fluidsim.base.forcing.kolmogorov

Kolmogorov flow (fluidsim.base.forcing.kolmogorov)

class fluidsim.base.forcing.kolmogorov.KolmogorovFlow(sim)

Bases: _KolmogorovFlowBase, SpecificForcingPseudoSpectralSimple

Kolmogorov flow forcing

This forcing can be used with solvers based on ns2d or ns3d.

By default, the flow is forced along the x axis with a gradient along the z axis for 3D solvers and the y axis for the 2D solvers.

Examples

from fluidsim.solvers.ns3d.solver import Simul as SimulNotExtended

from fluidsim.base.forcing.kolmogorov import extend_simul_class, KolmogorovFlow

Simul = extend_simul_class(SimulNotExtended, KolmogorovFlow)

params = Simul.create_default_params()

params.forcing.enable = True
params.forcing.type = "kolmogorov_flow"

The parameters can be modified as follow:

params.forcing.kolmo.ik = 3
params.forcing.kolmo.amplitude = 2.0

params.forcing.key_forced = "ux_fft"
params.forcing.kolmo.letter_gradient = "y"

compute()

compute the forcing.

class fluidsim.base.forcing.kolmogorov.KolmogorovFlowNormalized(sim)

Bases: _KolmogorovFlowBase, NormalizedForcing

Kolmogorov flow forcing with constant energy injection rate

This forcing can be used with solvers based on ns2d or ns3d.

By default, the flow is forced along the x axis with a gradient along the z axis for 3D solvers and the y axis for the 2D solvers.

Examples

from fluidsim.solvers.ns3d.solver import Simul as SimulNotExtended

from fluidsim.base.forcing.kolmogorov import extend_simul_class, KolmogorovFlowNormalized

Simul = extend_simul_class(SimulNotExtended, KolmogorovFlowNormalized)

params = Simul.create_default_params()

params.forcing.enable = True
params.forcing.type = "kolmogorov_flow_normalized"

The parameters can be modified as follow:

params.forcing.kolmo.ik = 3
params.forcing.forcing_rate = 10.0

Note that params.forcing.kolmo.amplitude has no effect for this forcing type.

Classes

KolmogorovFlow(sim)	Kolmogorov flow forcing
KolmogorovFlowNormalized(sim)	Kolmogorov flow forcing with constant energy injection rate