Commit 75e7defd authored by sergio's avatar sergio
Browse files
parents 21117b46 c98e404f
......@@ -29,19 +29,19 @@ Description
Basic sub-grid obstacle flame-wrinking enhancement factor model.
Details supplied by J Puttock 2/7/06.
Sub-grid flame area generation
<b> Sub-grid flame area generation <\b>
\f$ n = N - \hat{\dwea{\vec{U}}}.n_{s}.\hat{\dwea{\vec{U}}} \f$
\f$ n_{r} = \sqrt{n} \f$
where:
\f$ \hat{\dwea{\vec{U}}} = \dwea{\vec{U}} / \vert \dwea{\vec{U}}
\vert \f$
\f$ \hat{\dwea{\vec{U}}} = \dwea{\vec{U}} / \vert \dwea{\vec{U}}
\vert \f$
\f$ b = \hat{\dwea{\vec{U}}}.B.\hat{\dwea{\vec{U}}} / n_{r} \f$
\f$ b = \hat{\dwea{\vec{U}}}.B.\hat{\dwea{\vec{U}}} / n_{r} \f$
where
where:
\f$ B \f$ is the file "B".
......@@ -52,8 +52,11 @@ Description
The flame area enhancement factor \f$ \Xi_{sub} \f$ is expected to
approach:
\f[ \Xi_{{sub}_{eq}} = 1 + max(2.2 \sqrt{b}, min(0.34 \frac{\vert \dwea{\vec{U}}
\vert}{{\vec{U}}^{'}}, 1.6)) \times min(\frac{n}{4}, 1) \f]
\f[
\Xi_{{sub}_{eq}} =
1 + max(2.2 \sqrt{b}, min(0.34 \frac{\vert \dwea{\vec{U}}
\vert}{{\vec{U}}^{'}}, 1.6)) \times min(\frac{n}{4}, 1)
\f]
SourceFiles
......
......@@ -29,43 +29,48 @@ Description
Basic sub-grid obstacle drag model.
Details supplied by J Puttock 2/7/06.
Sub-grid drag term
<b> Sub-grid drag term <\b>
The resistance term (force per unit of volume) is given by:
\f[
R = -\frac{1}{2} \rho \vert \dwea{\vec{U}} \vert \dwea{\vec{U}}.D
\f[
R = -\frac{1}{2} \rho \vert \dwea{\vec{U}} \vert \dwea{\vec{U}}.D
\f]
where:
\f$ D \f$ is the tensor field "CR" in \f$ m^{-1} \f$
\f$ D \f$ is the tensor field "CR" in \f$ m^{-1} \f$
This is term is treated implicitly in UEqn.H
This is term is treated implicitly in UEqn.H
Sub-grid turbulence generation
<b> Sub-grid turbulence generation <\b>
The turbulence source term \f$ G_{R} \f$ occurring in the
\f$ \kappa-\epsilon \f$ equations for the generation of turbulence due to interaction with unresolved obstacles :
The turbulence source term \f$ G_{R} \f$ occurring in the
\f$ \kappa-\epsilon \f$ equations for the generation of turbulence due
to interaction with unresolved obstacles :
\f$ G_{R} = C_{s}\beta_{\nu} \mu_{eff} A_{w}^{2}(\dwea{\vec{U}}-\dwea{\vec{U}_{s}})^2 + \frac{1}{2}
\rho \vert \dwea{\vec{U}} \vert \dwea{\vec{U}}.T.\dwea{\vec{U}} \f$
\f$ G_{R} = C_{s}\beta_{\nu}
\mu_{eff} A_{w}^{2}(\dwea{\vec{U}}-\dwea{\vec{U}_{s}})^2 + \frac{1}{2}
\rho \vert \dwea{\vec{U}} \vert \dwea{\vec{U}}.T.\dwea{\vec{U}} \f$
where:
where:
\f$ C_{s} \f$ = 1
\f$ C_{s} \f$ = 1
\f$ \beta_{\nu} \f$ is the volume porosity (file "betav").
\f$ \beta_{\nu} \f$ is the volume porosity (file "betav").
\f$ \mu_{eff} \f$ is the effective viscosity.
\f$ \mu_{eff} \f$ is the effective viscosity.
\f$ A_{w}^{2}\f$ is the obstacle surface area per unit of volume (file "Aw").
\f$ A_{w}^{2}\f$ is the obstacle surface area per unit of volume
(file "Aw").
\f$ \dwea{\vec{U}_{s}} \f$ is the slip velocity and is considered \f$ \frac{1}{2}. \dwea{\vec{U}} \f$.
\f$ \dwea{\vec{U}_{s}} \f$ is the slip velocity and is considered
\f$ \frac{1}{2}. \dwea{\vec{U}} \f$.
\f$ T \f$ is a tensor in the file CT.
\f$ T \f$ is a tensor in the file CT.
The term \f$ G_{R} \f$ is treated explicitly in the \f$ \kappa-\epsilon \f$ Eqs in the PDRkEpsilon.C file.
