frac{z - z_g + z_0}{z_0})
\f]
where:
\var Ustar = frictional velocity
\var K = Karman's constant
\var z = vertical co-ordinate [m]
\var z0 = surface roughness length [m]
\var zGround = minimum vlaue in z direction [m]
where
/vartable
U^* | frictional velocity
K | Karman's constant
z | vertical co-ordinate [m]
z_0 | surface roughness length [m]
z_g | minimum vlaue in z direction [m]
/endvartable
and:
\f[
Ustar = K Uref/ln((Zref + z0)/z0)
U^* = K \frac{U_{ref}}{ln(\frac{Z_{ref} + z_0}{z_0})}
\f]
where:
\var Uref = reference velocity at Zref [m/s]
\var Zref = reference height [m]
/vartable
U_{ref} | reference velocity at \f$Z_{ref}\f$ [m/s]
Z_{ref} | reference height [m]
/endvartable
Reference:
D.M. Hargreaves and N.G. Wright, "On the use of the k-epsilon model
@ -66,19 +69,32 @@ Description
The roughness height (Er) is given by Er = 20 z0 following the same
reference.
/heading Patch usage
/table
Property | Description | Required | Default value
n | flow direction | yes |
z | vertical co-ordinate [m] | yes |
kappa | Karman's constanat | no | 0.41
Uref | reference velocity [m/s] | yes |
Href | reference height [m] | yes |
z0 | surface roughness length [m] | yes |
zGround | minimum z co-ordinate [m] | yes |
/endtable
Example of the boundary condition specification:
\verbatim
myPatch
{
type atmBoundaryLayerInletVelocity;
n (0 1 0); // flow direction
z 1.0; // vertical co-ordinate [m]
kappa 0.41; // kappa coefficient (default = 0.41)
Uref 1.0; // reference velocity [m/s]
Href 0.0; // reference height [m]
z0 uniform 0.0; // surface roughness length [m]
zGround uniform 0.0; // minimum z co-ordinate [m]
}
myPatch
{
type atmBoundaryLayerInletVelocity;
n (0 1 0);
z 1.0;
kappa 0.41;
Uref 1.0;
Href 0.0;
z0 uniform 0.0;
zGround uniform 0.0;
}
\endverbatim
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