compressible_slip_wall_process.CompressibleSlipWallProcess Class Reference

This process helps with convergence by slowly transforming an outlet into a wall. More...

Inheritance diagram for compressible_slip_wall_process.CompressibleSlipWallProcess:

Collaboration diagram for compressible_slip_wall_process.CompressibleSlipWallProcess:

Public Member Functions
def	__init__ (self, model, settings)
def	GetDefaultParameters (self)
def	Check (self)
def	ExecuteInitialize (self)
def	ExecuteInitializeSolutionStep (self)
def	ExecuteFinalizeSolutionStep (self)

Public Attributes
	interval
	model_part
	rampup_time
	rampup_enabled
	recompute_normals
	variable

Static Public Attributes
int	decay_constant = 1000
int	AWAITING = 0
int	RAMP_UP = 1
int	STEADY = 2
int	FINISHED = 3

Detailed Description

This process helps with convergence by slowly transforming an outlet into a wall.

This process has four phases:

Stages

• AWAITING: Nothing is done before the interval starts.
• RAMP_UP: The time after interval start. Duration is rampup_time. The wall lets a proportion of the fluid through.
• STEADY state: Solid free-slip wall. Lasts until the end of the interval.
• FINISHED: Nothing is done after the interval ends.

RAMP-UP

During this stage, the normal component of the momentum or velocity of the selected wall will have exponential decay. After its speed is A times smaller than originally, it extits ramp-up stage.

This parameter A is hardcoded as decay_constant.

The effect on the normal component of the momentum/velocity f, if only manipulated by this process is:

       { f0 * A^(-t/period)  if t < period (RAMP-UP)
f(t) = {
       { 0                   if t >= period (STEADY STATE)

If the momentum/velocity is being affected by any other variable, then the long-term effect is less predictable but each step the momentum/velocity is diminished by a factor of A^(-dt/period).

STEADY STATE

The node is given the SLIP flag, which signals the stategy that it is in charge of applying the boundary condition.

Key parameters

• rampup_time: Duration of the ramp-up stage.
• interval: The time in this process runs (RAMP_UP + STEADY).
• recompute_normals: Enable computing the normals every step.
• variable: The variable to control, usually MOMENTUM of VELOCITY

Constructor & Destructor Documentation

__init__()

def compressible_slip_wall_process.CompressibleSlipWallProcess.__init__	(		self,
			model,
			settings
	)

Member Function Documentation

Check()

def compressible_slip_wall_process.CompressibleSlipWallProcess.Check

(

self

)

ExecuteFinalizeSolutionStep()

def compressible_slip_wall_process.CompressibleSlipWallProcess.ExecuteFinalizeSolutionStep

(

self

)

ExecuteInitialize()

def compressible_slip_wall_process.CompressibleSlipWallProcess.ExecuteInitialize

(

self

)

ExecuteInitializeSolutionStep()

def compressible_slip_wall_process.CompressibleSlipWallProcess.ExecuteInitializeSolutionStep

(

self

)

GetDefaultParameters()

def compressible_slip_wall_process.CompressibleSlipWallProcess.GetDefaultParameters

(

self

)

Member Data Documentation

AWAITING

int compressible_slip_wall_process.CompressibleSlipWallProcess.AWAITING = 0

static

decay_constant

int compressible_slip_wall_process.CompressibleSlipWallProcess.decay_constant = 1000

static

FINISHED

int compressible_slip_wall_process.CompressibleSlipWallProcess.FINISHED = 3

static

interval

compressible_slip_wall_process.CompressibleSlipWallProcess.interval

model_part

compressible_slip_wall_process.CompressibleSlipWallProcess.model_part

RAMP_UP

int compressible_slip_wall_process.CompressibleSlipWallProcess.RAMP_UP = 1

static

rampup_enabled

compressible_slip_wall_process.CompressibleSlipWallProcess.rampup_enabled

rampup_time

compressible_slip_wall_process.CompressibleSlipWallProcess.rampup_time

recompute_normals

compressible_slip_wall_process.CompressibleSlipWallProcess.recompute_normals

STEADY

int compressible_slip_wall_process.CompressibleSlipWallProcess.STEADY = 2

static

variable

compressible_slip_wall_process.CompressibleSlipWallProcess.variable

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The documentation for this class was generated from the following file:

• /home/runner/work/Documentation/Documentation/master/applications/FluidDynamicsApplication/python_scripts/compressible_slip_wall_process.py