Worked examples: Difference between revisions
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This is a list of worked example models that were written in the spirit of experimentation while working on the functionality of ASCEND. | This is a list of worked example models that were written in the spirit of experimentation while working on the functionality of ASCEND. | ||
See also [[Category:Tutorials]] and [[Category:Examples]]. | See also [[:Category:Tutorials]] and [[:Category:Examples]]. | ||
== Steam power station == | |||
ASCEND can model complete [[Rankine cycle|Rankine power cycles]] including regeneration and reheat. The same models work for a variety of fluids via [[FPROPS]]. See {{src|models/johnpye/fprops/rankine_fprops.a4c}}. | |||
Note that the diagram below was created with Dia; we are working on a [[canvas-based modeller for ASCEND]] but it's still in early stages of development. | |||
[[Image:RankineRegenReheat.png|400px]] [[Image:Rankine-Ts.png|400px]] | |||
== Four bar linkage == | == Four bar linkage == | ||
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This example shows a (static) system with simple geometric constraints. It is solved for a range of angles for one member, and the position of the other members is determined. Then a nice plot is built up by repeated running the ASCEND model and accumulating the results using [[ExtPy]]. | This example shows a (static) system with simple geometric constraints. It is solved for a range of angles for one member, and the position of the other members is determined. Then a nice plot is built up by repeated running the ASCEND model and accumulating the results using [[ExtPy]]. | ||
[[Image:Fourbar.png|thumb|402px]] | [[Image:Fourbar.png|thumb|402px|none]] | ||
== Thermal equilibrium == | == Thermal equilibrium == | ||
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This is a simple model of thermal equilibrium between two masses of steam with a simple constant heat transfer coefficient between them. The model uses external [[freesteam]] IAPWS-IF97 steam tables and the [[IDA]] integrator. | This is a simple model of thermal equilibrium between two masses of steam with a simple constant heat transfer coefficient between them. The model uses external [[freesteam]] IAPWS-IF97 steam tables and the [[IDA]] integrator. | ||
[[Image:Thermalequilibrium.png|thumb|400px|none|Graph of the temperatures of the two masses over time. The transition through the saturation region is visible.]] | |||
== Simple advection equation == | == Simple advection equation == | ||
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This model is a study of the simple advection equation, following [http://dx.doi.org/10.1177/003754977803100205 a discussion] published by Carver and Hinds in ''Simulation'' (1978). Just as with the explicit integration method discussed in that paper, we also see instability when using the [[IDA]] implicit BDF integrator here. The output in each case was generated by copying the contents of the Integrator tab and pasting into OpenOffice and plotting there. | This model is a study of the simple advection equation, following [http://dx.doi.org/10.1177/003754977803100205 a discussion] published by Carver and Hinds in ''Simulation'' (1978). Just as with the explicit integration method discussed in that paper, we also see instability when using the [[IDA]] implicit BDF integrator here. The output in each case was generated by copying the contents of the Integrator tab and pasting into OpenOffice and plotting there. | ||
[[Image:2p-upwind.png]][[Image:3p-upwind.png]] | [[Image:2p-upwind.png|200px]][[Image:3p-upwind.png|200px]] | ||
[[Image:4p-biased.png]][[Image:Central-diff.png]] | [[Image:4p-biased.png|200px]][[Image:Central-diff.png|200px]] | ||
== More examples == | == More examples == | ||
For some more detailed examples, see the page [[Category:Examples]], which includes: | For some more detailed examples, see the page [[Category:Examples]], which includes: | ||
* [[Vapor-liquid equilibrium]] | * [[Vapor-liquid equilibrium]] | ||
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* [[Conditional modelling]] (examples of models with IF/ELSE-style behaviour in their equations) | * [[Conditional modelling]] (examples of models with IF/ELSE-style behaviour in their equations) | ||
* [[Optimisation of frame geometry]] | * [[Optimisation of frame geometry]] | ||
* [http:// | * [http://chetoolbox.uah.edu/courseware/toolbox/ascend/ Chemical thermodynamics, mass/energy balance] and more, from [[User:Kchittur|Krishnan Chittur]]. | ||
* [[Combined-cycle gas turbine]] | |||
[[Category:Documentation]] | |||
[[Category:Examples]] | [[Category:Examples]] | ||
Latest revision as of 01:42, 26 November 2017
This is a list of worked example models that were written in the spirit of experimentation while working on the functionality of ASCEND.
See also Category:Tutorials and Category:Examples.
Steam power station
ASCEND can model complete Rankine power cycles including regeneration and reheat. The same models work for a variety of fluids via FPROPS. See models/johnpye/fprops/rankine_fprops.a4c.
Note that the diagram below was created with Dia; we are working on a canvas-based modeller for ASCEND but it's still in early stages of development.
Four bar linkage
This example shows a (static) system with simple geometric constraints. It is solved for a range of angles for one member, and the position of the other members is determined. Then a nice plot is built up by repeated running the ASCEND model and accumulating the results using ExtPy.
Thermal equilibrium
models/johnpye/thermalequilibrium2.a4c
This is a simple model of thermal equilibrium between two masses of steam with a simple constant heat transfer coefficient between them. The model uses external freesteam IAPWS-IF97 steam tables and the IDA integrator.
Simple advection equation
This model is a study of the simple advection equation, following a discussion published by Carver and Hinds in Simulation (1978). Just as with the explicit integration method discussed in that paper, we also see instability when using the IDA implicit BDF integrator here. The output in each case was generated by copying the contents of the Integrator tab and pasting into OpenOffice and plotting there.
More examples
For some more detailed examples, see the page , which includes:
- Vapor-liquid equilibrium
- Calculation of sun position
- Damped response
- Conditional modelling (examples of models with IF/ELSE-style behaviour in their equations)
- Optimisation of frame geometry
- Chemical thermodynamics, mass/energy balance and more, from Krishnan Chittur.
- Combined-cycle gas turbine