freeflow/rans/twoeq/kepsilon/model.hh File Reference

A single-phase, isothermal k-epsilon model. More...

#include <dumux/common/properties.hh>
#include <dumux/freeflow/properties.hh>
#include <dumux/freeflow/rans/model.hh>
#include <dumux/freeflow/rans/twoeq/indices.hh>
#include <dumux/freeflow/turbulencemodel.hh>
#include "problem.hh"
#include "fluxvariables.hh"
#include "localresidual.hh"
#include "volumevariables.hh"
#include "iofields.hh"

Go to the source code of this file.

Description

A single-phase, isothermal k-epsilon model.

Single-phase Reynolds-Averaged Navier-Stokes flow For a detailed model decription see freeflow/rans/model.hh.

The k-epsilon models calculate the eddy viscosity with two additional PDEs, one for the turbulent kinetic energy (k) and for the dissipation ( $\varepsilon$). The model uses the one proposed by Launder and Sharma [36] https://doi.org/10.1016/0094-4548(74)90150-7.

The turbulent kinetic energy balance is:

$$\frac{\partial \left( k \right)}{\partial t} + \nabla \cdot \left( \textbf{v} k \right) - \nabla \cdot \left( \left( \nu + \frac{\nu_\text{t}}{\sigma_\text{k}} \right) \nabla k \right) - 2 \nu_\text{t} \textbf{S} \cdot \textbf{S} + \varepsilon = 0$$

.

The dissipation balance is:

$$\frac{\partial \left( \varepsilon \right)}{\partial t} + \nabla \cdot \left( \textbf{v} \varepsilon \right) - \nabla \cdot \left( \left( \nu + \frac{\nu_\text{t}}{\sigma_{\varepsilon}} \right) \nabla \varepsilon \right) - C_{1\varepsilon} \frac{\varepsilon}{k} 2 \nu_\text{t} \textbf{S} \cdot \textbf{S} + C_{2\varepsilon} \frac{\varepsilon^2}{k} = 0$$

.

The kinematic eddy viscosity $\nu_\text{t}$ is:

$$\nu_\text{t} = C_\mu \frac{k^2}{\tilde{\varepsilon}}$$

.

Finally, the model is closed with the following constants:

$$\sigma_\text{k} = 1.00$$

$$\sigma_\varepsilon =1.30$$

$$C_{1\varepsilon} = 1.44$$

$$C_{2\varepsilon} = 1.92$$

$$C_\mu = 0.09$$

Classes
struct	Dumux::Properties::KEpsilonModelTraits< dimension >
	Traits for the k-epsilon model. More...
struct	Dumux::Properties::TTag::KEpsilon
	The type tag for the single-phase, isothermal k-epsilon model. More...
struct	Dumux::Properties::ModelTraits< TypeTag, TTag::KEpsilon >
	< states some specifics of the isothermal k-epsilon model More...
struct	Dumux::Properties::FluxVariables< TypeTag, TTag::KEpsilon >
	The flux variables. More...
struct	Dumux::Properties::LocalResidual< TypeTag, TTag::KEpsilon >
	The local residual. More...
struct	Dumux::Properties::VolumeVariables< TypeTag, TTag::KEpsilon >
	Set the volume variables property. More...
struct	Dumux::Properties::IOFields< TypeTag, TTag::KEpsilon >
	The specific I/O fields. More...
struct	Dumux::Properties::TTag::KEpsilonNI
	The type tag for the single-phase, non-isothermal k-epsilon model. More...
struct	Dumux::Properties::ModelTraits< TypeTag, TTag::KEpsilonNI >
	The model traits of the non-isothermal model. More...
struct	Dumux::Properties::VolumeVariables< TypeTag, TTag::KEpsilonNI >
	Set the volume variables property. More...
struct	Dumux::Properties::IOFields< TypeTag, TTag::KEpsilonNI >
	The specific non-isothermal I/O fields. More...

Namespaces
namespace	Dumux
namespace	Dumux::Properties
namespace	Dumux::Properties::TTag
	Type tag for numeric models.

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