The term \f$ G_{R} \f$ is treated explicitly in the \f$ \kappa-\epsilon
\f$ Eqs in the PDRkEpsilon.C file.
SourceFiles
......
......@@ -29,8 +29,9 @@ Description
Base-class for all Xi models used by the b-Xi combustion model.
See Technical Report SH/RE/01R for details on the PDR modelling.
Xi is given through an algebraic expression (algebraic.H), by solving a transport equation (transport.H) or a fixed value (fixed.H). See report
TR/HGW/10 for details on the Weller two equations model.
Xi is given through an algebraic expression (algebraic.H),
by solving a transport equation (transport.H) or a fixed value (fixed.H).
See report TR/HGW/10 for details on the Weller two equations model.
In the algebraic and transport methods \f$\Xi_{eq}\f$ is calculated in
similar way. In the algebraic approach, \f$\Xi_{eq}\f$ is the value used in
......@@ -53,7 +54,8 @@ Description
where:
\f$ G_\eta \f$ is the generation rate of wrinkling due to turbulence interaction.
\f$ G_\eta \f$ is the generation rate of wrinkling due to turbulence
interaction.
\f$ G_{in} = \kappa \rho_{u}/\rho_{b} \f$ is the generation
rate due to the flame inestability.
......@@ -68,11 +70,13 @@ Description
where:
\f$ R \f$ is the total removal.
\f$ G_\eta \f$ is a model constant.
\f$ \Xi_{\eta_{eq}} \f$ is the flame wrinkling due to turbulence.
\f$ \Xi_{{in}_{eq}} \f$ is the equilibrium level of the flame wrinkling generated by inestability. It is a constant (default 2.5).
\f$ \Xi_{{in}_{eq}} \f$ is the equilibrium level of the flame wrinkling
generated by inestability. It is a constant (default 2.5).
SourceFiles
......
......@@ -28,23 +28,31 @@ Class
Description
Laminar flame speed obtained from the SCOPE correlation.
Seven parameters are specified in terms of polynomial functions of stoichiometry. Two polynomials are fitted, covering different parts of the flammable range. If the mixture is outside the fitted range, linear interpolation is used between the extreme of the polynomio and the upper or lower flammable limit with the Markstein number constant.
Seven parameters are specified in terms of polynomial functions of
stoichiometry. Two polynomials are fitted, covering different parts of the
flammable range. If the mixture is outside the fitted range, linear
interpolation is used between the extreme of the polynomio and the upper or
lower flammable limit with the Markstein number constant.
Variations of pressure and temperature from the reference values are taken into account through \f$ pexp \f$ and \f$ texp \f$
Variations of pressure and temperature from the reference values are taken
into account through \f$ pexp \f$ and \f$ texp \f$
The laminar burning velocity fitting polynomio is:
The laminar burning velocity fitting polynomial is:
\f$ Su = a_{0}(1+a_{1}x+K+..a_{i}x^{i}..+a_{6}x^{6}) (p/p_{ref})^{pexp} (T/T_{ref})^{texp} \f$
\f$ Su = a_{0}(1+a_{1}x+K+..a_{i}x^{i}..+a_{6}x^{6}) (p/p_{ref})^{pexp}
(T/T_{ref})^{texp} \f$
where:
\f$ a_{i} \f$ are the polinomial coefficients.
\f$ a_{i} \f$ are the polinomial coefficients.
\f$ pexp \f$ and \f$ texp \f$ are the pressure and temperature factors respectively.
\f$ pexp \f$ and \f$ texp \f$ are the pressure and temperature factors
respectively.
\f$ x \f$ is the equivalence ratio.
\f$ x \f$ is the equivalence ratio.
\f$ T_{ref} \f$ and \f$ p_{ref} \f$ are the temperature and pressure references for the laminar burning velocity.
\f$ T_{ref} \f$ and \f$ p_{ref} \f$ are the temperature and pressure
references for the laminar burning velocity.
SourceFiles
......
......@@ -187,7 +187,7 @@ case MPICH-GM:
setenv FOAM_MPI_LIBBIN $FOAM_LIBBIN/mpich-gm
breaksw
case MPICH-GM:
case HPMPI:
setenv MPI_HOME /opt/hpmpi
setenv MPI_ARCH_PATH $MPI_HOME
setenv MPICH_ROOT=$MPI_ARCH_PATH
......
......@@ -49,7 +49,7 @@ Foam::laplaceFilter::laplaceFilter(const fvMesh& mesh, scalar widthCoeff)
(
IOobject
(
"anisotropicFilterCoeff",
"laplaceFilterCoeff",
mesh.time().timeName(),
mesh
),
......@@ -70,7 +70,7 @@ Foam::laplaceFilter::laplaceFilter(const fvMesh& mesh, const dictionary& bd)
(
IOobject
(
"anisotropicFilterCoeff",
"laplaceFilterCoeff",
mesh.time().timeName(),
mesh
),
......
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