Download pdf - OpenMI Developers Training

Jan Gregersen 1

Jan Gregersen

http://www.LicTek.com

OpenMI Developers Training

Jan Gregersen 2

Simple River

5 10

X (km)

Y (km)

5

10 Node:0

Node:1

Node:2

Node:3

Branch:0

Branch:1

Branch:2

Y (km) 5 10

X (km)

5

10

Runoff Model Simple River

OutputExchangeItem InputExchangeItem

Quantity ID : Runoff

DataOperaiton : Distributed

ElementSet : Polygons

Quantity ID : Inflow

ElementSet : Polyline

Jan Gregersen 3

How it works

Load components:

Query exchange items:

Add links:

Jan Gregersen 4

How it works

Prepare:

Run (GetValues):

Finish:

DHI - Water & Environment Jan Gregersen

The OpenMI standard

Jan Gregersen 6

DHI - Water & Environment Jan Gregersen

Migration of models

Jan Gregersen 8

Now What ???

Jan Gregersen 9

Org.OpenMI.Utilities

Org.OpenMI.Utilities.Spatial

Org.OpenMI.Utilities.Buffer

Org.OpenMI.Utilities.Wrapper

Buffers results from the engine core

Mapping of values associated to one array of times /timespans to values represented on another array of times/timespans

t t

Mapping of values associated to one ElementSet to be represented on another ElementSet

SmartBuffer

ElementMapper

SmartWrapper

Generic wrapper suited for time stepping model engines

Jan Gregersen 10

LinkableEngine features

• Provides a default implementation of the ILinkableComponent interface

• Links bookkeeping

• Event handling

• Buffering

• Temporal interpolations, aggregations,extrapolations

• Spatial interpolations, aggregations,extrapolations

Jan Gregersen 11

Wrapper design pattern

Jan Gregersen 12

IEngine Interface

// -- Execution control methods (Inherited from IRunEngine) --

void Initialize(Hashtable properties);

bool PerformTimeStep();

void Finish();

//-- Time methods (Inherited from IRunEngine) --

ITime GetCurrentTime();

ITime GetInputTime(string QuantityID, string ElementSetID);

ITimeStamp GetEarliestNeededTime();

//-- Data access methods (Inherited from IRunEngine) --

void SetValues(string QuantityID, string ElementSetID, IValueSet values);

IValueSet GetValues(string QuantityID, string ElementSetID);

//-- Component description methods (Inherited from IRunEngine) --

double GetMissingValueDefinition();

string GetComponentID();

string GetComponentDescription();

// -- Model description methods --

string GetModelID();

string GetModelDescription();

double GetTimeHorizon();

// -- Exchange items --

int GetInputExchangeItemCount();

int GetOutputExchangeItemCount();

org.OpenMI.Backbone GetInputExchangeItem(int exchangeItemIndex);

org.OpenMI.Backbone GetOutputExchangeItem(int exchangeItemIndex);

Jan Gregersen 13

Inside the LinkableEngine

SmartWrapper

SmartInputLinkSet SmartOutputLinkSet

SmartInputLink

UpdateBuffer()GetValues()

UpdateInput()

SmartOutputLink

UpdateInput() UpdateBuffer()GetValues()

Link

SmartBuffer ElementMapper

*

1

*

1

has has

hashas

has

has

Link

access

access

Jan Gregersen 14

GetValues()

Model B Model A

GetValues(time, LinkID)

1. Update with input from linked models

2. Perform time step and fill internal buffers

3. Map values in time and space

Return values

While (CurrentTime < time & State is “Not Busy”)


Jan Gregersen 15

GetValues()

Model B Model A





Return values



Jan Gregersen 16

GetValues()

Model B Model AEngine

AIPAccess

SmartOutputLInkSet

A SmartBuffer

AElementMapper

A SmartOutput

LInk

SmartInputLink

Set

GetValues(tl LinkID)

GetCurrentTime()

IsBusy = true

A SmartInputLink

UpdateInput(ct)

