VelocityCoeffStationary class
Velocity equation coefficients policy yielding a statistically stationary state.
Contents
Public static functions
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static auto type() -> ctr::
CoeffPolicyType noexcept - Coefficients policy type accessor.
Constructors, destructors, conversion operators
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VelocityCoeffStationary(kw::sde_c0::info::expect::type C0_,
kw::sde_c0::info::expect::type& C0,
std::array<tk::
real, 9>& dU) - Constructor: initialize coefficients.
Public functions
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void update(char,
char,
const std::map<tk::
ctr:: Product, tk:: real>&, const tk:: Table<1>&, ctr:: DepvarType, ctr:: VelocityVariantType, kw::sde_c0::info::expect::type C0, tk:: real, tk:: real& eps, std::array<tk:: real, 9>& G) const - Update the model coefficients forcing a statistically stationary PDF.
Function documentation
walker::
Constructor: initialize coefficients.
| Parameters | |
|---|---|
| C0_ in | Value of C0 parameter in the Langevin model |
| C0 in/out | Value of to set the C0 parameter in the Langevin model |
| dU in/out | Prescribed mean velocity gradient |
Prescribe no shear. The value of C0 is insignificant for a forced stationary velocity PDF because drift and diffusion are in balance, so that dk/dt = 0.
void walker::
Update the model coefficients forcing a statistically stationary PDF.
| Parameters | |
|---|---|
| C0 in | Coefficient C0 in the Langevin model, should not affect the solution for forced velocity PDF |
| eps in/out | Dissipation rate of turbulent kinetic energy, force = 1 |
| G in/out | Coefficient tensor (3x3) in the Langevin equation |
Update the dissipation rate (eps) and G_{ij} so that the velocity PDF is stationary. The value of C0 is insignificant for a forced stationary velocity PDF because drift and diffusion are in balance, so that dk/dt = 0.