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Article overview
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Scale-Bridging Model Development for Coal Particle Devolatilization | | Benjamin B Schroeder
; Sean T Smith
; Philip J Smith
; Thomas H Fletcher
; Andrew Packard
; Michael Frenklach
; Arun Hegde
; Wenyu Li
; James Oreluk
; | | Date: |
4 Sep 2016 | | Abstract: | When performing large-scale, high-performance computations of multi-physics
applications, it is common to limit the complexity of physics sub-models
comprising the simulation. For a hierarchical system of coal boiler simulations
a scale-bridging model is constructed to capture characteristics appropriate
for the application-scale from a detailed coal devolatilization model. Such
scale-bridging allows full descriptions of scale-applicable physics, while
functioning at reasonable computational costs. This study presents a variation
on multi-fidelity modeling with a detailed physics model, the chemical
percolation devolatilization model, being used to calibrate a scale-briding
model for the application of interest. The application space provides essential
context for designing the scale-bridging model by defining scales, determining
requirements and weighting desired characteristics. A single kinetic reaction
equation with functional yield model and distributed activation energy is
implemented to act as the scale-bridging model-form. Consistency constraints
are used to locate regions of the scale-bridging model’s parameter-space that
are consistent with the uncertainty identified within the detailed model.
Ultimately, the performance of the scale-bridging model with consistent
parameter-sets was assessed against desired characteristics of the detailed
model and found to perform satisfactorily in capturing thermodynamic trends and
kinetic timescales for the desired application-scale. Framing the process of
model-form selection within the context of calibration and uncertainty
quantification allows the credibility of the model to be established. | | Source: | arXiv, 1609.0871 | | Services: | Forum | Review | PDF | Favorites | |
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