UpdateInput(ct)

GetValues(ct,LinkID)

SetValues(Quantity,LocationID,Values)

For each Input Link

Jan Gregersen 17

GetValues()

Model B Model A





Return values



Jan Gregersen 18

GetValues()


AIPAccess

SmartOutputLInkSet

A SmartBuffer

AElementMapper

A SmartOutput

LInk

SmartInputLink

Set

PerformTimeStep()

A SmartInputLink

UpdateBuffers()

UpdateBuffer()

Getvalues(Quantity,LocationIDs)

Addvalues(time, valueSet)

For each output link

IsBusy = false

Jan Gregersen 19

GetValues()

Model B Model A





Return values



Jan Gregersen 20

GetValues()


AIPAccess

SmartOutputLInkSet

A SmartBuffer

AElementMapper

A SmartOutput

LInk

SmartInputLink

Set


A SmartInputLink

GetValues(time)

GetValues(time)

MapValues(inpuValues)

Jan Gregersen 21

IEngine Interface

// -- Execution control methods (Inherited from IRunEngine) --

void Initialize(Hashtable properties);

bool PerformTimeStep();

void Finish();

//-- Time methods (Inherited from IRunEngine) --

ITime GetCurrentTime();

ITime GetInputTime(string QuantityID, string ElementSetID);

ITimeStamp GetEarliestNeededTime();

//-- Data access methods (Inherited from IRunEngine) --

void SetValues(string QuantityID, string ElementSetID, IValueSet values);

IValueSet GetValues(string QuantityID, string ElementSetID);

//-- Component description methods (Inherited from IRunEngine) --

double GetMissingValueDefinition();

string GetComponentID();

string GetComponentDescription();

// -- Model description methods --

string GetModelID();

string GetModelDescription();

double GetTimeHorizon();

// -- Exchange items --

int GetInputExchangeItemCount();

int GetOutputExchangeItemCount();

org.OpenMI.Backbone GetInputExchangeItem(int exchangeItemIndex);

org.OpenMI.Backbone GetOutputExchangeItem(int exchangeItemIndex);

Jan Gregersen 22


Jan Gregersen 23

Migration steps

• Change your engine to a dll

• Implement Initialize, PerformTimeStep and Finish

• Create the EngineDllWrapper class

Jan Gregersen 24


Jan Gregersen 25

Migration steps

• Create your MyEnigneWrapper

• Implement Initialize and Finish

• Implement remaining Ienigne methods

Jan Gregersen 26

Jan Gregersen 27

The ElementMapper

Ground water

Model

River Model

GetValues(time, link)

CalculateReturn values

Link

ElementSetQuantity

“GW Recharge”

Has Has

Jan Gregersen 28

Spatial mapping

Jan Gregersen 29

ElementMapper

Org.OpenMI.Utilties.Spatial

ElementMapper

Initialise(string methodDescription, IElementSet fromElements, IElementSet toElements)IValueSet MapValues(IValueSet inputValues)

nmnmmm

n

n

n

m x

x

x

x

mmmm

mmmm

mmmm

mmmm

r

r

r

r

.

.

.....

.

.

.

.

3

2

1

321

3333231

2232221

1131211

3

2

1

Jan Gregersen 30

Element Mapping

GE1GE2

GE3GE4

RE1

RE1

RE3

2/100

000

2/13/20

03/11

A

ALI

Element

• ID Based

• Point

• Line

• Polyline

• Polygon

“Node127”

(x1,y1)

(x1,y1) (x2,y2)

(x1,y1) (x2,y2) (x3,y3) (x4,y4)

(x1,y1)

(x2,y2)

(x3,y3)

(x4,y4)

(x5,y5)

ElementSet example

H

H

HH

H

H

H

H

H

H

H

HQ

Q

Q

Q

Q

Q

Q

Q

Q

Q

Q

Quantity

• ID ( “Runoff” )

• Description ( “Rainfall runoff” )

