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hydrogym.firedrake.envs.cylinder.flow

CylinderBase Objects​

class CylinderBase(FlowConfig)

TAU​

Time constant for controller damping (0.01*vortex shedding period)

cyl_velocity_field​

@property
def cyl_velocity_field()

Velocity vector for boundary condition

compute_forces​

def compute_forces(q: fd.Function = None) -> tuple[float]

Compute dimensionless lift/drag coefficients on cylinder

Arguments:

q (fd.Function, optional): Flow state to compute shear force from, if not the current state.

Returns:

  • Iterable[float] - Tuple of (lift, drag) coefficients

shear_force​

def shear_force(q: fd.Function = None) -> float

Net shear force acting tangentially to the cylinder surface

Implements the general case of the article below: http://www.homepages.ucl.ac.uk/~uceseug/Fluids2/Notes_Viscosity.pdf

Arguments:

q (fd.Function, optional): Flow state to compute shear force from, if not the current state.

Returns:

  • float - Tangential shear force

evaluate_objective​

def evaluate_objective(q: fd.Function = None) -> float

The objective function for this flow is the drag coefficient

Cylinder Objects​

class Cylinder(CylinderBase)

cyl_velocity_field​

@property
def cyl_velocity_field()

Velocity vector for boundary condition

Blowing/suction actuation on the cylinder wall, following Rabault, et al (2018) https://arxiv.org/abs/1808.07664