esys.modellib.flow.SteadyIncompressibleFlow

Package esys :: Package modellib :: Module flow :: Class SteadyIncompressibleFlow

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Type SteadyIncompressibleFlow

    object --+            
             |            
LinkableObject --+        
                 |        
      ParameterSet --+    
                     |    
                 Model --+
                         |
                        SteadyIncompressibleFlow

-\left(\eta\left(v_{i,j}+v_{j,i} ight) ight)_{,j}+p_{,i}=F_i

\sigma_{ij}=2\eta D_{ij}-p\,\delta_{ij}

D_{ij}= rac{1}{2}\left( v_{j,i} + v_{i,j } ight)

v_{k,k} = 0

Method Summary
	`__init__(self, debug)` set up model
	`doInitialization(self)` initialize model
	`doStep(self, dt)` performs an iteration step of the penalty method.
	`doStepPostprocessing(self, dt)` Finalalizes the time step.
	`doStepPreprocessing(self, dt)` step up pressure iteration
	`stress(self)` returns current stress
	`stretching(self)` returns stertching tensor
	`terminateIteration(self)` iteration is terminateIterationd if relative pressure change is less then rel_tol
Inherited from Model
	`__str__(self)`
	`doFinalization(self)` Finalizes the time stepping.
	`finalize(self)` Returns False if the time stepping is finalized.
	`getSafeTimeStepSize(self, dt)` Returns a time step size which can safely be used.
	`toDom(self, document, node)` `toDom` method of Model class
	`writeXML(self, ostream)` Writes the object as an XML object into an output stream.
Inherited from ParameterSet
	`__delattr__(self, name)` Removes the attribute name.
	`__iter__(self)` Creates an iterator over the parameter and their values.
	`__repr__(self)`
	`declareParameter(self, **parameters)` Declares a new parameter(s) and its (their) initial value.
	`declareParameters(self, parameters)` Declares a set of parameters.
	`fromDom(cls, doc)` (Class method)
	`releaseParameters(self, name)` Removes parameter name from the paramameters.
	`showParameters(self)` Returns a descrition of the parameters.
Inherited from LinkableObject
	`__getattr__(self, name)` Returns the value of attribute name.
	`__setattr__(self, name, value)` Sets the value for attribute name.
	`getAttributeObject(self, name)` Return the object stored for attribute name.
	`hasAttribute(self, name)` Returns True if self as attribute name.
	`trace(self, msg)` If debugging is on, print the message, otherwise do nothing
Inherited from object
	`__getattribute__(...)` x.__getattribute__('name') <==> x.name
	`__hash__(x)` x.__hash__() <==> hash(x)
	`__new__(T, S, ...)` T.__new__(S, ...) -> a new object with type S, a subtype of T
	`__reduce__(...)` helper for pickle
	`__reduce_ex__(...)` helper for pickle

Class Variable Summary
Inherited from Model
`float`	`UNDEF_DT` = 1.0000000000000001e+300
Inherited from LinkableObject
`count`	`number_sequence` = `<itertools.count object at 0x401ff100>`

Instance Method Details

init(self, debug=False)
(Constructor)

set up model

Overrides:: esys.escript.modelframe.Model.__init__

doInitialization(self)

initialize model

Overrides:: esys.escript.modelframe.Model.doInitialization

doStep(self, dt)

performs an iteration step of the penalty method. IterationDivergenceError is raised if pressure error cannot be reduced or max_iter is reached.

Overrides:: esys.escript.modelframe.Model.doStep

doStepPostprocessing(self, dt)

Finalalizes the time step.

dt is the currently used time step size.

This function may be overwritten.

Overrides:: esys.escript.modelframe.Model.doStepPostprocessing (inherited documentation)

doStepPreprocessing(self, dt)

step up pressure iteration

if run within a time dependend problem extrapolation of pressure from previous time steps is used to get an initial guess (that needs some work!!!!!!!)

Overrides:: esys.escript.modelframe.Model.doStepPreprocessing

stress(self)

returns current stress

stretching(self)

returns stertching tensor

terminateIteration(self)

iteration is terminateIterationd if relative pressure change is less then rel_tol

Overrides:: esys.escript.modelframe.Model.terminateIteration

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