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The use of mixture model theory in CFD for the chemical reaction between CO2 and soda lime in closed circuit rebreather scrubbers.

Cunningham S, Burke A, Kelly G - Springerplus (2013)

Bottom Line: Analysis of mesh size, mesh type and inflation are made to independently characterize their accuracy by means of convergence before further comparisons with experimental data.The importance of mesh refinement is demonstrated near the wall with satisfactory results seen on the near grid wall of the boundary where a finer mesh is utilized.The contribution of inflation and grid independence to the accuracy of the model is presented in the results section.

View Article: PubMed Central - PubMed

Affiliation: Department of Mechanical, Medical Engineering Design and Innovation Centre (MEDIC), Biomedical and Manufacturing Engineering, Cork Institute of Technology, Cork, Ireland ; Department of Mechanical, Biomedical and Manufacturing Engineering, Cork Institute of Technology, Cork, Ireland.

ABSTRACT
A mixture model simulation is presented by modeling the axial scrubber in a Closed Circuit Rebreather (CCR). The mixture model is a good substitute for the full Eulerian multiphase model because the interphase laws are unknown in this case. Analysis of mesh size, mesh type and inflation are made to independently characterize their accuracy by means of convergence before further comparisons with experimental data. The importance of mesh refinement is demonstrated near the wall with satisfactory results seen on the near grid wall of the boundary where a finer mesh is utilized. The contribution of inflation and grid independence to the accuracy of the model is presented in the results section.

No MeSH data available.


Convergence criteria graph for the modified meshes.
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Fig6: Convergence criteria graph for the modified meshes.

Mentions: In order to attain an accurate comparison between the meshes, the same number of elements should be used. This would involve increasing the number of elements in both the hex and swept meshes to obtain convergence. Table 2 outlines the modified mesh details. When the elements are increased in both the hex and swept mesh, convergence occurs in both as illustrated in Figure 6. The results show the swept mesh is better converged than the hex and tet meshes respectively as it reaches a convergence criterion of 1e-15 and is computationally less expensive in terms of the time to reach convergence. A structured grid was therefore chosen as the optimum mesh.Table 2


The use of mixture model theory in CFD for the chemical reaction between CO2 and soda lime in closed circuit rebreather scrubbers.

Cunningham S, Burke A, Kelly G - Springerplus (2013)

Convergence criteria graph for the modified meshes.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4320243&req=5

Fig6: Convergence criteria graph for the modified meshes.
Mentions: In order to attain an accurate comparison between the meshes, the same number of elements should be used. This would involve increasing the number of elements in both the hex and swept meshes to obtain convergence. Table 2 outlines the modified mesh details. When the elements are increased in both the hex and swept mesh, convergence occurs in both as illustrated in Figure 6. The results show the swept mesh is better converged than the hex and tet meshes respectively as it reaches a convergence criterion of 1e-15 and is computationally less expensive in terms of the time to reach convergence. A structured grid was therefore chosen as the optimum mesh.Table 2

Bottom Line: Analysis of mesh size, mesh type and inflation are made to independently characterize their accuracy by means of convergence before further comparisons with experimental data.The importance of mesh refinement is demonstrated near the wall with satisfactory results seen on the near grid wall of the boundary where a finer mesh is utilized.The contribution of inflation and grid independence to the accuracy of the model is presented in the results section.

View Article: PubMed Central - PubMed

Affiliation: Department of Mechanical, Medical Engineering Design and Innovation Centre (MEDIC), Biomedical and Manufacturing Engineering, Cork Institute of Technology, Cork, Ireland ; Department of Mechanical, Biomedical and Manufacturing Engineering, Cork Institute of Technology, Cork, Ireland.

ABSTRACT
A mixture model simulation is presented by modeling the axial scrubber in a Closed Circuit Rebreather (CCR). The mixture model is a good substitute for the full Eulerian multiphase model because the interphase laws are unknown in this case. Analysis of mesh size, mesh type and inflation are made to independently characterize their accuracy by means of convergence before further comparisons with experimental data. The importance of mesh refinement is demonstrated near the wall with satisfactory results seen on the near grid wall of the boundary where a finer mesh is utilized. The contribution of inflation and grid independence to the accuracy of the model is presented in the results section.

No MeSH data available.