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APPENDIX 6 : SMARTFIRE CONTROL ARCHITECTURE AND BLACKBOARDSMARTFIREInterim development report on theControl Architecture and Blackboardused in the SMARTFIRE systemPURPOSE OF DOCUMENT:- Information about the newly implemented CFD blackboard architecture.- Information about access to data on the CFD blackboard.- Information about the control layer of SMARTFIRE.- List of data and control items available via the blackboard.Appendix 11.6 Page 146-1 1
APPENDIX 6 : SMARTFIRE CONTROL ARCHITECTURE AND BLACKBOARDPoints to note about usage of the blackboard:- Most of the blackboard data and control items are accessed directly. Ideally data accessshould be functional with appropriate get and set functions that would allow all of thedata to be private. This is a throwback to the nature of the original legacy code where thecontrol and status flags were all, essentially, public.- Because of the complexities of group solvers the blackboard DOES NOT maintain copiesof the group information, which would be very difficult to maintain. The groups also havethe potential to be very large and this would lead to inefficient memory usage in certaincases. Access functions have been provided that "punch" through the blackboard to therelevant data structures in SMARTFIRE. This is a temporary measure to allow researcheven as the group capabilities are being developed.- The variable class and solved variable class structures are not easily duplicated in theblackboard. It has been decided to use an alternative approach using simple arrays to storethe control and status information for individual variables. Accessing the data iscorrespondingly more awkward but the implementation is much easier. See the examplesfor details about accessing variable or solver information.- Many of the control flags are linked to other control data. For example the"use_transient" logical flag is closely linked to the values of " delta_time" and"num_of_time_steps". Consequently changes to some blackboard items cannot beeffected in isolation or unpredictable behaviour will result. This is one of the reasons whyfunctional access is so desirable.- Control must not be used to switch from a less complex state to a more complex one. Forexample the CFD code can not switch from processing as a steady state run to a transientrun if it started out as a steady state run. This is because of memory allocation andinitialisation optimisation that are tailored to the type of problem being run. Conversely itis generally and theoretically possible to switch from a more complex to a less complexprocessing state.- Similarly to above point, the code cannot create variables at run time while it isprocessing. If extra variables (e.g. turbulent quantities) are needed at a later stage of thesimulation then they must have been known when the run started (although - once created- they can be disabled until required).Appendix 11.6 Page 146-2 2
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An investigation into the feasibili
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PhD Thesis : Contents Section3.8 ST
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PhD Thesis : Contents Sectionxv
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PhD Thesis by John Ewer.analysis or
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PhD Thesis by John Ewer.computation
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PhD Thesis by John Ewer.that consti
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PhD Thesis by John Ewer.1.3.2.5 Val
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PhD Thesis by John Ewer.1.4.3 Inves
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PhD Thesis by John Ewer.A more ambi
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PhD Thesis by John Ewer.2 Backgroun
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PhD Thesis by John Ewer.The figure
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PhD Thesis by John Ewer.GUI system.
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2.4.1 Develop a new CFD engine from
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PhD Thesis by John Ewer.take consid
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PhD Thesis by John Ewer.the CFD dev
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PhD Thesis by John Ewer.nature of t
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PhD Thesis by John Ewer.availabilit
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PhD Thesis by John Ewer.operating s
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PhD Thesis by John Ewer.design. Any
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PhD Thesis by John Ewer.subsequent
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PhD Thesis by John Ewer.3.4.4 Use a
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PhD Thesis by John Ewer.3.4.9 Integ
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PhD Thesis by John Ewer.before the
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PhD Thesis by John Ewer.at the time
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PhD Thesis by John Ewer.3.6.2 Data
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PhD Thesis by John Ewer.3.6.3 Struc
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PhD Thesis by John Ewer.SUBROUTINE
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PhD Thesis by John Ewer.(1:DIMENSIO
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PhD Thesis by John Ewer.regression
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PhD Thesis by John Ewer.some instan
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PhD Thesis by John Ewer.3.7.3 Stage
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PhD Thesis by John Ewer.sometimes r
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PhD Thesis by John Ewer.limitations
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PhD Thesis by John Ewer.This corres
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PhD Thesis by John Ewer.3.7.8 Stage
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PhD Thesis by John Ewer.implementat
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PhD Thesis by John Ewer.- The legac
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PhD Thesis by John Ewer.4 Developme
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PhD Thesis by John Ewer.these benef
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PhD Thesis by John Ewer.4.2.2 HCI d
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PhD Thesis by John Ewer.4.2.3.3 Vis
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PhD Thesis by John Ewer.4.2.3.7 Cho
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PhD Thesis by John Ewer.4.3.4 Addit
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PhD Thesis by John Ewer.is a middle
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PhD Thesis by John Ewer.can be dete
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PhD Thesis by John Ewer.The validat
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PhD Thesis by John Ewer.temperature
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PhD Thesis by John Ewer.6 Research
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PhD Thesis by John Ewer.satisfactor
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PhD Thesis by John Ewer.to attempt
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PhD Thesis by John Ewer.have been k
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PhD Thesis by John Ewer.7 Prelimina
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PhD Thesis by John Ewer.The main pu
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PhD Thesis by John Ewer.The impleme
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PhD Thesis by John Ewer.Using the g
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PhD Thesis by John Ewer.fire spread
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PhD Thesis by John Ewer.FIGURE 7.2.
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PhD Thesis by John Ewer.groups and
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PhD Thesis by John Ewer.FIGURE 7.2.
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PhD Thesis by John Ewer.SOR solvers
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PhD Thesis by John Ewer.8 Conclusio
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PhD Thesis by John Ewer.that can be
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PhD Thesis by John Ewer.There is al
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PhD Thesis by John Ewer.of the perf
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PhD Thesis by John Ewer.practitione
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PhD Thesis by John Ewer.programming
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PhD Thesis by John Ewer.26. [COBALT
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PhD Thesis by John Ewer.41. [UPHAM9
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PhD Thesis by John Ewer.56. [TAYLOR
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PhD Thesis by John Ewer.70. [NETCFD
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PhD Thesis by John Ewer.11 Appendic
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APPENDIX 1 : SMARTFIRE VERIFICATION
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APPENDIX 2 : Journal Paper "Case St
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APPENDIX 3 : Conference Paper "The
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