• Dimension ( e.g. L3 T-1 )– GetPower ( <dimensionBase> )

• Unit:– ID ( “CFS” )

– Descr ( “Cubic feet per second “ )

– ConversionFactorToSI ( 0,0283168439 )

– OffsetToSI ( 0 )

ExchangeItem

• InputExchangeItem

– Quantity

– ElementSet

• OutputExchangeItem

– Quantity

– ElementSet

– [ DataOperations

• ID

• Arguments ]

Unidirectional link

{while RMtime < t1}

{while RRtime < RMtime + _dt}

«interface»

RRmodel :

ILinkableComponent

«interface»

RiverModel :

ILinkableComponentMainProgram

[1]

[2]

[3]

GetValues(time=t1, linkID=TriggerLink)

GetValues(time=RMtime + _dt, linkID=RRtoRiver)

PerformTimeStep

return ValueSet: Runoff

PerformTimeStep

return ValueSet: RiverFlow

Bidirectional links

MainProgram

«interface»

RiverModel :

ILinkableComponent

«interface»

GroundWaterModel :

ILinkableComponent

RiverModel uses time step t1, GroundwaterModel uses time step t2

[2]

[3]

[6]

[7]

[1]

[4]

[5]

GetValues(t2,TriggerLink)

GetValues(time=t1, linkID=QtoRiver)

GetValues(time=t2, linkID=HtoGW)

Extrapolate (t2)

return extrapolated ValueSet: HtoGW (t2)

PerformTimeStep (t2)

return interpolated ValueSet QtoRiver (t1)


GetValues(time=t2, linkID=QtoRiver)

return ValueSet QtoRiver (t2)


return ValueSet Hriver (t2)

{unti l l QtoGW is stabi l ized}

«interface»

GroundWaterModel :

ILinkableComponent

«interface»

RiverModel :

ILinkableComponent

IterationControl ler

:

ILinkableComponentMainProgram

[1]

[2]

[3]

[4]

[5]

[6]

[7]

GetValues(time=t2, l inkID=H_SW)

KeepCurrentState

RiverState_t_begin

KeepCurrentState

GWState_t_begin

InitialGuess(QtoGW)

RestoreState(RiverState_t_begin)

RestoreState(GWState_t_begin)

GetValues(time=t2, l inkID=H_GW)

GetValues(time=t2, l inkID=QtoGW)

QtoGW_guess

H_GW

GetValues(time=t2, l inkID=H_SW)

GetValues(time=t2, l inkID=QtoGW)

QtoGW_guess

H_SW

Evaluate

NewGuess(QtoGW)

result: H_SW

{until RRtime=t1}

User

MainProgram

:

IListener

«interface»

RR model :

ILinkableComponent

«interface»

RiverModel :

ILinkableComponent

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

Start

GetValues(time=t1,TriggerLinkID)

OnEvent(SourceAfterGetValuesCall)

return computation thread

GetValues(time=t1,linkID=QtoRiver)

OnEvent(SourceAfterGetValuesCall)


PerformTimeStep((_dt))

OnEvent(DataChanged)


OnEvent(SourceBeforeGetValuesReturn)Pause

Resume


return ValueSet(QtoRiver, t1)

OnEvent(TargetAfterGetValuesReturn)


PerformTimeStep(RM_dt)

OnEvent(DataChanged)

OnEvent(SourceBeforeGetValuesReturn)

return computation thead

return ValueSet(t1)

Persistency

• OMI File

– For identifying a linkable component

• Composition

– In org.OpenMI.Utilities.Configuration

– Holds administration of links and linkable components

– Can be run

– Can be written and read to / from xml

Exercise 9:Unit Conversion

Step 1

Open the DataCombinator

Step 2

Adjust the code of GetValues so that it delivers data in the right unit

Step 3

Adjust the test program to ask for a quantity which has a conversion factor not equal to one

Step 4

Identify a value as missing value (e.g. -999) and adjust the input. Make sure this value is processed correctly.

Step 5

Test the program using NUnit